linux-kernel - Re: [PATCH 0/5] ia64 ski emulator patches

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Message-ID: <21220.10175.311714.796806@gargle.gargle.HOWL>
Date:	Sat, 25 Jan 2014 22:08:15 +0100
From:	Mikael Pettersson <mikpelinux@...il.com>
To:	Mikulas Patocka <mpatocka@...hat.com>
Cc:	Mikael Pettersson <mikpelinux@...il.com>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>, linux-ia64@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] ia64 ski emulator patches

Mikulas Patocka writes:
 > 
 > 
 > On Sat, 25 Jan 2014, Mikael Pettersson wrote:
 > 
 > > My ski patches are in <http://user.it.uu.se/~mikpe/linux/patches/ia64/ski-1.3.2/>
 > > for now.  I'll post the kernel patches to linux-ia64 @ vger in a few minutes.
 > > 
 > > /Mikael
 > 
 > Thanks for the patches.
 > 
 > Isn't this subject to races? - could it lock up if the signal happens just 
 > before the pause syscall?
 > 
 > +    case SSC_HALT_LIGHT:
 > +      /* Sleep until SIGIO or SIGALRM is received; this relies on
 > +        keyboard/ethernet input being detected via SIGIO, and the
 > +        ITC now being emulated via setitimer() and SIGALRM.  */
 > +      pause ();
 > +      break;
 > +

Thanks for the review. You're right, the pause mustn't happen if
itc_itimer_fired == 1.  Let me ponder this for a while...

/Mikael
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