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[ARM] 4078/1: Fix ARM copypage cache coherency problems 

If PG_dcache_dirty is set for a page, we need to flush the source page
before performing any copypage operation using a different virtual address.

This fixes the copypage implementations for XScale, StrongARM and ARMv6.

This patch fixes segmentation faults seen in the dynamic linker under
the usage patterns in glibc 2.4/2.5.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Richard Purdie 2006-12-30 16:08:50 +01:00 committed by Russell King
parent b0b1d60a64
commit 1c9d3df5e8
4 changed files with 18 additions and 0 deletions
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6
arch/arm/mm/copypage-v4mc.c
View File

@ -19,6 +19,7 @@
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/cacheflush.h>
#include "mm.h"
@ -69,6 +70,11 @@ mc_copy_user_page(void *from, void *to)
void v4_mc_copy_user_page(void *kto, const void *kfrom, unsigned long vaddr)
{
struct page *page = virt_to_page(kfrom);
if (test_and_clear_bit(PG_dcache_dirty, &page->flags))
__flush_dcache_page(page_mapping(page), page);
spin_lock(&minicache_lock);
set_pte_ext(TOP_PTE(0xffff8000), pfn_pte(__pa(kfrom) >> PAGE_SHIFT, minicache_pgprot), 0);

4
arch/arm/mm/copypage-v6.c
View File

@ -53,6 +53,10 @@ static void v6_copy_user_page_aliasing(void *kto, const void *kfrom, unsigned lo
{
unsigned int offset = CACHE_COLOUR(vaddr);
unsigned long from, to;
struct page *page = virt_to_page(kfrom);
if (test_and_clear_bit(PG_dcache_dirty, &page->flags))
__flush_dcache_page(page_mapping(page), page);
/*
* Discard data in the kernel mapping for the new page.

6
arch/arm/mm/copypage-xscale.c
View File

@ -19,6 +19,7 @@
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/cacheflush.h>
#include "mm.h"
@ -91,6 +92,11 @@ mc_copy_user_page(void *from, void *to)
void xscale_mc_copy_user_page(void *kto, const void *kfrom, unsigned long vaddr)
{
struct page *page = virt_to_page(kfrom);
if (test_and_clear_bit(PG_dcache_dirty, &page->flags))
__flush_dcache_page(page_mapping(page), page);
spin_lock(&minicache_lock);
set_pte_ext(TOP_PTE(COPYPAGE_MINICACHE), pfn_pte(__pa(kfrom) >> PAGE_SHIFT, minicache_pgprot), 0);

2
include/asm-arm/cacheflush.h
View File

@ -355,6 +355,8 @@ extern void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
*/
extern void flush_dcache_page(struct page *);
extern void __flush_dcache_page(struct address_space *mapping, struct page *page);
#define flush_dcache_mmap_lock(mapping) \
write_lock_irq(&(mapping)->tree_lock)
#define flush_dcache_mmap_unlock(mapping) \