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author | Paul Burton <paul.burton@imgtec.com> | 2017-06-10 02:26:33 +0200 |
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committer | Ralf Baechle <ralf@linux-mips.org> | 2017-06-29 02:42:24 +0200 |
commit | 6b1e76297c4ad4b906fdf054460e4e56914f6e34 (patch) | |
tree | d3c1dafa830dc078f8222b3ac3d04a11771dd063 /certs | |
parent | MIPS: unaligned: Add DSP lwx & lhx missaligned access support (diff) | |
download | linux-6b1e76297c4ad4b906fdf054460e4e56914f6e34.tar.xz linux-6b1e76297c4ad4b906fdf054460e4e56914f6e34.zip |
MIPS: cmpxchg: Unify R10000_LLSC_WAR & non-R10000_LLSC_WAR cases
Prior to this patch the xchg & cmpxchg functions have duplicated code
which is for all intents & purposes identical apart from use of a
branch-likely instruction in the R10000_LLSC_WAR case & a regular branch
instruction in the non-R10000_LLSC_WAR case.
This patch removes the duplication, declaring a __scbeqz macro to select
the branch instruction suitable for use when checking the result of an
sc instruction & making use of it to unify the 2 cases.
In __xchg_u{32,64}() this means writing the branch in asm, where it was
previously being done in C as a do...while loop for the
non-R10000_LLSC_WAR case. As this is a single instruction, and adds
consistency with the R10000_LLSC_WAR cases & the cmpxchg() code, this
seems worthwhile.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16348/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'certs')
0 files changed, 0 insertions, 0 deletions