Commit 9394c1c6 authored Mar 11, 2013 by Ming Lei Committed by Russell King May 15, 2013

ARM: 7669/1: keep __my_cpu_offset consistent with generic one



Commit 14318efb(ARM: 7587/1: implement optimized percpu variable access)
introduces arm's __my_cpu_offset to optimize percpu vaiable access,
which really works well on hackbench, but will cause __my_cpu_offset
to return garbage value before it is initialized in cpu_init() called
by setup_arch, so accessing percpu variable before setup_arch may cause
kernel hang. But generic __my_cpu_offset always returns zero before
percpu area is brought up, and won't hang kernel.

So the patch tries to clear __my_cpu_offset on boot CPU early
to avoid boot hang.

At least now percpu variable is accessed by lockdep before
setup_arch(), and enabling CONFIG_LOCK_STAT or CONFIG_DEBUG_LOCKDEP
can trigger kernel hang.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

parent f722406f

arch/arm/kernel/setup.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -456,6 +456,13 @@ void __init smp_setup_processor_id(void)
		for (i = 1; i < nr_cpu_ids; ++i)
		cpu_logical_map(i) = i == cpu ? 0 : i;

		/*
		* clear __my_cpu_offset on boot CPU to avoid hang caused by
		* using percpu variable early, for example, lockdep will
		* access percpu variable inside lock_release
		*/
		set_my_cpu_offset(0);

		printk(KERN_INFO "Booting Linux on physical CPU 0x%x\n", mpidr);
		}