sent/20240813-seq_optimize-68c48696c798-v3

[PATCH] [PATCH] ARM64: Optimize seq operations

V1->V2
- Describe the benefit of load acquire vs barriers
- Explain the CONFIG_ARCH_HAS_ACQUIRE_RELEASE option better

Signed-off-by: Christoph Lameter (Ampere) <cl@gentwo.org>
To: Thomas Gleixner <tglx@linutronix.de>
To: Catalin Marinas <catalin.marinas@arm.com>
To: Will Deacon <will@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
To: Ingo Molnar <mingo@redhat.com>
To: Waiman Long <longman@redhat.com>
To: Boqun Feng <boqun.feng@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-arch@vger.kernel.org

---
Changes in v3:
- Support cond_load_acquire to give the processor a chance to do some
  sort of power down until cacheline changes.
- Better code by Thomas Gleixner
- Link to v2: https://lore.kernel.org/r/20240819-seq_optimize-v2-1-9d0da82b022f@gentwo.org

---
Christoph Lameter (Ampere) (1):
      Avoid memory barrier in read_seqcount() through load acquire

 arch/Kconfig            |  8 +++++
 arch/arm64/Kconfig      |  1 +
 include/linux/seqlock.h | 85 ++++++++++++++++++++++++++++++++++++-------------
 3 files changed, 71 insertions(+), 23 deletions(-)
---
base-commit: 77f587896757708780a7e8792efe62939f25a5ab
change-id: 20240813-seq_optimize-68c48696c798

Best regards,