linux-kernel - Re: [PATCH] powerpc/non-smp: Inconditionaly call smp_mb() on switch

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Date:   Wed, 18 Aug 2021 23:38:38 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc/non-smp: Inconditionaly call smp_mb() on switch_mm

On Mon, 5 Jul 2021 12:00:50 +0000 (UTC), Christophe Leroy wrote:
> Commit 3ccfebedd8cf ("powerpc, membarrier: Skip memory barrier in
> switch_mm()") added some logic to skip the smp_mb() in
> switch_mm_irqs_off() before the call to switch_mmu_context().
> 
> However, on non SMP smp_mb() is just a compiler barrier and doing
> it inconditionaly is simpler than the logic used to check
> whether the barrier is needed or not.
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/non-smp: Inconditionaly call smp_mb() on switch_mm
      https://git.kernel.org/powerpc/c/c8a6d91005343dea0d53be0ff0620c66934dcd44

cheers