| commit | 7ab0b7cb8951d4095d73e203759b74d41916e455 | [log] [tgz] |
|---|---|---|
| author | Christophe Leroy <christophe.leroy@c-s.fr> | Fri Aug 16 07:52:20 2019 +0000 |
| committer | Michael Ellerman <mpe@ellerman.id.au> | Tue Aug 20 21:22:15 2019 +1000 |
| tree | 4f63c162df91aa9231a46dcf1f4abc83b3cba0a5 | |
| parent | f204338f8e29777302042cba578b0da44f69695f [diff] |
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