From: tip-bot for Minfei Huang <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: hpa@zytor.com, tglx@linutronix.de, linux-kernel@vger.kernel.org,
mingo@kernel.org, mnfhuang@gmail.com
Subject: [tip:x86/mm] x86: mm: Re-use the early_ioremap fixed area
Date: Mon, 3 Nov 2014 04:42:30 -0800 [thread overview]
Message-ID: <tip-63e7b6d90c1ebdb73d82eedb945b62ceedc3f963@git.kernel.org> (raw)
In-Reply-To: <1414582717-32729-1-git-send-email-mnfhuang@gmail.com>
Commit-ID: 63e7b6d90c1ebdb73d82eedb945b62ceedc3f963
Gitweb: http://git.kernel.org/tip/63e7b6d90c1ebdb73d82eedb945b62ceedc3f963
Author: Minfei Huang <mnfhuang@gmail.com>
AuthorDate: Wed, 29 Oct 2014 19:38:37 +0800
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitDate: Mon, 3 Nov 2014 13:40:44 +0100
x86: mm: Re-use the early_ioremap fixed area
The temp fixed area is only used during boot for early_ioremap(), and
it is unused when ioremap() is functional. vmalloc/pkmap area become
available after early boot so the temp fixed area is available for
re-use.
The virtual address is more precious on i386, especially turning on
high memory. So we can re-use the virtual address space.
Remove the now unused defines FIXADDR_BOOT_START and FIXADDR_BOOT_SIZE.
Signed-off-by: Minfei Huang <mnfhuang@gmail.com>
Cc: pbonzini@redhat.com
Cc: bp@suse.de
Link: http://lkml.kernel.org/r/1414582717-32729-1-git-send-email-mnfhuang@gmail.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/include/asm/fixmap.h | 2 --
arch/x86/include/asm/highmem.h | 25 ++++++++++++++-----------
arch/x86/include/asm/pgtable_32_types.h | 4 ++--
3 files changed, 16 insertions(+), 15 deletions(-)
diff --git a/arch/x86/include/asm/fixmap.h b/arch/x86/include/asm/fixmap.h
index ffb1733..bf728e4 100644
--- a/arch/x86/include/asm/fixmap.h
+++ b/arch/x86/include/asm/fixmap.h
@@ -136,9 +136,7 @@ enum fixed_addresses {
extern void reserve_top_address(unsigned long reserve);
#define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT)
-#define FIXADDR_BOOT_SIZE (__end_of_fixed_addresses << PAGE_SHIFT)
#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE)
-#define FIXADDR_BOOT_START (FIXADDR_TOP - FIXADDR_BOOT_SIZE)
extern int fixmaps_set;
diff --git a/arch/x86/include/asm/highmem.h b/arch/x86/include/asm/highmem.h
index 302a323..04e9d02 100644
--- a/arch/x86/include/asm/highmem.h
+++ b/arch/x86/include/asm/highmem.h
@@ -38,17 +38,20 @@ extern unsigned long highstart_pfn, highend_pfn;
/*
* Ordering is:
*
- * FIXADDR_TOP
- * fixed_addresses
- * FIXADDR_START
- * temp fixed addresses
- * FIXADDR_BOOT_START
- * Persistent kmap area
- * PKMAP_BASE
- * VMALLOC_END
- * Vmalloc area
- * VMALLOC_START
- * high_memory
+ * high memory on: high_memory off:
+ * FIXADDR_TOP FIXADDR_TOP
+ * fixed addresses fixed addresses
+ * FIXADDR_START FIXADDR_START
+ * temp fixed addresses/persistent kmap area VMALLOC_END
+ * PKMAP_BASE temp fixed addresses/vmalloc area
+ * VMALLOC_END VMALLOC_START
+ * vmalloc area high_memory
+ * VMALLOC_START
+ * high_memory
+ *
+ * The temp fixed area is only used during boot for early_ioremap(), and
+ * it is unused when the ioremap() is functional. vmalloc/pkmap area become
+ * available after early boot so the temp fixed area is available for re-use.
*/
#define LAST_PKMAP_MASK (LAST_PKMAP-1)
#define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT)
diff --git a/arch/x86/include/asm/pgtable_32_types.h b/arch/x86/include/asm/pgtable_32_types.h
index 2ac5fc8..9fb2f2b 100644
--- a/arch/x86/include/asm/pgtable_32_types.h
+++ b/arch/x86/include/asm/pgtable_32_types.h
@@ -37,13 +37,13 @@ extern bool __vmalloc_start_set; /* set once high_memory is set */
#define LAST_PKMAP 1024
#endif
-#define PKMAP_BASE ((FIXADDR_BOOT_START - PAGE_SIZE * (LAST_PKMAP + 1)) \
+#define PKMAP_BASE ((FIXADDR_START - PAGE_SIZE * (LAST_PKMAP + 1)) \
& PMD_MASK)
#ifdef CONFIG_HIGHMEM
# define VMALLOC_END (PKMAP_BASE - 2 * PAGE_SIZE)
#else
-# define VMALLOC_END (FIXADDR_BOOT_START - 2 * PAGE_SIZE)
+# define VMALLOC_END (FIXADDR_START - 2 * PAGE_SIZE)
#endif
#define MODULES_VADDR VMALLOC_START
prev parent reply other threads:[~2014-11-03 12:42 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-29 11:38 [PATCH v2] x86/mm: " Minfei Huang
2014-11-03 12:42 ` tip-bot for Minfei Huang [this message]
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