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author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2019-07-17 02:26:57 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-07-17 05:23:22 +0300 |
commit | 95b980d62d52c4c1768ee719e8db3efe27ef52b2 (patch) | |
tree | f358ac87dee827a037aa8fd538b328b347490108 /crypto/md4.c | |
parent | 65f50f255349959f15f2761abd17ead8530b2f33 (diff) | |
download | linux-95b980d62d52c4c1768ee719e8db3efe27ef52b2.tar.xz |
linux/bits.h: make BIT(), GENMASK(), and friends available in assembly
BIT(), GENMASK(), etc. are useful to define register bits of hardware.
However, low-level code is often written in assembly, where they are
not available due to the hard-coded 1UL, 0UL.
In fact, in-kernel headers such as arch/arm64/include/asm/sysreg.h
use _BITUL() instead of BIT() so that the register bit macros are
available in assembly.
Using macros in include/uapi/linux/const.h have two reasons:
[1] For use in uapi headers
We should use underscore-prefixed variants for user-space.
[2] For use in assembly code
Since _BITUL() uses UL(1) instead of 1UL, it can be used as an
alternative of BIT().
For [2], it is pretty easy to change BIT() etc. for use in assembly.
This allows to replace _BUTUL() in kernel-space headers with BIT().
Link: http://lkml.kernel.org/r/20190609153941.17249-1-yamada.masahiro@socionext.com
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'crypto/md4.c')
0 files changed, 0 insertions, 0 deletions