Messages in this thread Patch in this message |  | | | Date | Tue, 21 Feb 2006 12:46:34 +0900 | | From | Akinobu Mita <> | | Subject | [-mm patch 6/8] arm: fix undefined reference to generic_fls |
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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>
include/asm-arm/bitops.h | 31 ++++++++++++++++++++++++++++++- 1 files changed, 30 insertions(+), 1 deletion(-) Index: 2.6-mm/include/asm-arm/bitops.h =================================================================== --- 2.6-mm.orig/include/asm-arm/bitops.h +++ 2.6-mm/include/asm-arm/bitops.h @@ -239,13 +239,42 @@ extern int _find_next_bit_be(const unsig #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 ffs(x) ({ unsigned long __t = (x); fls(__t & -__t); }) #define __ffs(x) (ffs(x) - 1) -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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