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sh: Provide __flush_anon_page().

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This provides a __flush_anon_page() that handles both the aliasing and
non-aliasing cases. This fixes up some crashes with heavy
get_user_pages() users.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
2009-08-04 16:02:43 +09:00
parent b5eb10ae90
commit c0fe478dbb
2 changed files with 31 additions and 0 deletions
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14
arch/sh/include/asm/cacheflush.h
View File

@@ -1,6 +1,8 @@
#ifndef __ASM_SH_CACHEFLUSH_H #ifndef __ASM_SH_CACHEFLUSH_H
#define __ASM_SH_CACHEFLUSH_H #define __ASM_SH_CACHEFLUSH_H
#include <linux/mm.h>
#ifdef __KERNEL__ #ifdef __KERNEL__
#ifdef CONFIG_CACHE_OFF #ifdef CONFIG_CACHE_OFF
@@ -43,6 +45,18 @@ extern void __flush_purge_region(void *start, int size);
extern void __flush_invalidate_region(void *start, int size); extern void __flush_invalidate_region(void *start, int size);
#endif #endif
#ifdef CONFIG_MMU
#define ARCH_HAS_FLUSH_ANON_PAGE
extern void __flush_anon_page(struct page *page, unsigned long);
static inline void flush_anon_page(struct vm_area_struct *vma,
struct page *page, unsigned long vmaddr)
{
if (boot_cpu_data.dcache.n_aliases && PageAnon(page))
__flush_anon_page(page, vmaddr);
}
#endif
#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE #define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
static inline void flush_kernel_dcache_page(struct page *page) static inline void flush_kernel_dcache_page(struct page *page)
{ {

17
arch/sh/mm/pg-mmu.c
View File

@@ -157,3 +157,20 @@ void __update_cache(struct vm_area_struct *vma,
} }
} }
} }
void __flush_anon_page(struct page *page, unsigned long vmaddr)
{
unsigned long addr = (unsigned long) page_address(page);
if (pages_do_alias(addr, vmaddr)) {
if (boot_cpu_data.dcache.n_aliases && page_mapped(page) &&
!test_bit(PG_dcache_dirty, &page->flags)) {
void *kaddr;
kaddr = kmap_coherent(page, vmaddr);
__flush_wback_region((void *)kaddr, PAGE_SIZE);
kunmap_coherent();
} else
__flush_wback_region((void *)addr, PAGE_SIZE);
}
}