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

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Message-ID: <20180329140748.GB12958@lerouge>
Date:   Thu, 29 Mar 2018 16:07:49 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     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>,
        schwidefsky@...ibm.com, heiko.carstens@...ibm.com
Subject: Re: [PATCH 10/10] softirq: Remove __ARCH_SET_SOFTIRQ_PENDING

On Thu, Mar 29, 2018 at 04:01:11PM +0200, Peter Zijlstra wrote:
> On Thu, Mar 29, 2018 at 03:47:46PM +0200, Frederic Weisbecker wrote:
> > On Thu, Mar 29, 2018 at 09:16:19AM +0200, Peter Zijlstra wrote:
> > > On Thu, Mar 29, 2018 at 04:27:05AM +0200, Frederic Weisbecker wrote:
> > > > The last user of __ARCH_SET_SOFTIRQ_PENDING has been converted to generic
> > > > per-cpu softirq mask. We can now remove this conditional.
> > > 
> > > This seems like half a cleanup; who still has local_softirq_pending()
> > > after this?
> > 
> > Only s390 because it uses lowcore to store such cpu data.
> 
> Is it worth keeping it there? It seems an aweful shame to keep this
> stuff special cased for just the one arch. At the very least this
> should've mentioned s390 is special and why.

Right, I thought well about moving that special case to s390. I can
do that in v2.

> 
> And I don't see s390 people on Cc either.

Oops, forgot to add them.

Thanks.