Revision 8dad53a11f8d94dceb540a5f8f153484f42be84b authored by Christoph Hellwig on 23 July 2021, 22:50:17 UTC, committed by Linus Torvalds on 24 July 2021, 00:43:28 UTC
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 driver, 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>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 236e9f1
| File | Mode | Size |
|---|---|---|
| api | ||
| bpf | ||
| lockdep | ||
| perf | ||
| subcmd | ||
| symbol | ||
| traceevent | ||
| argv_split.c | -rw-r--r-- | 1.7 KB |
| bitmap.c | -rw-r--r-- | 2.3 KB |
| ctype.c | -rw-r--r-- | 1.3 KB |
| find_bit.c | -rw-r--r-- | 2.6 KB |
| hweight.c | -rw-r--r-- | 1.8 KB |
| rbtree.c | -rw-r--r-- | 16.1 KB |
| str_error_r.c | -rw-r--r-- | 1.0 KB |
| string.c | -rw-r--r-- | 4.5 KB |
| vsprintf.c | -rw-r--r-- | 900 bytes |
| zalloc.c | -rw-r--r-- | 197 bytes |
Computing file changes ...
