This is a note to let you know that I've just added the patch titled
arm64: mm: Make icache synchronisation logic huge page aware
to the 3.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-mm-make-icache-synchronisation-logic-huge-page-aware.patch
and it can be found in the queue-3.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 923b8f5044da753e4985ab15c1374ced2cdf616c Mon Sep 17 00:00:00 2001
From: Steve Capper <steve.capper@xxxxxxxxxx>
Date: Wed, 2 Jul 2014 11:46:23 +0100
Subject: arm64: mm: Make icache synchronisation logic huge page aware
From: Steve Capper <steve.capper@xxxxxxxxxx>
commit 923b8f5044da753e4985ab15c1374ced2cdf616c upstream.
The __sync_icache_dcache routine will only flush the dcache for the
first page of a compound page, potentially leading to stale icache
data residing further on in a hugetlb page.
This patch addresses this issue by taking into consideration the
order of the page when flushing the dcache.
Reported-by: Mark Brown <broonie@xxxxxxxxxx>
Tested-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Steve Capper <steve.capper@xxxxxxxxxx>
Acked-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/mm/flush.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/arch/arm64/mm/flush.c
+++ b/arch/arm64/mm/flush.c
@@ -79,7 +79,8 @@ void __sync_icache_dcache(pte_t pte, uns
return;
if (!test_and_set_bit(PG_dcache_clean, &page->flags)) {
- __flush_dcache_area(page_address(page), PAGE_SIZE);
+ __flush_dcache_area(page_address(page),
+ PAGE_SIZE << compound_order(page));
__flush_icache_all();
} else if (icache_is_aivivt()) {
__flush_icache_all();
Patches currently in stable-queue which might be from steve.capper@xxxxxxxxxx are
queue-3.15/arm64-mm-make-icache-synchronisation-logic-huge-page-aware.patch
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