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| author | Ilia Mirkin <imirkin@alum.mit.edu> | 2014-02-10 00:51:24 +0400 |
|---|---|---|
| committer | Ben Skeggs <bskeggs@redhat.com> | 2014-03-26 07:59:31 +0400 |
| commit | 73970c47beb42f3e1ab0b86c537b1c79539f05f4 (patch) | |
| tree | db0e30783fe20810e97265d75ff3452db18195f0 /drivers/gpu/drm/nouveau/nouveau_abi16.c | |
| parent | 0ac4e3a58d58e33b2353b3e187c88b9485f26591 (diff) | |
| download | linux-73970c47beb42f3e1ab0b86c537b1c79539f05f4.tar.xz | |
drm/nouveau: replace ffsll with __ffs64
The ffsll function is a lot slower than the __ffs64 built-in which
compiles to a single instruction on 64-bit. It's also nice to avoid
custom versions of standard functions. Note that __ffs == ffs - 1.
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_abi16.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_abi16.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_abi16.c b/drivers/gpu/drm/nouveau/nouveau_abi16.c index 900fae01793e..b70111711be3 100644 --- a/drivers/gpu/drm/nouveau/nouveau_abi16.c +++ b/drivers/gpu/drm/nouveau/nouveau_abi16.c @@ -270,8 +270,8 @@ nouveau_abi16_ioctl_channel_alloc(ABI16_IOCTL_ARGS) return nouveau_abi16_put(abi16, -EINVAL); /* allocate "abi16 channel" data and make up a handle for it */ - init->channel = ffsll(~abi16->handles); - if (!init->channel--) + init->channel = __ffs64(~abi16->handles); + if (~abi16->handles == 0) return nouveau_abi16_put(abi16, -ENOSPC); chan = kzalloc(sizeof(*chan), GFP_KERNEL); |