linux-kernel - Re: [GIT pull] irq fixes for 4.8

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Message-ID: <alpine.DEB.2.20.1609190914480.5618@nanos>
Date:   Mon, 19 Sep 2016 09:16:47 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
cc:     LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [GIT pull] irq fixes for 4.8

On Sun, 18 Sep 2016, Linus Torvalds wrote:
> On Sun, Sep 18, 2016 at 1:05 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> >
> > Boris Brezillon (2):
> >       genirq: Provide irq_gc_{lock_irqsave,unlock_irqrestore}() helpers
> 
> This seems somewhat questionable.
> 
> The non-irqsafe versions of these functions have specialized non-SMP
> versions for them. The new ones don't.
> 
> I pulled it, because I think it's actually the old versions that are
> garbage (the locking should become a no-op on UP regardless - except
> for the preemption issue which I don't see why it wouldn't be real),
> but I think this is inconsistent and should be fixed (or a comment
> added about why it is ok).

Yes, it lacks a comment. The reason why the non save versions are empty is
that these primitives are solely used in the irq chip hotpath functions. UP
folks wanted to avoid the preempt disable/enable in these anyway interrupt
disabled contexts.

Thanks,

	tglx