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| author |  Anton Blanchard <anton@samba.org>
| 2012-02-29 21:12:16 +0000 |
|---|---|---|
| committer |  Benjamin Herrenschmidt <benh@kernel.crashing.org>
| 2012-03-07 17:06:08 +1100 |
| commit | a6cf7ed5119fb22f54584a9f867b638edd3c4384 (patch) | |
| tree | 5a81f3e6cf92caa6e806e2a5b945406902e63e07 /arch/powerpc/mm | |
| parent | atomic: Allow atomic_inc_not_zero to be overridden (diff) | |
| download | linux-a6cf7ed5119fb22f54584a9f867b638edd3c4384.tar.gz linux-a6cf7ed5119fb22f54584a9f867b638edd3c4384.tar.bz2 linux-a6cf7ed5119fb22f54584a9f867b638edd3c4384.zip | |
powerpc/atomic: Implement atomic*_inc_not_zero
Implement atomic_inc_not_zero and atomic64_inc_not_zero. At the
moment we use atomic*_add_unless which requires us to put 0 and
1 constants into registers. We can also avoid a subtract by
saving the original value in a second temporary.
This removes 3 instructions from fget:
- c0000000001b63c0: 39 00 00 00 li r8,0
- c0000000001b63c4: 39 40 00 01 li r10,1
...
- c0000000001b63e8: 7c 0a 00 50 subf r0,r10,r0
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm')
0 files changed, 0 insertions, 0 deletions