linux-kernel - Re: Linux 3.4-rc7

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Date:	Tue, 15 May 2012 23:59:36 +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>
Subject: Re: Linux 3.4-rc7

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 is for PA-RISC:

---
From: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
Subject: [PATCH] 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>
Acked-and-Tested-by: Mikulas Patocka <mpatocka@...hat.com>
Acked-and-Tested-by: Tobias Ulmer <tobiasu@...x.org>
Tested-by: John David Anglin <dave.anglin@...l.net>
---

 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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