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| author | Tanzir Hasan <tanzirh@google.com> | 2023-12-26 18:00:00 +0000 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2024-02-01 09:47:59 -0800 |
| commit | 66a5c40f60f5d88ad8d47ba6a4ba05892853fa1f (patch) | |
| tree | 63ee4c0ec6e43b5890cd0e0f168f8100e254c5b3 /include/linux/wordpart.h | |
| parent | 735b7636d1a88e85eeef607a8179a114618bc5a0 (diff) | |
| download | lwn-66a5c40f60f5d88ad8d47ba6a4ba05892853fa1f.tar.gz lwn-66a5c40f60f5d88ad8d47ba6a4ba05892853fa1f.zip | |
kernel.h: removed REPEAT_BYTE from kernel.h
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>
Diffstat (limited to 'include/linux/wordpart.h')
| -rw-r--r-- | include/linux/wordpart.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/wordpart.h b/include/linux/wordpart.h new file mode 100644 index 000000000000..c9e6bd773ebd --- /dev/null +++ b/include/linux/wordpart.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef _LINUX_WORDPART_H +#define _LINUX_WORDPART_H +/** + * REPEAT_BYTE - repeat the value @x multiple times as an unsigned long value + * @x: value to repeat + * + * NOTE: @x is not checked for > 0xff; larger values produce odd results. + */ +#define REPEAT_BYTE(x) ((~0ul / 0xff) * (x)) + +#endif // _LINUX_WORDPART_H |