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66a5c40f60
This patch creates wordpart.h and includes it in asm/word-at-a-time.h for all architectures. WORD_AT_A_TIME_CONSTANTS depends on kernel.h because of REPEAT_BYTE. Moving this to another header and including it where necessary allows us to not include the bloated kernel.h. Making this implicit dependency on REPEAT_BYTE explicit allows for later improvements in the lib/string.c inclusion list. Suggested-by: Al Viro <viro@zeniv.linux.org.uk> Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Tanzir Hasan <tanzirh@google.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20231226-libstringheader-v6-1-80aa08c7652c@google.com Signed-off-by: Kees Cook <keescook@chromium.org>
14 lines
352 B
C
14 lines
352 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_WORDPART_H
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#define _LINUX_WORDPART_H
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/**
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* REPEAT_BYTE - repeat the value @x multiple times as an unsigned long value
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* @x: value to repeat
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*
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* NOTE: @x is not checked for > 0xff; larger values produce odd results.
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*/
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#define REPEAT_BYTE(x) ((~0ul / 0xff) * (x))
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#endif // _LINUX_WORDPART_H
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