tree 6832dfcb836f8d5043ba70f17a0ea9c2c428bc4d
parent 319720f534d88039615bceb88d4bc094a7cd4ce9
author Will Deacon <will.deacon@arm.com> 1386870021 +0000
committer Linus Torvalds <torvalds@linux-foundation.org> 1386873541 -0800

dcache: allow word-at-a-time name hashing with big-endian CPUs

When explicitly hashing the end of a string with the word-at-a-time
interface, we have to be careful which end of the word we pick up.

On big-endian CPUs, the upper-bits will contain the data we're after, so
ensure we generate our masks accordingly (and avoid hashing whatever
random junk may have been sitting after the string).

This patch adds a new dcache helper, bytemask_from_count, which creates
a mask appropriate for the CPU endianness.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>