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 |
|---|---|---|
| test | ||
| Kbuild | -rw-r--r-- | 2.9 KB |
| Makefile | -rw-r--r-- | 153 bytes |
| acpi_nfit_test.c | -rw-r--r-- | 435 bytes |
| config_check.c | -rw-r--r-- | 565 bytes |
| dax-dev.c | -rw-r--r-- | 963 bytes |
| dax_pmem_compat_test.c | -rw-r--r-- | 212 bytes |
| dax_pmem_core_test.c | -rw-r--r-- | 210 bytes |
| dax_pmem_test.c | -rw-r--r-- | 205 bytes |
| device_dax_test.c | -rw-r--r-- | 207 bytes |
| dimm_devs.c | -rw-r--r-- | 874 bytes |
| libnvdimm_test.c | -rw-r--r-- | 206 bytes |
| pmem-dax.c | -rw-r--r-- | 1.2 KB |
| pmem_test.c | -rw-r--r-- | 201 bytes |
| watermark.h | -rw-r--r-- | 707 bytes |
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