linux-kernel - Re: Linux 3.4-rc7

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Date:	Mon, 14 May 2012 01:58:47 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	John David Anglin <dave.anglin@...l.net>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"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>
Subject: Re: Linux 3.4-rc7

On 05/14/2012 01:38 AM, John David Anglin wrote:

> On 13-May-12, at 3:56 PM, Srivatsa S. Bhat wrote:
> 
>> The regression was introduced in the 3.4 merge window itself (by commit
>> 5fbd036b55 "sched: Cleanup cpu_active madness").
>>
>> Links to the original posting:
>> PA_RISC: http://marc.info/?l=linux-parisc&m=133241790810604&w=2
> 
> 
> If I had the above change, I get
> 
>   CHK     include/generated/compile.h
>   CC      arch/parisc/kernel/smp.o
> arch/parisc/kernel/smp.c: In function 'smp_cpu_init':
> arch/parisc/kernel/smp.c:300:2: error: implicit declaration of function
> 'notify_cpu_starting' [-Werror=implicit-function-declaration]
> cc1: some warnings being treated as errors
> make[1]: *** [arch/parisc/kernel/smp.o] Error 1
> 


Sorry about that. I neither have the hardware nor the toolchain
to test it. I guess this problem doesn't exist for mn10300 since it
already includes linux/cpu.h when CONFIG_HOTPLUG_CPU=y

Does the below updated patch help for PA-RISC?

----
From: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>

parisc/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/parisc/kernel/smp.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)


diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
index 0bb1d63..4dc7b79 100644
--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -31,6 +31,7 @@
 #include <linux/delay.h>
 #include <linux/bitops.h>
 #include <linux/ftrace.h>
+#include <linux/cpu.h>
 
 #include <linux/atomic.h>
 #include <asm/current.h>
@@ -295,8 +296,13 @@ smp_cpu_init(int cpunum)
 
 		printk(KERN_CRIT "CPU#%d already initialized!\n", cpunum);
 		machine_halt();
-	}  
+	}
+
+	notify_cpu_starting(cpunum);
+
+	ipi_call_lock();
 	set_cpu_online(cpunum, true);
+	ipi_call_unlock();
 
 	/* Initialise the idle task for this CPU */
 	atomic_inc(&init_mm.mm_count);

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