[PATCH 0/6] kcore clean up and enhance

[PATCH 0/6] kcore clean up and enhance

[KAMEZAWA Hiroyuki]

This patch set is for /proc/kcore. By this,

 - many per-arch hooks are removed.

 - /proc/kcore will know really valid physical memory area.

 - /proc/kcore will be aware of memory hotplug.

 - /proc/kcore will be architecture independent i.e.
   if an arch supports CONFIG_MMU, it can use /proc/kcore.
   (if the arch uses usual memory layout.)

BTW, I'll be on small trip from Aug/11 to Aug/17. So, my rtt may be
bad in the next week.

Thanks,
-Kame

[PATCH 1/6] kcore: use usual list for kclist

[KAMEZAWA Hiroyuki]

From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

/proc/kcore uses its own list handling codes. It's better to use
generic list codes.

No changes in logic. just clean up.

Changelog v2->v3
 - adjusted to mmotm-Aug-6. (it includes kcore-vread fix.)

Changelog v1->v2
 - no changes.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
 fs/proc/kcore.c         |   12 ++++++------
 include/linux/proc_fs.h |    2 +-
 2 files changed, 7 insertions(+), 7 deletions(-)

Index: mmotm-2.6.31-Aug6/fs/proc/kcore.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/fs/proc/kcore.c
+++ mmotm-2.6.31-Aug6/fs/proc/kcore.c
@@ -20,6 +20,7 @@
 #include <linux/init.h>
 #include <asm/uaccess.h>
 #include <asm/io.h>
+#include <linux/list.h>
 
 #define CORE_STR "CORE"
 
@@ -57,7 +58,7 @@ struct memelfnote
 	void *data;
 };
 
-static struct kcore_list *kclist;
+static LIST_HEAD(kclist_head);
 static DEFINE_RWLOCK(kclist_lock);
 
 void
@@ -67,8 +68,7 @@ kclist_add(struct kcore_list *new, void 
 	new->size = size;
 
 	write_lock(&kclist_lock);
-	new->next = kclist;
-	kclist = new;
+	list_add_tail(&new->list, &kclist_head);
 	write_unlock(&kclist_lock);
 }
 
@@ -80,7 +80,7 @@ static size_t get_kcore_size(int *nphdr,
 	*nphdr = 1; /* PT_NOTE */
 	size = 0;
 
-	for (m=kclist; m; m=m->next) {
+	list_for_each_entry(m, &kclist_head, list) {
 		try = kc_vaddr_to_offset((size_t)m->addr + m->size);
 		if (try > size)
 			size = try;
@@ -192,7 +192,7 @@ static void elf_kcore_store_hdr(char *bu
 	nhdr->p_align	= 0;
 
 	/* setup ELF PT_LOAD program header for every area */
-	for (m=kclist; m; m=m->next) {
+	list_for_each_entry(m, &kclist_head, list) {
 		phdr = (struct elf_phdr *) bufp;
 		bufp += sizeof(struct elf_phdr);
 		offset += sizeof(struct elf_phdr);
@@ -317,7 +317,7 @@ read_kcore(struct file *file, char __use
 		struct kcore_list *m;
 
 		read_lock(&kclist_lock);
-		for (m=kclist; m; m=m->next) {
+		list_for_each_entry(m, &kclist_head, list) {
 			if (start >= m->addr && start < (m->addr+m->size))
 				break;
 		}
Index: mmotm-2.6.31-Aug6/include/linux/proc_fs.h
===================================================================
--- mmotm-2.6.31-Aug6.orig/include/linux/proc_fs.h
+++ mmotm-2.6.31-Aug6/include/linux/proc_fs.h
@@ -79,7 +79,7 @@ struct proc_dir_entry {
 };
 
 struct kcore_list {
-	struct kcore_list *next;
+	struct list_head list;
 	unsigned long addr;
 	size_t size;
 };

[PATCH 2/6] kcore: add kclist type

[KAMEZAWA Hiroyuki]

From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

Now, kclist_add() only eats start address and size as its arguments.
Considering to make kclist dynamically reconfigulable, it's necessary
to know which kclists are for System RAM and whic is not.

This patch add kclist types as
  KCORE_RAM
  KCORE_VMALLOC
  KCORE_TEXT
  KCORE_OTHER

This "type" is used in a patch follow this for detecting KCORE_RAM.

Chnagelog v1->v2
 - no changes.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
 arch/ia64/mm/init.c       |    7 ++++---
 arch/mips/mm/init.c       |    7 ++++---
 arch/powerpc/mm/init_32.c |    4 ++--
 arch/powerpc/mm/init_64.c |    5 +++--
 arch/sh/mm/init.c         |    4 ++--
 arch/x86/mm/init_32.c     |    4 ++--
 arch/x86/mm/init_64.c     |   11 ++++++-----
 fs/proc/kcore.c           |    3 ++-
 include/linux/proc_fs.h   |   13 +++++++++++--
 9 files changed, 36 insertions(+), 22 deletions(-)

Index: mmotm-2.6.31-Aug6/include/linux/proc_fs.h
===================================================================
--- mmotm-2.6.31-Aug6.orig/include/linux/proc_fs.h
+++ mmotm-2.6.31-Aug6/include/linux/proc_fs.h
@@ -78,10 +78,18 @@ struct proc_dir_entry {
 	struct list_head pde_openers;	/* who did ->open, but not ->release */
 };
 
+enum kcore_type {
+	KCORE_TEXT,
+	KCORE_VMALLOC,
+	KCORE_RAM,
+	KCORE_OTHER,
+};
+
 struct kcore_list {
 	struct list_head list;
 	unsigned long addr;
 	size_t size;
+	int type;
 };
 
 struct vmcore {
@@ -233,11 +241,12 @@ static inline void dup_mm_exe_file(struc
 #endif /* CONFIG_PROC_FS */
 
 #if !defined(CONFIG_PROC_KCORE)
-static inline void kclist_add(struct kcore_list *new, void *addr, size_t size)
+static inline void
+kclist_add(struct kcore_list *new, void *addr, size_t size, int type)
 {
 }
 #else
-extern void kclist_add(struct kcore_list *, void *, size_t);
+extern void kclist_add(struct kcore_list *, void *, size_t, int type);
 #endif
 
 union proc_op {
Index: mmotm-2.6.31-Aug6/arch/ia64/mm/init.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/ia64/mm/init.c
+++ mmotm-2.6.31-Aug6/arch/ia64/mm/init.c
@@ -639,9 +639,10 @@ mem_init (void)
 
 	high_memory = __va(max_low_pfn * PAGE_SIZE);
 
