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549042f167
To pick the changes in:
6606c8c7e8188656 ("bitops: Add __attribute_const__ to generic ffs()-family implementations")
This addresses these tools build warnings:
Warning: Kernel ABI header differences:
diff -u tools/include/asm-generic/bitops/__fls.h include/asm-generic/bitops/__fls.h
diff -u tools/include/asm-generic/bitops/fls.h include/asm-generic/bitops/fls.h
diff -u tools/include/asm-generic/bitops/fls64.h include/asm-generic/bitops/fls64.h
Please see tools/include/uapi/README for further details.
Cc: Kees Cook <kees@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
47 lines
781 B
C
47 lines
781 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_GENERIC_BITOPS_FLS_H_
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#define _ASM_GENERIC_BITOPS_FLS_H_
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/**
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* generic_fls - find last (most-significant) bit set
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* @x: the word to search
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*
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* This is defined the same way as ffs.
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* Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
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*/
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static __always_inline __attribute_const__ int generic_fls(unsigned int x)
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{
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int r = 32;
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if (!x)
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return 0;
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if (!(x & 0xffff0000u)) {
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x <<= 16;
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r -= 16;
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}
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if (!(x & 0xff000000u)) {
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x <<= 8;
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r -= 8;
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}
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if (!(x & 0xf0000000u)) {
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x <<= 4;
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r -= 4;
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}
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if (!(x & 0xc0000000u)) {
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x <<= 2;
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r -= 2;
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}
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if (!(x & 0x80000000u)) {
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x <<= 1;
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r -= 1;
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}
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return r;
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}
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#ifndef __HAVE_ARCH_FLS
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#define fls(x) generic_fls(x)
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#endif
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#endif /* _ASM_GENERIC_BITOPS_FLS_H_ */
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