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From: Jens Rottmann <JRottmann@LiPPERTEmbedded.de>
To: Thomas Gleixner <tglx@linutronix.de>, John Stultz <johnstul@us.ibm.com>
Cc: Andres Salomon <dilinger@queued.net>,
	linux-kernel@vger.kernel.org, linux-geode@lists.infradead.org
Subject: [PATCH] cs5535-clockevt: allow the MFGPT IRQ to be shared
Date: Mon, 30 Jan 2012 14:59:04 +0100	[thread overview]
Message-ID: <4F26A228.4030106@LiPPERTEmbedded.de> (raw)
In-Reply-To: <20111214104724.292b02d4@queued.net>

cs5535-clockevt: allow the MFGPT IRQ to be shared

Shared timer IRQs are not a good solution, however the Geode platform has no
APIC, IRQs are a scarce resource and there is no technical reason to forbid it
rightaway.  Increased latencies and overhead due to sharing are still better
than a driver refusing to load.

Signed-off-by: Jens Rottmann <JRottmann@LiPPERTEmbedded.de>
Acked-by: Andres Salomon <dilinger@queued.net>
---

Hi,

could you please take this, for linux-next?

Thanks,
Jens

--- linux-3.2-rc6/drivers/clocksource/cs5535-clockevt.c
+++ allow_shared_mfgpt_irq/drivers/clocksource/cs5535-clockevt.c
@@ -133,7 +133,7 @@ static irqreturn_t mfgpt_tick(int irq, v
 
 static struct irqaction mfgptirq  = {
 	.handler = mfgpt_tick,
-	.flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_TIMER,
+	.flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_TIMER | IRQF_SHARED,
 	.name = DRV_NAME,
 };
 
_



  parent reply	other threads:[~2012-01-30 14:01 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-12-12 15:41 IRQF_TIMER | IRQF_SHARED ? Jens Rottmann
2011-12-12 20:31 ` Andres Salomon
2011-12-12 21:00   ` Martin-Éric Racine
2011-12-12 22:06     ` Andres Salomon
2011-12-12 23:38   ` Thomas Gleixner
2011-12-13 15:49   ` Jens Rottmann
2011-12-14 18:37     ` Jens Rottmann
2011-12-14 18:47       ` Andres Salomon
2011-12-21 15:42         ` [PATCH] cs5535-clockevt: don't ignore MFGPT on SMP-capable kernels Jens Rottmann
2012-01-11 10:10           ` Andres Salomon
2012-01-19 12:57             ` Jens Rottmann
2012-01-23 10:44               ` Andres Salomon
2011-12-21 16:37         ` IRQF_TIMER | IRQF_SHARED ? Jens Rottmann
2011-12-22 16:35         ` [PATCH] cs5535-clockevt: allow the MFGPT IRQ to be shared Jens Rottmann
2012-01-11 10:15           ` Andres Salomon
2012-01-30 13:51         ` [PATCH] cs5535-clockevt: don't ignore MFGPT on SMP-capable kernels Jens Rottmann
2012-01-30 13:59         ` Jens Rottmann [this message]
2012-02-06  8:20         ` [PATCH resend] " Jens Rottmann
2012-02-06  8:23         ` [PATCH resend] cs5535-clockevt: allow the MFGPT IRQ to be shared Jens Rottmann
2011-12-19 14:32       ` "clockevents: Set noop handler in clockevents_exchange_device()" causes hang with cs5535-clockevt Jens Rottmann

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