-	kclist_add(&kcore_mem, __va(0), max_low_pfn * PAGE_SIZE);
-	kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
-	kclist_add(&kcore_kernel, _stext, _end - _stext);
+	kclist_add(&kcore_mem, __va(0), max_low_pfn * PAGE_SIZE, KCORE_RAM);
+	kclist_add(&kcore_vmem, (void *)VMALLOC_START,
+			VMALLOC_END-VMALLOC_START, KCORE_VMALLOC);
+	kclist_add(&kcore_kernel, _stext, _end - _stext, KCORE_TEXT);
 
 	for_each_online_pgdat(pgdat)
 		if (pgdat->bdata->node_bootmem_map)
Index: mmotm-2.6.31-Aug6/arch/mips/mm/init.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/mips/mm/init.c
+++ mmotm-2.6.31-Aug6/arch/mips/mm/init.c
@@ -409,11 +409,12 @@ void __init mem_init(void)
 	if ((unsigned long) &_text > (unsigned long) CKSEG0)
 		/* The -4 is a hack so that user tools don't have to handle
 		   the overflow.  */
-		kclist_add(&kcore_kseg0, (void *) CKSEG0, 0x80000000 - 4);
+		kclist_add(&kcore_kseg0, (void *) CKSEG0,
+				0x80000000 - 4, KCORE_TEXT);
 #endif
-	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
+	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT, KCORE_RAM);
 	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
-		   VMALLOC_END-VMALLOC_START);
+		   VMALLOC_END-VMALLOC_START, KCORE_VMALLOC);
 
 	printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
 	       "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
Index: mmotm-2.6.31-Aug6/arch/powerpc/mm/init_32.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/powerpc/mm/init_32.c
+++ mmotm-2.6.31-Aug6/arch/powerpc/mm/init_32.c
@@ -268,11 +268,11 @@ static int __init setup_kcore(void)
 						size);
 		}
 
-		kclist_add(kcore_mem, __va(base), size);
+		kclist_add(kcore_mem, __va(base), size, KCORE_RAM);
 	}
 
 	kclist_add(&kcore_vmem, (void *)VMALLOC_START,
-		VMALLOC_END-VMALLOC_START);
+		VMALLOC_END-VMALLOC_START, KCORE_VMALLOC);
 
 	return 0;
 }
Index: mmotm-2.6.31-Aug6/arch/powerpc/mm/init_64.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/powerpc/mm/init_64.c
+++ mmotm-2.6.31-Aug6/arch/powerpc/mm/init_64.c
@@ -128,10 +128,11 @@ static int __init setup_kcore(void)
 		if (!kcore_mem)
 			panic("%s: kmalloc failed\n", __func__);
 
-		kclist_add(kcore_mem, __va(base), size);
+		kclist_add(kcore_mem, __va(base), size, KCORE_RAM);
 	}
 
-	kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
+	kclist_add(&kcore_vmem, (void *)VMALLOC_START,
+		VMALLOC_END-VMALLOC_START, KCORE_VMALLOC);
 
 	return 0;
 }
Index: mmotm-2.6.31-Aug6/arch/sh/mm/init.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/sh/mm/init.c
+++ mmotm-2.6.31-Aug6/arch/sh/mm/init.c
@@ -218,9 +218,9 @@ void __init mem_init(void)
 	datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
 	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 
-	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
+	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT, KCORE_RAM);
 	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
-		   VMALLOC_END - VMALLOC_START);
+		   VMALLOC_END - VMALLOC_START, KCORE_VMALLOC);
 
 	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
 	       "%dk data, %dk init)\n",
Index: mmotm-2.6.31-Aug6/arch/x86/mm/init_32.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/x86/mm/init_32.c
+++ mmotm-2.6.31-Aug6/arch/x86/mm/init_32.c
@@ -886,9 +886,9 @@ void __init mem_init(void)
 	datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
 	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 
-	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
+	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT, KCORE_RAM);
 	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
-		   VMALLOC_END-VMALLOC_START);
+		   VMALLOC_END-VMALLOC_START, KCORE_VMALLOC);
 
 	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
 			"%dk reserved, %dk data, %dk init, %ldk highmem)\n",
Index: mmotm-2.6.31-Aug6/arch/x86/mm/init_64.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/x86/mm/init_64.c
+++ mmotm-2.6.31-Aug6/arch/x86/mm/init_64.c
@@ -677,13 +677,14 @@ void __init mem_init(void)
 	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 
 	/* Register memory areas for /proc/kcore */
-	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
+	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT, KCORE_RAM);
 	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
-		   VMALLOC_END-VMALLOC_START);
-	kclist_add(&kcore_kernel, &_stext, _end - _stext);
-	kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN);
+		   VMALLOC_END-VMALLOC_START, KCORE_VMALLOC);
+	kclist_add(&kcore_kernel, &_stext, _end - _stext, KCORE_TEXT);
+	kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN,
+			KCORE_OTHER);
 	kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START,
-				 VSYSCALL_END - VSYSCALL_START);
+			 VSYSCALL_END - VSYSCALL_START, KCORE_OTHER);
 
 	printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
 			 "%ldk absent, %ldk reserved, %ldk data, %ldk init)\n",
Index: mmotm-2.6.31-Aug6/fs/proc/kcore.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/fs/proc/kcore.c
+++ mmotm-2.6.31-Aug6/fs/proc/kcore.c
@@ -62,10 +62,11 @@ static LIST_HEAD(kclist_head);
 static DEFINE_RWLOCK(kclist_lock);
 
 void
-kclist_add(struct kcore_list *new, void *addr, size_t size)
+kclist_add(struct kcore_list *new, void *addr, size_t size, int type)
 {
 	new->addr = (unsigned long)addr;
 	new->size = size;
+	new->type = type;
 
 	write_lock(&kclist_lock);
 	list_add_tail(&new->list, &kclist_head);

[PATCH 3/6] kcore regiter vmalloc area in generic way.

