From: zhangshaokun <zhangshaokun@xxxxxxxxxxxxx>
In aarch64 sync icache and dcache, if anonymous pages hold self-modified code
and these pages are migrated, it also should be flushed dcache and invalided icache.
Therefore,page_mapping(page) check should be removed, otherwise icache maybe
fetch stale instruction from PoU.
Signed-off-by: Zhangshaokun <zhangshaokun@xxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxx
---
arch/arm64/mm/flush.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c
index dbd12ea..43a76b0 100644
--- a/arch/arm64/mm/flush.c
+++ b/arch/arm64/mm/flush.c
@@ -71,10 +71,6 @@ void __sync_icache_dcache(pte_t pte, unsigned long addr)
{
struct page *page = pte_page(pte);
- /* no flushing needed for anonymous pages */
- if (!page_mapping(page))
- return;
-
if (!test_and_set_bit(PG_dcache_clean, &page->flags))
sync_icache_aliases(page_address(page),
PAGE_SIZE << compound_order(page));
--
1.9.1
--
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