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authorRichard Purdie <rpurdie@rpsys.net>2006-12-30 16:08:50 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-12-30 17:05:08 +0000
commit1c9d3df5e88ad7db23f5b22f4341c39722a904a4 (patch)
treedbabefd52a5f8a5f35216bda33f29e4b9b398569 /arch/arm/mm/copypage-v6.c
parentb0b1d60a64054697ef828e0565f006cc0f823590 (diff)
downloadop-kernel-dev-1c9d3df5e88ad7db23f5b22f4341c39722a904a4.zip
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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>
Diffstat (limited to 'arch/arm/mm/copypage-v6.c')
-rw-r--r--arch/arm/mm/copypage-v6.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/mm/copypage-v6.c b/arch/arm/mm/copypage-v6.c
index 865777d..3adb792 100644
--- a/arch/arm/mm/copypage-v6.c
+++ b/arch/arm/mm/copypage-v6.c
@@ -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.
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