[KAMEZAWA Hiroyuki]

From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

For /proc/kcore, vmalloc areas are registered per arch. But, all of
them registers same range of [VMALLOC_START...VMALLOC_END)
This patch unifies them. By this. archs which have no kclist_add() hooks
can see vmalloc area correctly.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
 arch/ia64/mm/init.c       |    7 +------
 arch/mips/mm/init.c       |    4 +---
 arch/powerpc/mm/init_32.c |    4 ----
 arch/powerpc/mm/init_64.c |    4 ----
 arch/sh/mm/init.c         |    4 +---
 arch/x86/mm/init_32.c     |    4 +---
 arch/x86/mm/init_64.c     |    4 +---
 fs/proc/kcore.c           |    5 +++++
 8 files changed, 10 insertions(+), 26 deletions(-)

Index: mmotm-2.6.31-Aug6/fs/proc/kcore.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/fs/proc/kcore.c
+++ mmotm-2.6.31-Aug6/fs/proc/kcore.c
@@ -372,9 +372,14 @@ read_kcore(struct file *file, char __use
 	return acc;
 }
 
+static struct kcore_list kcore_vmalloc;
+
 static int __init proc_kcore_init(void)
 {
 	proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
+
+	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
+		VMALLOC_END - VMALLOC_START, KCORE_VMALLOC);
 	return 0;
 }
 module_init(proc_kcore_init);
Index: mmotm-2.6.31-Aug6/arch/x86/mm/init_32.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/x86/mm/init_32.c
+++ mmotm-2.6.31-Aug6/arch/x86/mm/init_32.c
@@ -857,7 +857,7 @@ static void __init test_wp_bit(void)
 	}
 }
 
-static struct kcore_list kcore_mem, kcore_vmalloc;
+static struct kcore_list kcore_mem;
 
 void __init mem_init(void)
 {
@@ -887,8 +887,6 @@ void __init mem_init(void)
 	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 
 	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT, KCORE_RAM);
-	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
-		   VMALLOC_END-VMALLOC_START, KCORE_VMALLOC);
 
 	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
 			"%dk reserved, %dk data, %dk init, %ldk highmem)\n",
Index: mmotm-2.6.31-Aug6/arch/x86/mm/init_64.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/x86/mm/init_64.c
+++ mmotm-2.6.31-Aug6/arch/x86/mm/init_64.c
@@ -647,7 +647,7 @@ EXPORT_SYMBOL_GPL(memory_add_physaddr_to
 
 #endif /* CONFIG_MEMORY_HOTPLUG */
 
-static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel,
+static struct kcore_list kcore_mem, kcore_kernel,
 			 kcore_modules, kcore_vsyscall;
 
 void __init mem_init(void)
@@ -678,8 +678,6 @@ void __init mem_init(void)
 
 	/* Register memory areas for /proc/kcore */
 	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT, KCORE_RAM);
-	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
-		   VMALLOC_END-VMALLOC_START, KCORE_VMALLOC);
 	kclist_add(&kcore_kernel, &_stext, _end - _stext, KCORE_TEXT);
 	kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN,
 			KCORE_OTHER);
Index: mmotm-2.6.31-Aug6/arch/mips/mm/init.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/mips/mm/init.c
+++ mmotm-2.6.31-Aug6/arch/mips/mm/init.c
@@ -352,7 +352,7 @@ void __init paging_init(void)
 	free_area_init_nodes(max_zone_pfns);
 }
 
-static struct kcore_list kcore_mem, kcore_vmalloc;
+static struct kcore_list kcore_mem;
 #ifdef CONFIG_64BIT
 static struct kcore_list kcore_kseg0;
 #endif
@@ -413,8 +413,6 @@ void __init mem_init(void)
 				0x80000000 - 4, KCORE_TEXT);
 #endif
 	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT, KCORE_RAM);
-	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
-		   VMALLOC_END-VMALLOC_START, KCORE_VMALLOC);
 
 	printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
 	       "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
Index: mmotm-2.6.31-Aug6/arch/powerpc/mm/init_32.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/powerpc/mm/init_32.c
+++ mmotm-2.6.31-Aug6/arch/powerpc/mm/init_32.c
@@ -243,7 +243,6 @@ void free_initrd_mem(unsigned long start
 #endif
 
 #ifdef CONFIG_PROC_KCORE
-static struct kcore_list kcore_vmem;
 
 static int __init setup_kcore(void)
 {
@@ -271,9 +270,6 @@ static int __init setup_kcore(void)
 		kclist_add(kcore_mem, __va(base), size, KCORE_RAM);
 	}
 
-	kclist_add(&kcore_vmem, (void *)VMALLOC_START,
-		VMALLOC_END-VMALLOC_START, KCORE_VMALLOC);
-
 	return 0;
 }
 module_init(setup_kcore);
Index: mmotm-2.6.31-Aug6/arch/ia64/mm/init.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/ia64/mm/init.c
+++ mmotm-2.6.31-Aug6/arch/ia64/mm/init.c
@@ -617,7 +617,7 @@ mem_init (void)
 	long reserved_pages, codesize, datasize, initsize;
 	pg_data_t *pgdat;
 	int i;
-	static struct kcore_list kcore_mem, kcore_vmem, kcore_kernel;
+	static struct kcore_list kcore_kernel;
 
 	BUG_ON(PTRS_PER_PGD * sizeof(pgd_t) != PAGE_SIZE);
 	BUG_ON(PTRS_PER_PMD * sizeof(pmd_t) != PAGE_SIZE);
@@ -636,12 +636,7 @@ mem_init (void)
 	BUG_ON(!mem_map);
 	max_mapnr = max_low_pfn;
 #endif
-
 	high_memory = __va(max_low_pfn * PAGE_SIZE);
-
-	kclist_add(&kcore_mem, __va(0), max_low_pfn * PAGE_SIZE, KCORE_RAM);
-	kclist_add(&kcore_vmem, (void *)VMALLOC_START,
-			VMALLOC_END-VMALLOC_START, KCORE_VMALLOC);
 	kclist_add(&kcore_kernel, _stext, _end - _stext, KCORE_TEXT);
 
 	for_each_online_pgdat(pgdat)
Index: mmotm-2.6.31-Aug6/arch/powerpc/mm/init_64.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/powerpc/mm/init_64.c
+++ mmotm-2.6.31-Aug6/arch/powerpc/mm/init_64.c
@@ -110,7 +110,6 @@ void free_initrd_mem(unsigned long start
 #endif
 
