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authorBoris Ostrovsky <boris.ostrovsky@oracle.com>2016-08-03 20:22:28 +0300
committerIngo Molnar <mingo@kernel.org>2016-08-10 16:42:57 +0300
commitaa877175e7a9982233ed8f10cb4bfddd78d82741 (patch)
treea97d5017cec83ee19a42c59b7c99f26a70cd044a /kernel/cpu.c
parenta0cba2179ea4c1820fce2ee046b6ed90ecc56196 (diff)
downloadlinux-aa877175e7a9982233ed8f10cb4bfddd78d82741.tar.xz
cpu/hotplug: Prevent alloc/free of irq descriptors during CPU up/down (again)
Now that Xen no longer allocates irqs in _cpu_up() we can restore commit: a89941816726 ("hotplug: Prevent alloc/free of irq descriptors during cpu up/down") Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Reviewed-by: Juergen Gross <jgross@suse.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Anna-Maria Gleixner <anna-maria@linutronix.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: david.vrabel@citrix.com Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/1470244948-17674-3-git-send-email-boris.ostrovsky@oracle.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/cpu.c')
-rw-r--r--kernel/cpu.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 341bf80f80bd..ec12b726fa6f 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -349,8 +349,16 @@ static int bringup_cpu(unsigned int cpu)
struct task_struct *idle = idle_thread_get(cpu);
int ret;
+ /*
+ * Some architectures have to walk the irq descriptors to
+ * setup the vector space for the cpu which comes online.
+ * Prevent irq alloc/free across the bringup.
+ */
+ irq_lock_sparse();
+
/* Arch-specific enabling code. */
ret = __cpu_up(cpu, idle);
+ irq_unlock_sparse();
if (ret) {
cpu_notify(CPU_UP_CANCELED, cpu);
return ret;