On Mon, Oct 15, 2012 at 05:31:28PM -0700, Paul E. McKenney wrote: > The console_cpu_notify( function runs with interrupts disabled in > the CPU_DEAD case. It therefore cannot block, for example, as will > happen when it calls console_lock(). Therefore, remove the CPU_DEAD > leg of the switch statement to avoid this problem. > > Signed-off-by: Paul E. McKenney <paul.mcken...@linaro.org>
s/CPU_DEAD/CPU_DYING/ Apparently it is a bad idea to compose and send a patch while in a C++ standards committee meeting where people are arguing about async futures... Fixed patch below. Thanx, Paul ------------------------------------------------------------------------ printk: Fix scheduling-while-atomic problem in console_cpu_notify() The console_cpu_notify( function runs with interrupts disabled in the CPU_DYING case. It therefore cannot block, for example, as will happen when it calls console_lock(). Therefore, remove the CPU_DYING leg of the switch statement to avoid this problem. Signed-off-by: Paul E. McKenney <paul...@linux.vnet.ibm.com> diff --git a/kernel/printk.c b/kernel/printk.c index 66a2ea3..2d607f4 100644 --- a/kernel/printk.c +++ b/kernel/printk.c @@ -1890,7 +1890,6 @@ static int __cpuinit console_cpu_notify(struct notifier_block *self, switch (action) { case CPU_ONLINE: case CPU_DEAD: - case CPU_DYING: case CPU_DOWN_FAILED: case CPU_UP_CANCELED: console_lock(); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/