From 8a6d48c0542876eb3acfc0970c0ab7872db08d5f Mon Sep 17 00:00:00 2001 From: Zheng Da Date: Sun, 6 Dec 2009 05:26:23 +0100 Subject: check in the original version of dde linux26. --- .../contrib/include/asm-generic/bitops/fls.h | 41 ++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 libdde_linux26/contrib/include/asm-generic/bitops/fls.h (limited to 'libdde_linux26/contrib/include/asm-generic/bitops/fls.h') diff --git a/libdde_linux26/contrib/include/asm-generic/bitops/fls.h b/libdde_linux26/contrib/include/asm-generic/bitops/fls.h new file mode 100644 index 00000000..0576d1f4 --- /dev/null +++ b/libdde_linux26/contrib/include/asm-generic/bitops/fls.h @@ -0,0 +1,41 @@ +#ifndef _ASM_GENERIC_BITOPS_FLS_H_ +#define _ASM_GENERIC_BITOPS_FLS_H_ + +/** + * fls - find last (most-significant) bit set + * @x: the word to search + * + * This is defined the same way as ffs. + * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32. + */ + +static __always_inline int 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; +} + +#endif /* _ASM_GENERIC_BITOPS_FLS_H_ */ -- cgit v1.2.3