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| author |   Heiko Carstens <heiko.carstens@de.ibm.com> | 2013-09-10 15:35:39 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-10-24 17:16:44 +0200 |
| commit | e344e52c7c6d6ab277daa83211972f801af2f9af (patch) | |
| tree | c54a58bdbf4bd586668e288dda2163ebf899a83c /arch/s390/Makefile | |
| parent | Merge tag 'md/3.12-fixes' of git://neil.brown.name/md (diff) | |
| download | linux-dev-e344e52c7c6d6ab277daa83211972f801af2f9af.tar.xz linux-dev-e344e52c7c6d6ab277daa83211972f801af2f9af.zip | |
s390/bitops: make use of interlocked-access facility 1 instructions
Make use of the interlocked-access facility 1 that got added with the
z196 architecure.
This facilility added new instructions which can atomically update a
storage location without a compare-and-swap loop. E.g. setting a bit
within a "long" can be done with a single instruction.
The size of the kernel image gets ~30kb smaller. Considering that there
are appr. 1900 bitops call sites this means that each one saves about
15-16 bytes per call site which is expected.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/Makefile')
0 files changed, 0 insertions, 0 deletions