[POC][PATCH 76/83] [mips, s390, score] turn empty_zero_page into pointer

[Al Viro <viro@ZenIV.linux.org.uk>]

From: Al Viro <viro@zeniv.linux.org.uk>

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 arch/mips/include/asm/pgtable.h  | 4 ++--
 arch/mips/mm/init.c              | 7 ++++---
 arch/s390/include/asm/pgtable.h  | 6 +++---
 arch/s390/mm/init.c              | 7 ++++---
 arch/score/include/asm/pgtable.h | 6 +++---
 arch/score/mm/init.c             | 6 +++---
 6 files changed, 19 insertions(+), 17 deletions(-)

diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h
index 8957f15..f0e06c6 100644
--- a/arch/mips/include/asm/pgtable.h
+++ b/arch/mips/include/asm/pgtable.h
@@ -75,11 +75,11 @@ extern unsigned long _page_cachable_default;
  * for zero-mapped memory areas etc..
  */
 
-extern unsigned long empty_zero_page;
+extern void *empty_zero_page;
 extern unsigned long zero_page_mask;
 
 #define ZERO_PAGE(vaddr) \
-	(virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
+	(virt_to_page((empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
 #define __HAVE_COLOR_ZERO_PAGE
 
 extern void paging_init(void);
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
index 8770e61..872e7a1 100644
--- a/arch/mips/mm/init.c
+++ b/arch/mips/mm/init.c
@@ -53,7 +53,8 @@
  * any price.  Since page is never written to after the initialization we
  * don't have to care about aliases on other CPUs.
  */
-unsigned long empty_zero_page, zero_page_mask;
+void *empty_zero_page;
+unsigned long zero_page_mask;
 EXPORT_SYMBOL_GPL(empty_zero_page);
 EXPORT_SYMBOL(zero_page_mask);
 
@@ -70,11 +71,11 @@ void setup_zero_pages(void)
 	else
 		order = 0;
 
-	empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
+	empty_zero_page = get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
 	if (!empty_zero_page)
 		panic("Oh boy, that early out of memory?");
 
-	page = virt_to_page((void *)empty_zero_page);
+	page = virt_to_page(empty_zero_page);
 	split_page(page, order);
 	for (i = 0; i < (1 << order); i++, page++)
 		mark_page_reserved(page);
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 024f85f..f6fe409 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -47,12 +47,12 @@ extern void vmem_map_init(void);
  * for zero-mapped memory areas etc..
  */
 
-extern unsigned long empty_zero_page;
+extern void *empty_zero_page;
 extern unsigned long zero_page_mask;
 
 #define ZERO_PAGE(vaddr) \
-	(virt_to_page((void *)(empty_zero_page + \
-	 (((unsigned long)(vaddr)) &zero_page_mask))))
+	(virt_to_page(empty_zero_page + \
+	 (((unsigned long)(vaddr)) &zero_page_mask)))
 #define __HAVE_COLOR_ZERO_PAGE
 
 /* TODO: s390 cannot support io_remap_pfn_range... */
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index c722400..7c8190f 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -42,7 +42,8 @@
 
 pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
 
-unsigned long empty_zero_page, zero_page_mask;
+void *empty_zero_page;
+unsigned long zero_page_mask;
 EXPORT_SYMBOL(empty_zero_page);
 EXPORT_SYMBOL(zero_page_mask);
 
@@ -59,11 +60,11 @@ static void __init setup_zero_pages(void)
 	while (order > 2 && (totalram_pages >> 10) < (1UL << order))
 		order--;
 
-	empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
+	empty_zero_page = get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
 	if (!empty_zero_page)
 		panic("Out of memory in setup_zero_pages");
 
-	page = virt_to_page((void *) empty_zero_page);
+	page = virt_to_page(empty_zero_page);
 	split_page(page, order);
 	for (i = 1 << order; i > 0; i--) {
 		mark_page_reserved(page);
diff --git a/arch/score/include/asm/pgtable.h b/arch/score/include/asm/pgtable.h
index 0553e5c..8f5b1be 100644
--- a/arch/score/include/asm/pgtable.h
+++ b/arch/score/include/asm/pgtable.h
@@ -163,12 +163,12 @@ static inline pgprot_t pgprot_noncached(pgprot_t _prot)
 #define __swp_offset(x) 	((x).val >> 10)
 #define __swp_entry(type, offset) ((swp_entry_t){(type) | ((offset) << 10)})
 
-extern unsigned long empty_zero_page;
+extern void *empty_zero_page;
 extern unsigned long zero_page_mask;
 
 #define ZERO_PAGE(vaddr) \
-	(virt_to_page((void *)(empty_zero_page + \
-	 (((unsigned long)(vaddr)) & zero_page_mask))))
+	(virt_to_page(empty_zero_page + \
+	 (((unsigned long)(vaddr)) & zero_page_mask)))
 
 #define pgtable_cache_init()	do {} while (0)
 
diff --git a/arch/score/mm/init.c b/arch/score/mm/init.c
index 9fbce49..b4db012 100644
--- a/arch/score/mm/init.c
+++ b/arch/score/mm/init.c
@@ -38,18 +38,18 @@
 #include <asm/sections.h>
 #include <asm/tlb.h>
 
-unsigned long empty_zero_page;
+void *empty_zero_page;
 EXPORT_SYMBOL_GPL(empty_zero_page);
 
 static void setup_zero_page(void)
 {
 	struct page *page;
 
-	empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, 0);
+	empty_zero_page = get_free_pages(GFP_KERNEL | __GFP_ZERO, 0);
 	if (!empty_zero_page)
 		panic("Oh boy, that early out of memory?");
 
-	page = virt_to_page((void *) empty_zero_page);
+	page = virt_to_page(empty_zero_page);
 	mark_page_reserved(page);
 }
 
-- 
2.1.4