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| author | Alexander Lobakin <alexandr.lobakin@intel.com> | 2022-06-24 15:13:08 +0300 |
|---|---|---|
| committer | Yury Norov <yury.norov@gmail.com> | 2022-07-01 05:52:41 +0300 |
| commit | bb7379bfa680bd48b468e856475778db2ad866c1 (patch) | |
| tree | 83565d30d7fb5f3da1a099cb2b3192d9d7a6088f /include/linux/bitops.h | |
| parent | 0e862838f290147ea9c16db852d8d494b552d38d (diff) | |
| download | linux-bb7379bfa680bd48b468e856475778db2ad866c1.tar.xz | |
bitops: define const_*() versions of the non-atomics
Define const_*() variants of the non-atomic bitops to be used when
the input arguments are compile-time constants, so that the compiler
will be always able to resolve those to compile-time constants as
well. Those are mostly direct aliases for generic_*() with one
exception for const_test_bit(): the original one is declared
atomic-safe and thus doesn't discard the `volatile` qualifier, so
in order to let optimize code, define it separately disregarding
the qualifier.
Add them to the compile-time type checks as well just in case.
Suggested-by: Marco Elver <elver@google.com>
Signed-off-by: Alexander Lobakin <alexandr.lobakin@intel.com>
Reviewed-by: Marco Elver <elver@google.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
Diffstat (limited to 'include/linux/bitops.h')
| -rw-r--r-- | include/linux/bitops.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/bitops.h b/include/linux/bitops.h index 87087454a288..d393297287d5 100644 --- a/include/linux/bitops.h +++ b/include/linux/bitops.h @@ -37,6 +37,7 @@ extern unsigned long __sw_hweight64(__u64 w); /* Check that the bitops prototypes are sane */ #define __check_bitop_pr(name) \ static_assert(__same_type(arch_##name, generic_##name) && \ + __same_type(const_##name, generic_##name) && \ __same_type(name, generic_##name)) __check_bitop_pr(__set_bit); |