* [merged] mm-call-flush_dcache_page-in-memcpy_to_page-and-memzero_page.patch removed from -mm tree
@ 2021-07-27 19:35 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2021-07-27 19:35 UTC (permalink / raw)
To: chaitanya.kulkarni, hch, ira.weiny, mm-commits, stable
The patch titled
Subject: mm: call flush_dcache_page() in memcpy_to_page() and memzero_page()
has been removed from the -mm tree. Its filename was
mm-call-flush_dcache_page-in-memcpy_to_page-and-memzero_page.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Christoph Hellwig <hch@lst.de>
Subject: mm: call flush_dcache_page() in memcpy_to_page() and memzero_page()
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.
This is a problem when using these helpers on dcache challeneged
architectures. Right now there are just a few users, chances are no
one used the PC floppy dr\u0456ver, the aha1542 driver for an ISA SCSI
HBA, and a few advanced and optional btrfs and ext4 features on those
platforms yet since the conversion.
Link: https://lkml.kernel.org/r/20210713055231.137602-2-hch@lst.de
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>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Cc: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
include/linux/highmem.h | 2 ++
1 file changed, 2 insertions(+)
--- a/include/linux/highmem.h~mm-call-flush_dcache_page-in-memcpy_to_page-and-memzero_page
+++ a/include/linux/highmem.h
@@ -318,6 +318,7 @@ static inline void memcpy_to_page(struct
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 p
{
char *addr = kmap_atomic(page);
memset(addr + offset, 0, len);
+ flush_dcache_page(page);
kunmap_atomic(addr);
}
_
Patches currently in -mm which might be from hch@lst.de are
mmc-jz4740-remove-the-flush_kernel_dcache_page-call-in-jz4740_mmc_read_data.patch
mmc-mmc_spi-replace-flush_kernel_dcache_page-with-flush_dcache_page.patch
ps3disk-replace-flush_kernel_dcache_page-with-flush_dcache_page.patch
scatterlist-replace-flush_kernel_dcache_page-with-flush_dcache_page.patch
mm-remove-flush_kernel_dcache_page.patch
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2021-07-27 19:35 [merged] mm-call-flush_dcache_page-in-memcpy_to_page-and-memzero_page.patch removed from -mm tree akpm
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