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| author | Christoph Hellwig <[email protected]> | 2021-07-23 22:50:17 +0000 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2021-07-24 00:43:28 +0000 |
| commit | 8dad53a11f8d94dceb540a5f8f153484f42be84b (patch) | |
| tree | ed9848784ee4edb85c760823501df4dc5be134a8 /lib/debugobjects.c | |
| parent | kfence: skip all GFP_ZONEMASK allocations (diff) | |
| download | kernel-8dad53a11f8d94dceb540a5f8f153484f42be84b.tar.gz kernel-8dad53a11f8d94dceb540a5f8f153484f42be84b.zip | |
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 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/[email protected]
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 <[email protected]>
Reviewed-by: Ira Weiny <[email protected]>
Cc: Chaitanya Kulkarni <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'lib/debugobjects.c')
0 files changed, 0 insertions, 0 deletions