linux-kernel - Re: Linux 3.4-rc7

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Date:	Sun, 13 May 2012 16:40:07 -0400
From:	John David Anglin <dave.anglin@...l.net>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
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

Yes, the revised change fixes the compilation error.  I'll know in a  
while if
my config boots.

Thanks,
Dave

On 13-May-12, at 4:28 PM, Srivatsa S. Bhat wrote:

> 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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>

--
John David Anglin	dave.anglin@...l.net



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