 #ifdef CONFIG_PROC_KCORE
-static struct kcore_list kcore_vmem;
 
 static int __init setup_kcore(void)
 {
@@ -131,9 +130,6 @@ static int __init setup_kcore(void)
 		kclist_add(kcore_mem, __va(base), size, KCORE_RAM);
 	}
 
-	kclist_add(&kcore_vmem, (void *)VMALLOC_START,
-		VMALLOC_END-VMALLOC_START, KCORE_VMALLOC);
-
 	return 0;
 }
 module_init(setup_kcore);
Index: mmotm-2.6.31-Aug6/arch/sh/mm/init.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/sh/mm/init.c
+++ mmotm-2.6.31-Aug6/arch/sh/mm/init.c
@@ -181,7 +181,7 @@ void __init paging_init(void)
 	set_fixmap_nocache(FIX_UNCACHED, __pa(&__uncached_start));
 }
 
-static struct kcore_list kcore_mem, kcore_vmalloc;
+static struct kcore_list kcore_mem;
 
 void __init mem_init(void)
 {
@@ -219,8 +219,6 @@ void __init mem_init(void)
 	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 
 	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT, KCORE_RAM);
-	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
-		   VMALLOC_END - VMALLOC_START, KCORE_VMALLOC);
 
 	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
 	       "%dk data, %dk init)\n",

[PATCH 4/6] kcore register text area in generic way

[KAMEZAWA Hiroyuki]

From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

Some 64bit arch has special segment for mapping kernel text. It should be
entried to /proc/kcore in addtion to direct-linear-map, vmalloc area.
This patch unifies KCORE_TEXT entry scattered under x86 and ia64.

I'm not familiar with other archs (mips has its own even after this patch)
but range of [_stext ..._end) is a valid area of text and it's not
in direct-map area, defining CONFIG_ARCH_PROC_KCORE_TEXT is only a necessary
thing to do.

Note: I left mips as it is now.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
 arch/ia64/Kconfig     |    4 ++++
 arch/ia64/mm/init.c   |    2 --
 arch/x86/Kconfig      |    4 ++++
 arch/x86/mm/init_64.c |    4 +---
 fs/proc/kcore.c       |   19 ++++++++++++++++++-
 5 files changed, 27 insertions(+), 6 deletions(-)

Index: mmotm-2.6.31-Aug6/arch/x86/Kconfig
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/x86/Kconfig
+++ mmotm-2.6.31-Aug6/arch/x86/Kconfig
@@ -1201,6 +1201,10 @@ config ARCH_MEMORY_PROBE
 	def_bool X86_64
 	depends on MEMORY_HOTPLUG
 
+config ARCH_PROC_KCORE_TEXT
+	def_bool y
+	depends on X86_64 && PROC_KCORE
+
 config ILLEGAL_POINTER_VALUE
        hex
        default 0 if X86_32
Index: mmotm-2.6.31-Aug6/arch/ia64/Kconfig
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/ia64/Kconfig
+++ mmotm-2.6.31-Aug6/arch/ia64/Kconfig
@@ -496,6 +496,10 @@ config HAVE_ARCH_NODEDATA_EXTENSION
 	def_bool y
 	depends on NUMA
 
+config ARCH_PROC_KCORE_TEXT
+	def_bool y
+	depends on PROC_KCORE
+
 config IA32_SUPPORT
 	bool "Support for Linux/x86 binaries"
 	help
Index: mmotm-2.6.31-Aug6/arch/ia64/mm/init.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/ia64/mm/init.c
+++ mmotm-2.6.31-Aug6/arch/ia64/mm/init.c
@@ -617,7 +617,6 @@ mem_init (void)
 	long reserved_pages, codesize, datasize, initsize;
 	pg_data_t *pgdat;
 	int i;
-	static struct kcore_list kcore_kernel;
 
 	BUG_ON(PTRS_PER_PGD * sizeof(pgd_t) != PAGE_SIZE);
 	BUG_ON(PTRS_PER_PMD * sizeof(pmd_t) != PAGE_SIZE);
@@ -637,7 +636,6 @@ mem_init (void)
 	max_mapnr = max_low_pfn;
 #endif
 	high_memory = __va(max_low_pfn * PAGE_SIZE);
-	kclist_add(&kcore_kernel, _stext, _end - _stext, KCORE_TEXT);
 
 	for_each_online_pgdat(pgdat)
 		if (pgdat->bdata->node_bootmem_map)
Index: mmotm-2.6.31-Aug6/arch/x86/mm/init_64.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/x86/mm/init_64.c
+++ mmotm-2.6.31-Aug6/arch/x86/mm/init_64.c
@@ -647,8 +647,7 @@ EXPORT_SYMBOL_GPL(memory_add_physaddr_to
 
 #endif /* CONFIG_MEMORY_HOTPLUG */
 
-static struct kcore_list kcore_mem, kcore_kernel,
-			 kcore_modules, kcore_vsyscall;
+static struct kcore_list kcore_mem, kcore_modules, kcore_vsyscall;
 
 void __init mem_init(void)
 {
@@ -678,7 +677,6 @@ void __init mem_init(void)
 
 	/* Register memory areas for /proc/kcore */
 	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT, KCORE_RAM);
-	kclist_add(&kcore_kernel, &_stext, _end - _stext, KCORE_TEXT);
 	kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN,
 			KCORE_OTHER);
 	kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START,
Index: mmotm-2.6.31-Aug6/fs/proc/kcore.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/fs/proc/kcore.c
+++ mmotm-2.6.31-Aug6/fs/proc/kcore.c
@@ -21,6 +21,7 @@
 #include <asm/uaccess.h>
 #include <asm/io.h>
 #include <linux/list.h>
+#include <asm/sections.h>
 
 #define CORE_STR "CORE"
 
@@ -374,10 +375,26 @@ read_kcore(struct file *file, char __use
 
 static struct kcore_list kcore_vmalloc;
 
+#ifdef CONFIG_ARCH_PROC_KCORE_TEXT
+static struct kcore_list kcore_text;
+/*
+ * If defined, special segment is used for mapping kernel text instead of
+ * direct-map area. We need to create special TEXT section.
+ */
+static void __init proc_kcore_text_init(void)
+{
+	kclist_add(&kcore_text, _stext, _end - _stext, KCORE_TEXT);
+}
+#else
+static void __init proc_kcore_text_init(void)
+{
+}
+#endif
+
 static int __init proc_kcore_init(void)
 {
 	proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
-
+	proc_kcore_text_init();
 	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
 		VMALLOC_END - VMALLOC_START, KCORE_VMALLOC);
 	return 0;

[PATCH 5/6] walk sytem ram range

[KAMEZAWA Hiroyuki]

From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

Originally, walk_memory_resource() was introduced to traverse all memory
of "System RAM" for detecting memory hotplug/unplug range.
For doing so, flags of IORESOUCE_MEM|IORESOURCE_BUSY was used and this
was enough for memory hotplug.

