On Tue, 2014-07-01 at 10:52 +1000, Michael Ellerman wrote:

On Mon, 2014-06-30 at 11:54 +0530, Preeti U Murthy wrote:

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Commit 8d6f7c5a: "powerpc/powernv: Make it possible to skip the IRQHAPP=

ENED

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check in power7_nap()" added code that prevents even cores which enter =

sleep

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on idle, from checking for pending interrupts. Fix this.

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To be clear, it is a bug in the original commit. Mikey and I pair program=

med

that code, and he was *definitely* typing at that point ;)

It's always nice to know that in battle a comrade will throw himself on
a grenade to save you. :-P

Actually, I'm pretty sure this happened when you were away (probably on
a beach somewhere), I was forward porting the patch set, hit a conflict
and fucked it up. =20

Mikey

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Can you please include in the changelog what the symptom of the bug is, a=

nd

have you seen it in practice?
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The bad commit went into 3.16-rc1, so we don't need to backport this to a=

ny

stable release.
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cheers
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diff --git a/arch/powerpc/kernel/idle_power7.S b/arch/powerpc/kernel/id=

le_power7.S

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index 2480256..5cf3d36 100644

--- a/arch/powerpc/kernel/idle_power7.S
+++ b/arch/powerpc/kernel/idle_power7.S

@@ -131,7 +131,7 @@ _GLOBAL(power7_nap)

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 _GLOBAL(power7_sleep)
 	li	r3,1
-	li	r4,0
+	li	r4,1
 	b	power7_powersave_common
 	/* No return */
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