diff options
| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2019-08-16 07:52:20 +0000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-08-20 21:22:15 +1000 |
| commit | 7ab0b7cb8951d4095d73e203759b74d41916e455 (patch) | |
| tree | 4f63c162df91aa9231a46dcf1f4abc83b3cba0a5 /lib/random32.c | |
| parent | f204338f8e29777302042cba578b0da44f69695f (diff) | |
| download | blackbird-op-linux-7ab0b7cb8951d4095d73e203759b74d41916e455.tar.gz blackbird-op-linux-7ab0b7cb8951d4095d73e203759b74d41916e455.zip | |
powerpc/32: Add warning on misaligned copy_page() or clear_page()
copy_page() and clear_page() expect page aligned destination, and
use dcbz instruction to clear entire cache lines based on the
assumption that the destination is cache aligned.
As shown during analysis of a bug in BTRFS filesystem, a misaligned
copy_page() can create bugs that are difficult to locate (see Link).
Add an explicit WARNING when copy_page() or clear_page() are called
with misaligned destination.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=204371
Link: https://lore.kernel.org/r/c6cea38f90480268d439ca44a645647e260fff09.1565941808.git.christophe.leroy@c-s.fr
Diffstat (limited to 'lib/random32.c')
0 files changed, 0 insertions, 0 deletions
