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276b893049
Introduce arch_atomic64_try_cmpxchg() for 32-bit targets to use
optimized target specific implementation instead of a generic one.
This implementation eliminates dual-word compare after
cmpxchg8b instruction and improves generated asm code from:
2273: f0 0f c7 0f lock cmpxchg8b (%edi)
2277: 8b 74 24 2c mov 0x2c(%esp),%esi
227b: 89 d3 mov %edx,%ebx
227d: 89 c2 mov %eax,%edx
227f: 89 5c 24 10 mov %ebx,0x10(%esp)
2283: 8b 7c 24 30 mov 0x30(%esp),%edi
2287: 89 44 24 1c mov %eax,0x1c(%esp)
228b: 31 f2 xor %esi,%edx
228d: 89 d0 mov %edx,%eax
228f: 89 da mov %ebx,%edx
2291: 31 fa xor %edi,%edx
2293: 09 d0 or %edx,%eax
2295: 0f 85 a5 00 00 00 jne 2340 <...>
to:
2270: f0 0f c7 0f lock cmpxchg8b (%edi)
2274: 0f 85 a6 00 00 00 jne 2320 <...>
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/20240410062957.322614-1-ubizjak@gmail.com
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.