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gpu: nvgpu: posix: Fix ffs() and fls() impl in POSIX

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The GCC builtins act slightly differently than the Linux versions
of these functions. This patch adds the necessary glue to emulate
the Linux versions identically.

JIRA NVGPU-525

Change-Id: Idadbecdfd516c68f3d3eb20eca495dc1eaa02c5b
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1741951
GVS: Gerrit_Virtual_Submit
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Alex Waterman
2018-05-30 09:16:06 -07:00
committed by mobile promotions
parent 0b0b820911
commit 2ac6fb4253
1 changed files with 7 additions and 6 deletions
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13
drivers/gpu/nvgpu/common/posix/bitmap.c
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@@ -29,14 +29,15 @@
#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
unsigned long __nvgpu_posix_fls(unsigned long word)
{
return __builtin_clzl(word);
}
unsigned long __nvgpu_posix_ffs(unsigned long word)
{
return __builtin_ffsl(word);
return (__builtin_ffsl(word) - 1) &
((sizeof(unsigned long) * 8UL) - 1UL);
}
unsigned long __nvgpu_posix_fls(unsigned long word)
{
return ((sizeof(unsigned long) * 8UL) - 1UL) - __builtin_clzl(word);
}
static unsigned long __find_next_bit(const unsigned long *addr,