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ARM: 7923/1: mm: fix dcache flush logic for compound high pages

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When given a compound high page, __flush_dcache_page will only flush
the first page of the compound page repeatedly rather than the entire
set of constituent pages.

This error was introduced by:
   0b19f93 ARM: mm: Add support for flushing HugeTLB pages.

This patch corrects the logic such that all constituent pages are now
flushed.

Cc: stable@vger.kernel.org # 3.10+
Signed-off-by: Steve Capper <steve.capper@linaro.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Steven Capper 2013-12-16 17:25:52 +01:00 committed by Russell King
parent 4ff859fe1d
commit 2a7cfcbc05
1 changed files with 3 additions and 3 deletions
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6
arch/arm/mm/flush.c
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@ -175,16 +175,16 @@ void __flush_dcache_page(struct address_space *mapping, struct page *page)
unsigned long i;
if (cache_is_vipt_nonaliasing()) {
for (i = 0; i < (1 << compound_order(page)); i++) {
void *addr = kmap_atomic(page);
void *addr = kmap_atomic(page + i);
__cpuc_flush_dcache_area(addr, PAGE_SIZE);
kunmap_atomic(addr);
}
} else {
for (i = 0; i < (1 << compound_order(page)); i++) {
void *addr = kmap_high_get(page);
void *addr = kmap_high_get(page + i);
if (addr) {
__cpuc_flush_dcache_area(addr, PAGE_SIZE);
kunmap_high(page);
kunmap_high(page + i);
}
}
}