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ARM: 5794/1: Flush the D-cache during copy_user_highpage()

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The I and D caches for copy-on-write pages on processors with
write-allocate caches become incoherent causing problems on application
relying on CoW for text pages (dynamic linker relocating symbols in a
text page). This patch flushes the D-cache for such pages.

Cc: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Catalin Marinas 2009-11-24 18:54:07 +01:00 committed by Russell King
parent f91fb05d82
commit 115b22474e
1 changed files with 8 additions and 0 deletions
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8
arch/arm/mm/copypage-v6.c
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@ -41,6 +41,14 @@ static void v6_copy_user_highpage_nonaliasing(struct page *to,
kfrom = kmap_atomic(from, KM_USER0);
kto = kmap_atomic(to, KM_USER1);
copy_page(kto, kfrom);
#ifdef CONFIG_HIGHMEM
/*
* kmap_atomic() doesn't set the page virtual address, and
* kunmap_atomic() takes care of cache flushing already.
*/
if (page_address(to) != NULL)
#endif
__cpuc_flush_dcache_page(kto);
kunmap_atomic(kto, KM_USER1);
kunmap_atomic(kfrom, KM_USER0);
}