Messages in this thread Patch in this message | | | From | Christoph Hellwig <> | Subject | [PATCH 1/2] mm: call flush_dcache_page in memcpy_to_page and memzero_page | Date | Tue, 13 Jul 2021 07:52:30 +0200 |
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memcpy_to_page and memzero_page can write to arbitrary pages, which could be in the page cache or in high memory, so call flush_kernel_dcache_pages to flush the dcache.
Fixes: bb90d4bc7b6a ("mm/highmem: Lift memcpy_[to|from]_page to core") Fixes: 28961998f858 ("iov_iter: lift memzero_page() to highmem.h") Signed-off-by: Christoph Hellwig <hch@lst.de> --- include/linux/highmem.h | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/include/linux/highmem.h b/include/linux/highmem.h index 8c6e8e996c87..8e7e50a53a12 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -318,6 +318,7 @@ static inline void memcpy_to_page(struct page *page, size_t offset, VM_BUG_ON(offset + len > PAGE_SIZE); memcpy(to + offset, from, len); + flush_dcache_page(page); kunmap_local(to); } @@ -325,6 +326,7 @@ static inline void memzero_page(struct page *page, size_t offset, size_t len) { char *addr = kmap_atomic(page); memset(addr + offset, 0, len); + flush_dcache_page(page); kunmap_atomic(addr); } -- 2.30.2
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