linux-kernel - [PATCH v2 0/2] arm64: Only call into preempt_schedule() if need

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Date:   Fri, 30 Nov 2018 17:34:29 +0000
From:   Will Deacon <will.deacon@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, ard.biesheuvel@...aro.org,
        catalin.marinas@....com, rml@...h9.net, tglx@...utronix.de,
        peterz@...radead.org, schwidefsky@...ibm.com,
        Will Deacon <will.deacon@....com>
Subject: [PATCH v2 0/2] arm64: Only call into preempt_schedule() if need_resched()

Hi all,

This is version two of the patches I originally posted here:

  http://lkml.kernel.org/r/1543347902-21170-1-git-send-email-will.deacon@arm.com

The only change since v1 is that  __preempt_count_dec_and_test() now
reloads the need_resched flag if it initially saw that it was set. This
resolves the issue spotted by Peter, where an IRQ coming in during the
decrement can cause a reschedule to be missed.

Feedback welcome.

Will

--->8

Will Deacon (2):
  preempt: Move PREEMPT_NEED_RESCHED definition into arch code
  arm64: preempt: Provide our own implementation of asm/preempt.h

 arch/arm64/include/asm/Kbuild        |  1 -
 arch/arm64/include/asm/preempt.h     | 88 ++++++++++++++++++++++++++++++++++++
 arch/arm64/include/asm/thread_info.h | 13 +++++-
 arch/s390/include/asm/preempt.h      |  2 +
 arch/x86/include/asm/preempt.h       |  3 ++
 include/linux/preempt.h              |  3 --
 6 files changed, 105 insertions(+), 5 deletions(-)
 create mode 100644 arch/arm64/include/asm/preempt.h

-- 
2.1.4