linux-kernel - Re: [PATCH 10/10] softirq: Remove __ARCH_SET_SOFTIRQ

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Message-ID: <20180329180836.GS4082@hirez.programming.kicks-ass.net>
Date:   Thu, 29 Mar 2018 20:08:36 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Tony Luck <tony.luck@...el.com>,
        "David S . Miller" <davem@...emloft.net>,
        Michael Ellerman <mpe@...erman.id.au>,
        Helge Deller <deller@....de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Fenghua Yu <fenghua.yu@...el.com>,
        "James E . J . Bottomley" <jejb@...isc-linux.org>,
        heiko.carstens@...ibm.com
Subject: Re: [PATCH 10/10] softirq: Remove __ARCH_SET_SOFTIRQ_PENDING

On Thu, Mar 29, 2018 at 04:53:43PM +0200, Martin Schwidefsky wrote:
> The lowcore optimization for softirq_pending field is not really needed,
> just nice to have. But if there is a strong reason to make a common
> definition for it we can certainly do that.

A slightly related question; would it make sense to move all kernel
static per-cpu stuff into lowcore, or is that asking for too much
trickery?