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authorUros Bizjak <ubizjak@gmail.com>2024-06-05 20:13:15 +0200
committerIngo Molnar <mingo@kernel.org>2024-07-17 16:28:11 +0200
commit6e30a7c98a9fda2f894e970e9cd637657f39c59d (patch)
tree70618796d6d3dfe48fe0b236febfb5e60d0e3982 /fs
parent51835949dda3783d4639cfa74ce13a3c9829de00 (diff)
locking/atomic/x86: Introduce the read64_nonatomic macro to x86_32 with cx8
As described in commit: e73c4e34a0e9 ("locking/atomic/x86: Introduce arch_atomic64_read_nonatomic() to x86_32") the value preload before the CMPXCHG loop does not need to be atomic. Introduce the read64_nonatomic assembly macro to load the value from a atomic_t location in a faster non-atomic way and use it in atomic64_cx8_32.S. Signed-off-by: Uros Bizjak <ubizjak@gmail.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/20240605181424.3228-1-ubizjak@gmail.com
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