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Date: Mon, 21 Dec 2015 23:47:49 +0000
From: Al Viro <viro@...IV.linux.org.uk>
To: linux-kernel@...r.kernel.org
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [POC][PATCH 76/83] [mips, s390, score] turn empty_zero_page into pointer
From: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Al Viro <viro@...iv.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
--
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