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drm/nouveau: replace ffsll with __ffs64

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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>
This commit is contained in:
Ilia Mirkin 2014-02-09 15:51:24 -05:00 committed by Ben Skeggs
parent 0ac4e3a58d
commit 73970c47be
2 changed files with 3 additions and 3 deletions
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2
drivers/gpu/drm/nouveau/core/core/parent.c
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@ -49,7 +49,7 @@ nouveau_parent_sclass(struct nouveau_object *parent, u16 handle,
mask = nv_parent(parent)->engine;
while (mask) {
int i = ffsll(mask) - 1;
int i = __ffs64(mask);
if (nv_iclass(parent, NV_CLIENT_CLASS))
engine = nv_engine(nv_client(parent)->device);

4
drivers/gpu/drm/nouveau/nouveau_abi16.c
View File

@ -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);