linux-kernel - Re: Do we need to disable preemption in flush_tlb

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Date:   Wed, 14 Mar 2018 19:15:11 +0000
From:   Alexey Brodkin <Alexey.Brodkin@...opsys.com>
To:     Vineet Gupta <Vineet.Gupta1@...opsys.com>
CC:     "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
Subject: Re: Do we need to disable preemption in flush_tlb_range()?

Ping!

On Thu, 2018-03-01 at 18:13 +0300, Alexey Brodkin wrote:
> Hi Vineet,
> 
> Just noticed that in comments for smp_call_function_many() it is said that
> preemption must be disabled during its execution. And that function gets executed
> among other ways like that:
> -------------------------->8-----------------------
>   flush_tlb_range()
>     -> on_each_cpu_mask()
>          -> smp_call_function_many()
> -------------------------->8-----------------------
> 
> I'm not seeing right now any real problem with current implementation but
> some architectures do that thus the question.
> 
> -Alexey