| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.12 50/77] ARM: 7923/1: mm: fix dcache flush logic for compound high pages | Date | Mon, 13 Jan 2014 16:28:11 -0800 |
| |
3.12-stable review patch. If anyone has any objections, please let me know.
------------------
From: Steven Capper <steve.capper@linaro.org>
commit 2a7cfcbc0553365d75716f69ee7b704cac7c9248 upstream.
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.
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/arm/mm/flush.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/arch/arm/mm/flush.c +++ b/arch/arm/mm/flush.c @@ -175,16 +175,16 @@ void __flush_dcache_page(struct address_ 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); } } }
|