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x86_64: initialize this_cpu_off to __per_cpu_load

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On x86_64, if get_per_cpu_var() is used before per cpu area is setup
(if lockdep is turned on, it happens), it needs this_cpu_off to point
to __per_cpu_load.  Initialize accordingly.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo
2009-01-16 12:11:43 +09:00
committed by Ingo Molnar
parent a338af2c64
commit cd3adf5230
1 changed files with 5 additions and 0 deletions
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arch/x86/kernel/smpcommon.c
+5
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@@ -3,8 +3,13 @@
*/
#include <linux/module.h>
#include <asm/smp.h>
#include <asm/sections.h>
#ifdef CONFIG_X86_64
DEFINE_PER_CPU(unsigned long, this_cpu_off) = (unsigned long)__per_cpu_load;
#else
DEFINE_PER_CPU(unsigned long, this_cpu_off);
#endif
EXPORT_PER_CPU_SYMBOL(this_cpu_off);
#ifdef CONFIG_X86_32