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| author |   Akinobu Mita <mita@miraclelinux.com> | 2006-03-26 01:38:59 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-26 08:57:09 -0800 |
| commit | 93635133663ea3155e74a0e3645b64754a046007 (patch) | |
| tree | 6eb48fde8cc6a54d6b63ba160158f1b4688b337d /include/asm-arm/bitops.h | |
| parent | [PATCH] um: fix undefined reference to hweight32 (diff) | |
| download | linux-dev-93635133663ea3155e74a0e3645b64754a046007.tar.xz linux-dev-93635133663ea3155e74a0e3645b64754a046007.zip | |
[PATCH] arm: fix undefined reference to generic_fls
This patch defines constant_fls() instead of removed generic_fls().
Signed-off-by: Akinobu Mita <mita@miraclelinux.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to '')
| -rw-r--r-- | include/asm-arm/bitops.h | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/include/asm-arm/bitops.h b/include/asm-arm/bitops.h index d02de721ecc1..eaecd553e856 100644 --- a/include/asm-arm/bitops.h +++ b/include/asm-arm/bitops.h @@ -344,13 +344,42 @@ static inline unsigned long __ffs(unsigned long word) #else +static inline int constant_fls(int x) +{ + int r = 32; + + if (!x) + return 0; + if (!(x & 0xffff0000u)) { + x <<= 16; + r -= 16; + } + if (!(x & 0xff000000u)) { + x <<= 8; + r -= 8; + } + if (!(x & 0xf0000000u)) { + x <<= 4; + r -= 4; + } + if (!(x & 0xc0000000u)) { + x <<= 2; + r -= 2; + } + if (!(x & 0x80000000u)) { + x <<= 1; + r -= 1; + } + return r; +} + /* * On ARMv5 and above those functions can be implemented around * the clz instruction for much better code efficiency. */ #define fls(x) \ - ( __builtin_constant_p(x) ? generic_fls(x) : \ + ( __builtin_constant_p(x) ? constant_fls(x) : \ ({ int __r; asm("clz\t%0, %1" : "=r"(__r) : "r"(x) : "cc"); 32-__r; }) ) #define fls64(x) generic_fls64(x) #define ffs(x) ({ unsigned long __t = (x); fls(__t & -__t); }) |