Re: [PATCH v4 2/5] x86,entry: Only call user_exit if TIF_NOHZ
From: Oleg Nesterov
Date: Thu Jul 31 2014 - 13:00:33 EST
On 07/31, Oleg Nesterov wrote:
> On 07/31, Frederic Weisbecker wrote:
> > On Thu, Jul 31, 2014 at 06:42:46PM +0200, Oleg Nesterov wrote:
> > >
> > > And if we change this, then the code above becomes racy. The state of
> > > TIF_XYZ can be changed right after the check. OK, it is racy anyway ;)
> > > but still this adds more confusion.
> > No because all running tasks have this flag set when context tracking is
> > enabled. And context tracking can't be disabled on runtime.
> Yes, yes, please note that I said "if we change this".
And "it is racy anyway" connects to the problems we discuss in another
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