But for using other purpose, /proc/kcore, this may includes some firmware
area marked as IORESOURCE_BUSY | IORESOUCE_MEM. This patch makes the check
strict to find out busy "System RAM".

Note: PPC64 keeps their own walk_memory_resouce(), which walk through
ppc64's lmb informaton. Because old kclist_add() is called per lmb,
this patch makes no difference in behavior, finally.

And this patch removes CONFIG_MEMORY_HOTPLUG check from this function.
Because pfn_valid() just show "there is memmap or not* and cannot be used
for "there is physical memory or not", this function is useful in generic
to scan physical memory range.

Changelog v3->v4
 - because of reordering patches, some changes are added.
   - demoved CONFIG_MEMORY_HOTPLUG check.
   - move declaration from memory_hotplug.h to iomem.h

Changelog v2->v3
 - walk_memory_resource() is renamed to be walk_system_ram_range()
Changelog v2:
 - new patch from v2.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
 arch/powerpc/mm/mem.c          |    4 ++--
 drivers/net/ehea/ehea_qmr.c    |    2 +-
 include/linux/ioport.h         |    4 ++++
 include/linux/memory_hotplug.h |    8 --------
 kernel/resource.c              |   23 ++++++++++++++++-------
 mm/memory_hotplug.c            |    6 +++---
 6 files changed, 26 insertions(+), 21 deletions(-)

Index: mmotm-2.6.31-Aug6/kernel/resource.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/kernel/resource.c
+++ mmotm-2.6.31-Aug6/kernel/resource.c
@@ -233,13 +233,13 @@ int release_resource(struct resource *ol
 
 EXPORT_SYMBOL(release_resource);
 
-#if defined(CONFIG_MEMORY_HOTPLUG) && !defined(CONFIG_ARCH_HAS_WALK_MEMORY)
+#if !defined(CONFIG_ARCH_HAS_WALK_MEMORY)
 /*
  * Finds the lowest memory reosurce exists within [res->start.res->end)
- * the caller must specify res->start, res->end, res->flags.
+ * the caller must specify res->start, res->end, res->flags and "name".
  * If found, returns 0, res is overwritten, if not found, returns -1.
  */
-static int find_next_system_ram(struct resource *res)
+static int find_next_system_ram(struct resource *res, char *name)
 {
 	resource_size_t start, end;
 	struct resource *p;
@@ -255,6 +255,8 @@ static int find_next_system_ram(struct r
 		/* system ram is just marked as IORESOURCE_MEM */
 		if (p->flags != res->flags)
 			continue;
+		if (name && strcmp(p->name, name))
+			continue;
 		if (p->start > end) {
 			p = NULL;
 			break;
@@ -272,19 +274,26 @@ static int find_next_system_ram(struct r
 		res->end = p->end;
 	return 0;
 }
-int
-walk_memory_resource(unsigned long start_pfn, unsigned long nr_pages, void *arg,
-			int (*func)(unsigned long, unsigned long, void *))
+
+/*
+ * This function calls callback against all memory range of "System RAM"
+ * which are marked as IORESOURCE_MEM and IORESOUCE_BUSY.
+ * Now, this function is only for "System RAM".
+ */
+int walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
+		void *arg, int (*func)(unsigned long, unsigned long, void *))
 {
 	struct resource res;
 	unsigned long pfn, len;
 	u64 orig_end;
 	int ret = -1;
+
 	res.start = (u64) start_pfn << PAGE_SHIFT;
 	res.end = ((u64)(start_pfn + nr_pages) << PAGE_SHIFT) - 1;
 	res.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 	orig_end = res.end;
-	while ((res.start < res.end) && (find_next_system_ram(&res) >= 0)) {
+	while ((res.start < res.end) &&
+		(find_next_system_ram(&res, "System RAM") >= 0)) {
 		pfn = (unsigned long)(res.start >> PAGE_SHIFT);
 		len = (unsigned long)((res.end + 1 - res.start) >> PAGE_SHIFT);
 		ret = (*func)(pfn, len, arg);
Index: mmotm-2.6.31-Aug6/mm/memory_hotplug.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/mm/memory_hotplug.c
+++ mmotm-2.6.31-Aug6/mm/memory_hotplug.c
@@ -410,7 +410,7 @@ int online_pages(unsigned long pfn, unsi
 	if (!populated_zone(zone))
 		need_zonelists_rebuild = 1;
 
-	ret = walk_memory_resource(pfn, nr_pages, &onlined_pages,
+	ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages,
 		online_pages_range);
 	if (ret) {
 		printk(KERN_DEBUG "online_pages %lx at %lx failed\n",
@@ -702,7 +702,7 @@ offline_isolated_pages_cb(unsigned long 
 static void
 offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)
 {
-	walk_memory_resource(start_pfn, end_pfn - start_pfn, NULL,
+	walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL,
 				offline_isolated_pages_cb);
 }
 
@@ -728,7 +728,7 @@ check_pages_isolated(unsigned long start
 	long offlined = 0;
 	int ret;
 
