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| author | Dan Williams <[email protected]> | 2018-05-04 00:06:21 +0000 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2018-05-15 06:32:42 +0000 |
| commit | 60622d68227d6d71fdfba5fb39f7f3d44cdd8815 (patch) | |
| tree | 345ff9c60d43d8d3720053a25f855289cd9570ff /drivers/gpu/drm/omapdrm/omap_fbdev.c | |
| parent | x86/asm/memcpy_mcsafe: Add labels for __memcpy_mcsafe() write fault handling (diff) | |
| download | kernel-60622d68227d6d71fdfba5fb39f7f3d44cdd8815.tar.gz kernel-60622d68227d6d71fdfba5fb39f7f3d44cdd8815.zip | |
x86/asm/memcpy_mcsafe: Return bytes remaining
Machine check safe memory copies are currently deployed in the pmem
driver whenever reading from persistent memory media, so that -EIO is
returned rather than triggering a kernel panic. While this protects most
pmem accesses, it is not complete in the filesystem-dax case. When
filesystem-dax is enabled reads may bypass the block layer and the
driver via dax_iomap_actor() and its usage of copy_to_iter().
In preparation for creating a copy_to_iter() variant that can handle
machine checks, teach memcpy_mcsafe() to return the number of bytes
remaining rather than -EFAULT when an exception occurs.
Co-developed-by: Tony Luck <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/152539238119.31796.14318473522414462886.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'drivers/gpu/drm/omapdrm/omap_fbdev.c')
0 files changed, 0 insertions, 0 deletions