Messages in this thread | | | From | Uros Bizjak <> | Subject | [PATCH 0/3] locking/atomic/x86: Improve arch_cmpxchg64() and friends for x86_32 | Date | Mon, 8 Apr 2024 11:13:55 +0200 |
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Following patch series improves arch_cmpxchg64() family of functions and rewrites arch_cmpxchg64() family in a similar way as was recently done for arch_cmpxchg128() family.
The improvements builds on recent improvement of emulated cmpxchg8b_emu() library function and introduce arch_try_cmpxchg64() also for !CONFIG_X86_CMPXCHG64 targets.
While the patch series enables impressive assembly code reductions for somehow obsolete !CONFIG_X86_CMPXCHG64 targets, the true reason for the changes will be evident from the follow-up patch series, where this series enables unification of several atomic functions between x86_64 and x86_32 targets.
OTOH, by adopting the same approach and similar structure of arch_cmpxchg64() macros to arch_cmpxchg128() macros, these patches lower future maintenace burden and technical debt of the source code.
Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Peter Zijlstra <peterz@infradead.org>
Uros Bizjak (3): locking/atomic/x86: Correct the definition of __arch_try_cmpxchg128() locking/atomic/x86: Modernize x86_32 arch_{,try_}_cmpxchg64{,_local}() locking/atomic/x86: Introduce arch_try_cmpxchg64() for !CONFIG_X86_CMPXCHG64
arch/x86/include/asm/cmpxchg_32.h | 207 ++++++++++++++++++------------ arch/x86/include/asm/cmpxchg_64.h | 2 +- 2 files changed, 129 insertions(+), 80 deletions(-)
-- 2.44.0
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