-	ret = walk_memory_resource(start_pfn, end_pfn - start_pfn, &offlined,
+	ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined,
 			check_pages_isolated_cb);
 	if (ret < 0)
 		offlined = (long)ret;
Index: mmotm-2.6.31-Aug6/arch/powerpc/mm/mem.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/powerpc/mm/mem.c
+++ mmotm-2.6.31-Aug6/arch/powerpc/mm/mem.c
@@ -143,8 +143,8 @@ int arch_add_memory(int nid, u64 start, 
  * memory regions, find holes and callback for contiguous regions.
  */
 int
-walk_memory_resource(unsigned long start_pfn, unsigned long nr_pages, void *arg,
-			int (*func)(unsigned long, unsigned long, void *))
+walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
+		void *arg, int (*func)(unsigned long, unsigned long, void *))
 {
 	struct lmb_property res;
 	unsigned long pfn, len;
Index: mmotm-2.6.31-Aug6/drivers/net/ehea/ehea_qmr.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/drivers/net/ehea/ehea_qmr.c
+++ mmotm-2.6.31-Aug6/drivers/net/ehea/ehea_qmr.c
@@ -751,7 +751,7 @@ int ehea_create_busmap(void)
 
 	mutex_lock(&ehea_busmap_mutex);
 	ehea_mr_len = 0;
-	ret = walk_memory_resource(0, 1ULL << MAX_PHYSMEM_BITS, NULL,
+	ret = walk_system_ram_range(0, 1ULL << MAX_PHYSMEM_BITS, NULL,
 				   ehea_create_busmap_callback);
 	mutex_unlock(&ehea_busmap_mutex);
 	return ret;
Index: mmotm-2.6.31-Aug6/include/linux/ioport.h
===================================================================
--- mmotm-2.6.31-Aug6.orig/include/linux/ioport.h
+++ mmotm-2.6.31-Aug6/include/linux/ioport.h
@@ -184,5 +184,9 @@ extern void __devm_release_region(struct
 extern int iomem_map_sanity_check(resource_size_t addr, unsigned long size);
 extern int iomem_is_exclusive(u64 addr);
 
+extern int
+walk_system_ram_range(unsigned long start_pfn, unsigned long nr_pages,
+		void *arg, int (*func)(unsigned long, unsigned long, void *));
+
 #endif /* __ASSEMBLY__ */
 #endif	/* _LINUX_IOPORT_H */
Index: mmotm-2.6.31-Aug6/include/linux/memory_hotplug.h
===================================================================
--- mmotm-2.6.31-Aug6.orig/include/linux/memory_hotplug.h
+++ mmotm-2.6.31-Aug6/include/linux/memory_hotplug.h
@@ -191,14 +191,6 @@ static inline void register_page_bootmem
 
 #endif /* ! CONFIG_MEMORY_HOTPLUG */
 
-/*
- * Walk through all memory which is registered as resource.
- * arg is (start_pfn, nr_pages, private_arg_pointer)
- */
-extern int walk_memory_resource(unsigned long start_pfn,
-			unsigned long nr_pages, void *arg,
-			int (*func)(unsigned long, unsigned long, void *));
-
 #ifdef CONFIG_MEMORY_HOTREMOVE
 
 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);

[PATCH 6/6] kcore use registerd physmem information

[KAMEZAWA Hiroyuki]

From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

For /proc/kcore, each arch registers its memory range by kclist_add().
In usual,
	- range of physical memory
	- range of vmalloc area
	- text, etc...
are registered but "range of physical memory" has some troubles.
It doesn't updated at memory hotplug and it tend to include
unnecessary memory holes. Now, /proc/iomem (kernel/resource.c)
includes required physical memory range information and it's
properly updated at memory hotplug. Then, it's good to avoid
using its own code(duplicating information) and to rebuild
kclist for physical memory based on /proc/iomem.

Changelog: v3 -> v4
 - adjusted to reorder patch series.

Changelog: v2 -> v3
 - fixed HIGHMEM codes.
 - enhnanced sanity chesk in !HIGHMEM codes.
 - after this, x86-32, ia64, sh, powerpc has no private kclist codes.
   x86-64 and mips still have some.

Changelog: v1 -> v2
 - removed -EBUSY at memory hotplug in read_kcore()
   (continue reading is no problem in general.)
 - fixed initial value of kcore_need_update to be 1.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
 arch/mips/mm/init.c       |    2 
 arch/powerpc/mm/init_32.c |   32 --------
 arch/powerpc/mm/init_64.c |   26 ------
 arch/sh/mm/init.c         |    4 -
 arch/x86/mm/init_32.c     |    4 -
 arch/x86/mm/init_64.c     |    3 
 fs/proc/kcore.c           |  174 ++++++++++++++++++++++++++++++++++++++++++----
 7 files changed, 163 insertions(+), 82 deletions(-)

Index: mmotm-2.6.31-Aug6/fs/proc/kcore.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/fs/proc/kcore.c
+++ mmotm-2.6.31-Aug6/fs/proc/kcore.c
@@ -21,6 +21,9 @@
 #include <asm/uaccess.h>
 #include <asm/io.h>
 #include <linux/list.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/memory.h>
 #include <asm/sections.h>
 
 #define CORE_STR "CORE"
@@ -31,17 +34,6 @@
 
 static struct proc_dir_entry *proc_root_kcore;
 
-static int open_kcore(struct inode * inode, struct file * filp)
-{
-	return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
-}
-
-static ssize_t read_kcore(struct file *, char __user *, size_t, loff_t *);
-
-static const struct file_operations proc_kcore_operations = {
-	.read		= read_kcore,
-	.open		= open_kcore,
-};
 
 #ifndef kc_vaddr_to_offset
 #define	kc_vaddr_to_offset(v) ((v) - PAGE_OFFSET)
@@ -61,6 +53,7 @@ struct memelfnote
 
 static LIST_HEAD(kclist_head);
 static DEFINE_RWLOCK(kclist_lock);
+static int kcore_need_update = 1;
 
 void
 kclist_add(struct kcore_list *new, void *addr, size_t size, int type)
@@ -99,6 +92,122 @@ static size_t get_kcore_size(int *nphdr,
 	return size + *elf_buflen;
 }
 
