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| author | Mikulas Patocka <mpatocka@redhat.com> | 2022-08-26 22:43:51 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-08-27 18:49:54 +0200 |
| commit | d6ffe6067a54972564552ea45d320fb98db1ac5e (patch) | |
| tree | f5e9fe0bc2a8eaa1669802af515b91498ea806af /arch/hexagon | |
| parent | Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm6... (diff) | |
| download | linux-d6ffe6067a54972564552ea45d320fb98db1ac5e.tar.xz linux-d6ffe6067a54972564552ea45d320fb98db1ac5e.zip | |
provide arch_test_bit_acquire for architectures that define test_bit
Some architectures define their own arch_test_bit and they also need
arch_test_bit_acquire, otherwise they won't compile. We also clean up
the code by using the generic test_bit if that is equivalent to the
arch-specific version.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Fixes: 8238b4579866 ("wait_on_bit: add an acquire memory barrier")
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/hexagon')
| -rw-r--r-- | arch/hexagon/include/asm/bitops.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/hexagon/include/asm/bitops.h b/arch/hexagon/include/asm/bitops.h index da500471ac73..160d8f37fa1a 100644 --- a/arch/hexagon/include/asm/bitops.h +++ b/arch/hexagon/include/asm/bitops.h @@ -179,6 +179,21 @@ arch_test_bit(unsigned long nr, const volatile unsigned long *addr) return retval; } +static __always_inline bool +arch_test_bit_acquire(unsigned long nr, const volatile unsigned long *addr) +{ + int retval; + + asm volatile( + "{P0 = tstbit(%1,%2); if (P0.new) %0 = #1; if (!P0.new) %0 = #0;}\n" + : "=&r" (retval) + : "r" (addr[BIT_WORD(nr)]), "r" (nr % BITS_PER_LONG) + : "p0", "memory" + ); + + return retval; +} + /* * ffz - find first zero in word. * @word: The word to search |