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9c313ccdfc
Change the return types of bitops functions (ffs, fls, and fns) from long to int. The expected return values are in the range [0, 64], for which int is sufficient. Additionally, int aligns well with the return types of the corresponding __builtin_* functions, potentially reducing overall type conversions. Many of the existing bitops functions already return an int and don't need to be changed. The bitops functions in arch/ should be considered separately. Adjust some return variables to match the function return types. With GCC 13 and defconfig, these changes reduced the size of a test kernel image by 5,432 bytes on arm64 and by 248 bytes on riscv; there were no changes in size on x86_64, powerpc, or m68k. Signed-off-by: Thorsten Blum <thorsten.blum@toblux.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
17 lines
378 B
C
17 lines
378 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_GENERIC_BITOPS_BUILTIN___FFS_H_
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#define _ASM_GENERIC_BITOPS_BUILTIN___FFS_H_
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/**
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* __ffs - find first bit in word.
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* @word: The word to search
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*
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* Undefined if no bit exists, so code should check against 0 first.
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*/
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static __always_inline unsigned int __ffs(unsigned long word)
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{
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return __builtin_ctzl(word);
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}
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#endif
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