kernel/linux.git/include/linux/wordpart.h, branch v6.12.80Linux kernel stable tree (mirror)https://git.radix-linux.su/kernel/linux.git/atom?h=v6.12.802024-06-24T17:16:44+00:00wordpart.h: Add REPEAT_BYTE_U32()2024-06-24T17:16:44+00:00Mark Rutlandmark.rutland@arm.com2024-06-17T11:18:37+00:00urn:sha1:118d777c4cb40f44e7b675955fd2da8b22f83913
In some cases it's necessary to replicate a byte across a u32 value, for
which REPEAT_BYTE() would be helpful. Currently this requires explicit
masking of the result to avoid sparse warnings, as e.g.
(u32)REPEAT_BYTE(0xa0))
... will result in a warning:
cast truncates bits from constant value (a0a0a0a0a0a0a0a0 becomes a0a0a0a0)
Add a new REPEAT_BYTE_U32() which does the necessary masking internally,
so that we don't need to duplicate this for every usage.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Alexandru Elisei <alexandru.elisei@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20240617111841.2529370-2-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
bitops: Move aligned_byte_mask() to wordpart.h2024-05-19T23:12:38+00:00Andy Shevchenkoandriy.shevchenko@linux.intel.com2024-05-07T20:01:31+00:00urn:sha1:9f2c2d6ba13da08643c65b948ce5e3d616864c47
The bitops.h is for bit related operations. The aligned_byte_mask()
is about byte (or part of the machine word) operations, for which
we have a separate header, move the mentioned macro to wordpart.h
to consolidate similar operations.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
kernel.h: Move upper_*_bits() and lower_*_bits() to wordpart.h2024-02-29T21:38:01+00:00Andy Shevchenkoandriy.shevchenko@linux.intel.com2024-02-14T17:26:32+00:00urn:sha1:adeb04362d74188c1e22ccb824b15a0a7b3de2f4
The wordpart.h header is collecting APIs related to the handling
parts of the word (usually in byte granularity). The upper_*_bits()
and lower_*_bits() are good candidates to be moved to there.
This helps to clean up header dependency hell with regard to kernel.h
as the latter gathers completely unrelated stuff together and slows
down compilation (especially when it's included into other header).
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240214172752.3605073-1-andriy.shevchenko@linux.intel.com
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
kernel.h: removed REPEAT_BYTE from kernel.h2024-02-01T17:47:59+00:00Tanzir Hasantanzirh@google.com2023-12-26T18:00:00+00:00urn:sha1:66a5c40f60f5d88ad8d47ba6a4ba05892853fa1f
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>