linux-kernel - [tip:smp/hotplug] cris: Use generic idle thread allocation

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Date:	Sat, 28 Apr 2012 02:12:34 -0700
From:	tip-bot for Thomas Gleixner <tglx@...utronix.de>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	jesper.nilsson@...s.com, rusty@...tcorp.com.au,
	peterz@...radead.org, srivatsa.bhat@...ux.vnet.ibm.com,
	paulmck@...ux.vnet.ibm.com, tglx@...utronix.de
Subject: [tip:smp/hotplug] cris: Use generic idle thread allocation

Commit-ID:  a4cfc31da34eacafd9f6b16e149448bf0ef6d0b2
Gitweb:     http://git.kernel.org/tip/a4cfc31da34eacafd9f6b16e149448bf0ef6d0b2
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Fri, 20 Apr 2012 13:05:53 +0000
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Thu, 26 Apr 2012 12:06:11 +0200

cris: Use generic idle thread allocation

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Rusty Russell <rusty@...tcorp.com.au>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
Acked-by: Jesper Nilsson <jesper.nilsson@...s.com>
Link: http://lkml.kernel.org/r/20120420124557.789657793@linutronix.de

---
 arch/cris/Kconfig               |    1 +
 arch/cris/arch-v32/kernel/smp.c |   12 ++----------
 2 files changed, 3 insertions(+), 10 deletions(-)

diff --git a/arch/cris/Kconfig b/arch/cris/Kconfig
index b3abfb0..2995035 100644
--- a/arch/cris/Kconfig
+++ b/arch/cris/Kconfig
@@ -49,6 +49,7 @@ config CRIS
 	select HAVE_GENERIC_HARDIRQS
 	select GENERIC_IRQ_SHOW
 	select GENERIC_IOMAP
+	select GENERIC_SMP_IDLE_THREAD if ETRAX_ARCH_V32
 
 config HZ
 	int
diff --git a/arch/cris/arch-v32/kernel/smp.c b/arch/cris/arch-v32/kernel/smp.c
index 125ee2d..ebe2cb3 100644
--- a/arch/cris/arch-v32/kernel/smp.c
+++ b/arch/cris/arch-v32/kernel/smp.c
@@ -108,17 +108,12 @@ void __init smp_cpus_done(unsigned int max_cpus)
 
 /* Bring one cpu online.*/
 static int __init
-smp_boot_one_cpu(int cpuid)
+smp_boot_one_cpu(int cpuid, struct task_struct idle)
 {
 	unsigned timeout;
-	struct task_struct *idle;
 	cpumask_t cpu_mask;
 
 	cpumask_clear(&cpu_mask);
-	idle = fork_idle(cpuid);
-	if (IS_ERR(idle))
-		panic("SMP: fork failed for CPU:%d", cpuid);
-
 	task_thread_info(idle)->cpu = cpuid;
 
 	/* Information to the CPU that is about to boot */
@@ -142,9 +137,6 @@ smp_boot_one_cpu(int cpuid)
 		barrier();
 	}
 
-	put_task_struct(idle);
-	idle = NULL;
-
 	printk(KERN_CRIT "SMP: CPU:%d is stuck.\n", cpuid);
 	return -1;
 }
@@ -209,7 +201,7 @@ unsigned long cache_decay_ticks = 1;
 
 int __cpuinit __cpu_up(unsigned int cpu, struct task_struct *tidle)
 {
-	smp_boot_one_cpu(cpu);
+	smp_boot_one_cpu(cpu, tidle);
 	return cpu_online(cpu) ? 0 : -ENOSYS;
 }
 
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