diff options
| author | Boris Ostrovsky | 2016-08-03 13:22:28 -0400 |
|---|---|---|
| committer | Ingo Molnar | 2016-08-10 15:42:57 +0200 |
| commit | aa877175e7a9982233ed8f10cb4bfddd78d82741 (patch) | |
| tree | a97d5017cec83ee19a42c59b7c99f26a70cd044a /kernel/cpu.c | |
| parent | a0cba2179ea4c1820fce2ee046b6ed90ecc56196 (diff) | |
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.c | 8 |
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; |