linux-kernel - Re: [PATCH 1/1] arm64: Use _rcuidle for smp_cross

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Message-ID: <20190213131924.GD5875@brain-police>
Date:   Wed, 13 Feb 2019 13:19:25 +0000
From:   Will Deacon <will.deacon@....com>
To:     Mars Cheng <mars.cheng@...iatek.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        CC Hwang <cc.hwang@...iatek.com>,
        Loda Chou <loda.chou@...iatek.com>,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, wsd_upstream@...iatek.com
Subject: Re: [PATCH 1/1] arm64: Use _rcuidle for smp_cross_call() tracepoints

On Tue, Feb 12, 2019 at 07:09:25PM +0800, Mars Cheng wrote:
> fix similar issue for aarch64 as the commit 7c64cc0531fa
> ("arm: Use _rcuidle for smp_cross_call() tracepoints") fixed
> in aarch32

I'm not convinced about this justification. As far as I can tell, the commit
mentioned above fixed a cross-call from the idle path as a result of
ARCH_NEEDS_CPU_IDLE_COUPLED, but this never appears to be selected on arm64
afaict.

Are you actually seeing a problem on arm64 in practice?

Will