linux-kernel - Re: Linux 3.4-rc7

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Message-ID: <4FB2A2F3.40101@linux.vnet.ibm.com>
Date:	Wed, 16 May 2012 00:09:47 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	John David Anglin <dave.anglin@...l.net>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mikulas Patocka <mpatocka@...hat.com>, stepanm@...eaurora.org,
	Thomas Gleixner <tglx@...utronix.de>,
	James.Bottomley@...senpartnership.com, deller@....de,
	dhowells@...hat.com, yasutake.koichi@...panasonic.com,
	eike-kernel@...tec.de, linux-parisc@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	tobiasu@...x.org
Subject: Re: Linux 3.4-rc7

On 05/15/2012 11:59 PM, Srivatsa S. Bhat wrote:

> On 05/15/2012 10:54 PM, Linus Torvalds wrote:
> 
>> On Sun, May 13, 2012 at 5:42 PM, John David Anglin <dave.anglin@...l.net> wrote:
>>>
>>> I successfully booted 3.4-rc7 with this change on rp3440 (4 cpu smp).  My
>>> build also
>>> included cache and other fixes that are being discussed on the parisc list.
>>
>> Can somebody send the final patches with proper subject lines etc,
>> instead of hiding them in unrelated threads? I hate picking up patches
>> that I don't personally know from the middle of some random thread.
>>
> 
> 
> Okay, here they are:
> 


This one is for mn10300:

---
From: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
Subject: [PATCH] mn10300/CPU hotplug: Add missing call to notify_cpu_starting()

The scheduler depends on receiving the CPU_STARTING notification, without
which we end up into a lot of trouble. So add the missing call to
notify_cpu_starting() in the bringup code.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---

 arch/mn10300/kernel/smp.c |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/mn10300/kernel/smp.c b/arch/mn10300/kernel/smp.c
index 910dddf..9cd69ad 100644
--- a/arch/mn10300/kernel/smp.c
+++ b/arch/mn10300/kernel/smp.c
@@ -24,6 +24,7 @@
 #include <linux/sched.h>
 #include <linux/profile.h>
 #include <linux/smp.h>
+#include <linux/cpu.h>
 #include <asm/tlbflush.h>
 #include <asm/bitops.h>
 #include <asm/processor.h>
@@ -38,7 +39,6 @@
 #include "internal.h"
 
 #ifdef CONFIG_HOTPLUG_CPU
-#include <linux/cpu.h>
 #include <asm/cacheflush.h>
 
 static unsigned long sleep_mode[NR_CPUS];
@@ -874,10 +874,13 @@ static void __init smp_online(void)
 
 	cpu = smp_processor_id();
 
-	local_irq_enable();
+	notify_cpu_starting(cpu);
 
+	ipi_call_lock();
 	set_cpu_online(cpu, true);
-	smp_wmb();
+	ipi_call_unlock();
+
+	local_irq_enable();
 }
 
 /**


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