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Message-ID: <alpine.DEB.2.10.1401201915250.2663@minerva.lan> Date: Mon, 20 Jan 2014 19:22:51 -0700 (MST) From: Nate Eldredge <nate@...tsmathematics.com> To: George Spelvin <linux@...izon.com> cc: adilger@...ger.ca, arjan@...ux.intel.com, jack@...e.cz, linux-kernel@...r.kernel.org, maarten-baert@...mail.com, mingo@...e.hu, suresh.b.siddha@...el.com, tglx@...utronix.de, viro@...iv.linux.org.uk Subject: Re: math_state_restore and kernel_fpu_end disable interrupts? On Sun, 19 Jan 2014, George Spelvin wrote: >> It's credited to Suresh Siddha, whom I've cc'ed (along with others who >> signed off). Suresh, if you're still around, could you comment on why >> math_state_restore always leaves interrupts disabled, regardless of their >> state on entry? Is there a deep reason or is it a bug? > > What the comments seemed to be implying was that it was a bug to enter > this code with interrupts enabled. So the problem may be a little bit > more systemic; expert counsel is required. It would be kind of weird for code that requires disabled interrupts on entry to turn around and enable interrupts itself. I agree that it would really help for a guru to take a look... On which note, Suresh's email bounced :-( -- Nate Eldredge nate@...tsmathematics.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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