linux-kernel - Re: [PATCH] rt: x86: extend signal send delay to 32 bit

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Date:	Sat, 12 Dec 2015 15:35:36 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Shi, Yang" <yang.shi@...aro.org>
cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	rostedt@...dmis.org, linux-kernel@...r.kernel.org,
	linux-rt-users@...r.kernel.org, linaro-kernel@...ts.linaro.org
Subject: Re: [PATCH] rt: x86: extend signal send delay to 32 bit

On Fri, 11 Dec 2015, Shi, Yang wrote:
> On 12/11/2015 10:05 AM, Sebastian Andrzej Siewior wrote:
> > * Yang Shi | 2015-12-10 10:58:51 [-0800]:
> > > Signal send delay is just available for x86-64, x86-32 needs it too.
> > 
> > This is new, this was not the case earlier. New means since v4.0-rc1 which
> 
> Yes, it is. We didn't find this problem in earlier version kernel (I'd say
> 3.x).
> 
> > is when 959274753857 ("x86, traps: Track entry into and exit from IST
> > context") got merged.
> > Since now ist_enter() disables preemption in any case, our hacks to
> > conditional_sti_ist() are pointless and could be removed.
> 
> I'm supposed you will revert it and not need a revert patch from me.

Why do you think that reverting it is a good idea? Just because we can
or what?

No, we fix it up on the RT side.

Thanks,

	tglx
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