+static void free_kclist_ents(struct list_head *head)
+{
+	struct kcore_list *tmp, *pos;
+
+	list_for_each_entry_safe(pos, tmp, head, list) {
+		list_del(&pos->list);
+		kfree(pos);
+	}
+}
+/*
+ * Replace all KCORE_RAM information with passed list.
+ */
+static void __kcore_update_ram(struct list_head *list)
+{
+	struct kcore_list *tmp, *pos;
+	LIST_HEAD(garbage);
+
+	write_lock(&kclist_lock);
+	if (kcore_need_update) {
+		list_for_each_entry_safe(pos, tmp, &kclist_head, list) {
+			if (pos->type == KCORE_RAM)
+				list_move(&pos->list, &garbage);
+		}
+		list_splice(list, &kclist_head);
+	} else
+		list_splice(list, &garbage);
+	kcore_need_update = 0;
+	write_unlock(&kclist_lock);
+
+	free_kclist_ents(&garbage);
+}
+
+
+#ifdef CONFIG_HIGHMEM
+/*
+ * If no highmem, we can assume [0...max_low_pfn) continuous range of memory
+ * because memory hole is not as big as !HIGHMEM case.
+ * (HIGHMEM is special because part of memory is _invisible_ from the kernel.)
+ */
+static int kcore_update_ram(void)
+{
+	LIST_HEAD(head);
+	struct kcore_list *ent;
+	int ret = 0;
+
+	ent = kmalloc(sizeof(*ent), GFP_KERNEL);
+	if (!ent)
+		return -ENOMEM;
+	ent->addr = (unsigned long)__va(0);
+	ent->size = max_low_pfn << PAGE_SHIFT;
+	ent->type = KCORE_RAM;
+	list_add(&ent->list, &head);
+	__kcore_update_ram(&head);
+	return ret;
+}
+
+#else /* !CONFIG_HIGHMEM */
+
+static int
+kclist_add_private(unsigned long pfn, unsigned long nr_pages, void *arg)
+{
+	struct list_head *head = (struct list_head *)arg;
+	struct kcore_list *ent;
+
+	ent = kmalloc(sizeof(*ent), GFP_KERNEL);
+	if (!ent)
+		return -ENOMEM;
+	ent->addr = (unsigned long)__va((pfn << PAGE_SHIFT));
+	ent->size = nr_pages << PAGE_SHIFT;
+
+	/* Sanity check: Can happen in 32bit arch...maybe */
+	if (ent->addr < (unsigned long) __va(0))
+		goto free_out;
+
+	/* cut not-mapped area. ....from ppc-32 code. */
+	if (ULONG_MAX - ent->addr < ent->size)
+		ent->size = ULONG_MAX - ent->addr;
+
+	/* cut when vmalloc() area is higher than direct-map area */
+	if (VMALLOC_START > __va(0)) {
+		if (ent->addr > VMALLOC_START)
+			goto free_out;
+		if (VMALLOC_START - ent->addr < ent->size)
+			ent->size = VMALLOC_START - ent->addr;
+	}
+
+	ent->type = KCORE_RAM;
+	list_add(&ent->list, head);
+	return 0;
+free_out:
+	kfree(ent);
+	return 0;
+}
+
+static int kcore_update_ram(void)
+{
+	int nid, ret;
+	unsigned long end_pfn;
+	LIST_HEAD(head);
+
+	/* Not inialized....update now */
+	/* find out "max pfn" */
+	end_pfn = 0;
+	for_each_node_state(nid, N_HIGH_MEMORY)
+		if (end_pfn < node_end_pfn(nid))
+			end_pfn = node_end_pfn(nid);
+	/* scan 0 to max_pfn */
+	ret = walk_system_ram_range(0, end_pfn, &head, kclist_add_private);
+	if (ret) {
+		free_kclist_ents(&head);
+		return -ENOMEM;
+	}
+	__kcore_update_ram(&head);
+	return ret;
+}
+#endif /* CONFIG_HIGHMEM */
 
 /*****************************************************************************/
 /*
@@ -373,6 +482,39 @@ read_kcore(struct file *file, char __use
 	return acc;
 }
 
+
+static int open_kcore(struct inode * inode, struct file *filp)
+{
+	if (!capable(CAP_SYS_RAWIO))
+		return -EPERM;
+	if (kcore_need_update)
+		kcore_update_ram();
+	return 0;
+}
+
+
+static const struct file_operations proc_kcore_operations = {
+	.read		= read_kcore,
+	.open		= open_kcore,
+};
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+/* just remember that we have to update kcore */
+static int __meminit kcore_callback(struct notifier_block *self,
+				    unsigned long action, void *arg)
+{
+	switch (action) {
+	case MEM_ONLINE:
+	case MEM_OFFLINE:
+		write_lock(&kclist_lock);
+		kcore_need_update = 1;
+		write_unlock(&kclist_lock);
+	}
+	return NOTIFY_OK;
+}
+#endif
+
+
 static struct kcore_list kcore_vmalloc;
 
 #ifdef CONFIG_ARCH_PROC_KCORE_TEXT
@@ -393,10 +535,18 @@ static void __init proc_kcore_text_init(
 
 static int __init proc_kcore_init(void)
 {
-	proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations);
+	proc_root_kcore = proc_create("kcore", S_IRUSR, NULL,
+				      &proc_kcore_operations);
+	/* Store text area if it's special */
 	proc_kcore_text_init();
+	/* Store vmalloc area */
 	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
 		VMALLOC_END - VMALLOC_START, KCORE_VMALLOC);
+	/* Store direct-map area from physical memory map */
+	kcore_update_ram();
+	hotplug_memory_notifier(kcore_callback, 0);
+	/* Other special area, area-for-module etc is arch specific. */
+
 	return 0;
 }
 module_init(proc_kcore_init);
Index: mmotm-2.6.31-Aug6/arch/x86/mm/init_32.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/x86/mm/init_32.c
+++ mmotm-2.6.31-Aug6/arch/x86/mm/init_32.c
@@ -857,8 +857,6 @@ static void __init test_wp_bit(void)
 	}
 }
 
-static struct kcore_list kcore_mem;
-
 void __init mem_init(void)
 {
 	int codesize, reservedpages, datasize, initsize;
@@ -886,8 +884,6 @@ void __init mem_init(void)
 	datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
 	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 
-	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT, KCORE_RAM);
-
 	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
 			"%dk reserved, %dk data, %dk init, %ldk highmem)\n",
 		nr_free_pages() << (PAGE_SHIFT-10),
Index: mmotm-2.6.31-Aug6/arch/x86/mm/init_64.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/x86/mm/init_64.c
+++ mmotm-2.6.31-Aug6/arch/x86/mm/init_64.c
@@ -647,7 +647,7 @@ EXPORT_SYMBOL_GPL(memory_add_physaddr_to
 
