linux-kernel - Re: preempt_schedule

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Date:   Wed, 16 Jan 2019 15:23:28 +0000
From:   Valentin Schneider <valentin.schneider@....com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Julien Thierry <julien.thierry@....com>
Subject: Re: preempt_schedule_irq() loop question

On 16/01/2019 14:57, Thomas Gleixner wrote:
[...]
> 
> I just went back in the history tree and had to figure out that it's my
> fault :)
> 
> preempt_schedule_irq() was introduced to plug a stupid race, but I did not
> notice (and obviously nobody else) that this made the extra loop in the
> entry code pointless. So it's just histerical raisins without any value.
> 

I see, thanks for clearing that up! Credit goes to Julien & Will for
unearthing the oddity.

> Thanks,
> 
> 	tglx
>