 #endif /* CONFIG_MEMORY_HOTPLUG */
 
-static struct kcore_list kcore_mem, kcore_modules, kcore_vsyscall;
+static struct kcore_list kcore_modules, kcore_vsyscall;
 
 void __init mem_init(void)
 {
@@ -676,7 +676,6 @@ void __init mem_init(void)
 	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 
 	/* Register memory areas for /proc/kcore */
-	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT, KCORE_RAM);
 	kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN,
 			KCORE_OTHER);
 	kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START,
Index: mmotm-2.6.31-Aug6/arch/mips/mm/init.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/mips/mm/init.c
+++ mmotm-2.6.31-Aug6/arch/mips/mm/init.c
@@ -352,7 +352,6 @@ void __init paging_init(void)
 	free_area_init_nodes(max_zone_pfns);
 }
 
-static struct kcore_list kcore_mem;
 #ifdef CONFIG_64BIT
 static struct kcore_list kcore_kseg0;
 #endif
@@ -412,7 +411,6 @@ void __init mem_init(void)
 		kclist_add(&kcore_kseg0, (void *) CKSEG0,
 				0x80000000 - 4, KCORE_TEXT);
 #endif
-	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT, KCORE_RAM);
 
 	printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
 	       "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
Index: mmotm-2.6.31-Aug6/arch/powerpc/mm/init_32.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/powerpc/mm/init_32.c
+++ mmotm-2.6.31-Aug6/arch/powerpc/mm/init_32.c
@@ -242,35 +242,3 @@ void free_initrd_mem(unsigned long start
 }
 #endif
 
-#ifdef CONFIG_PROC_KCORE
-
-static int __init setup_kcore(void)
-{
-	int i;
-
-	for (i = 0; i < lmb.memory.cnt; i++) {
-		unsigned long base;
-		unsigned long size;
-		struct kcore_list *kcore_mem;
-
-		base = lmb.memory.region[i].base;
-		size = lmb.memory.region[i].size;
-
-		kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
-		if (!kcore_mem)
-			panic("%s: kmalloc failed\n", __func__);
-
-		/* must stay under 32 bits */
-		if ( 0xfffffffful - (unsigned long)__va(base) < size) {
-			size = 0xfffffffful - (unsigned long)(__va(base));
-			printk(KERN_DEBUG "setup_kcore: restrict size=%lx\n",
-						size);
-		}
-
-		kclist_add(kcore_mem, __va(base), size, KCORE_RAM);
-	}
-
-	return 0;
-}
-module_init(setup_kcore);
-#endif
Index: mmotm-2.6.31-Aug6/arch/powerpc/mm/init_64.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/powerpc/mm/init_64.c
+++ mmotm-2.6.31-Aug6/arch/powerpc/mm/init_64.c
@@ -109,32 +109,6 @@ void free_initrd_mem(unsigned long start
 }
 #endif
 
-#ifdef CONFIG_PROC_KCORE
-
-static int __init setup_kcore(void)
-{
-	int i;
-
-	for (i=0; i < lmb.memory.cnt; i++) {
-		unsigned long base, size;
-		struct kcore_list *kcore_mem;
-
-		base = lmb.memory.region[i].base;
-		size = lmb.memory.region[i].size;
-
-		/* GFP_ATOMIC to avoid might_sleep warnings during boot */
-		kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
-		if (!kcore_mem)
-			panic("%s: kmalloc failed\n", __func__);
-
-		kclist_add(kcore_mem, __va(base), size, KCORE_RAM);
-	}
-
-	return 0;
-}
-module_init(setup_kcore);
-#endif
-
 static void pgd_ctor(void *addr)
 {
 	memset(addr, 0, PGD_TABLE_SIZE);
Index: mmotm-2.6.31-Aug6/arch/sh/mm/init.c
===================================================================
--- mmotm-2.6.31-Aug6.orig/arch/sh/mm/init.c
+++ mmotm-2.6.31-Aug6/arch/sh/mm/init.c
@@ -181,8 +181,6 @@ void __init paging_init(void)
 	set_fixmap_nocache(FIX_UNCACHED, __pa(&__uncached_start));
 }
 
-static struct kcore_list kcore_mem;
-
 void __init mem_init(void)
 {
 	int codesize, datasize, initsize;
@@ -218,8 +216,6 @@ void __init mem_init(void)
 	datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
 	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
 
-	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT, KCORE_RAM);
-
 	printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
 	       "%dk data, %dk init)\n",
 		nr_free_pages() << (PAGE_SHIFT-10),

Re: [PATCH 0/6] kcore clean up and enhance

[Amerigo Wang]

On Thu, Aug 06, 2009 at 07:24:16PM +0900, KAMEZAWA Hiroyuki wrote:
>
>This patch set is for /proc/kcore. By this,
>
> - many per-arch hooks are removed.
>
> - /proc/kcore will know really valid physical memory area.
>
> - /proc/kcore will be aware of memory hotplug.
>
> - /proc/kcore will be architecture independent i.e.
>   if an arch supports CONFIG_MMU, it can use /proc/kcore.
>   (if the arch uses usual memory layout.)



Hi, this version looks fine for me, I can't spot any obvious
mistakes now.

I would like to see these patches merged into -mm, so that
I can test the whole stuff about /proc/kcore.

Andrew, could you take these?

Thanks!


>
>BTW, I'll be on small trip from Aug/11 to Aug/17. So, my rtt may be
>bad in the next week.

Have a good trip! :)

Re: [PATCH 0/6] kcore clean up and enhance

[KAMEZAWA Hiroyuki]

On Wed, 12 Aug 2009 17:43:09 +0800
Amerigo Wang <xiyou.wangcong@gmail.com> wrote:

> On Thu, Aug 06, 2009 at 07:24:16PM +0900, KAMEZAWA Hiroyuki wrote:
> >
> >This patch set is for /proc/kcore. By this,
> >
> > - many per-arch hooks are removed.
> >
> > - /proc/kcore will know really valid physical memory area.
> >
> > - /proc/kcore will be aware of memory hotplug.
> >
> > - /proc/kcore will be architecture independent i.e.
> >   if an arch supports CONFIG_MMU, it can use /proc/kcore.
> >   (if the arch uses usual memory layout.)
> 
> 
> 
> Hi, this version looks fine for me, I can't spot any obvious
> mistakes now.
> 
> I would like to see these patches merged into -mm, so that
> I can test the whole stuff about /proc/kcore.
> 
> Andrew, could you take these?
> 
I'm back. I'll rewrite a rebased one to the newest rc(or mmotm)
and check it.

Thanks,
-Kame