commit 129182e5626972ac0df85d43a36dd46ad61c64e1
author Andrew Morton <akpm@linux-foundation.org> Fri Jan 08 14:42:39 2010 -0800
committer Linus Torvalds <torvalds@linux-foundation.org> Mon Jan 11 09:34:04 2010 -0800
tree c91d17c697aa29d284dbe065423e01ca7020db73
parent 8767ba2796a1c894e6d9524584a26a8224f0543d

percpu: avoid calling __pcpu_ptr_to_addr(NULL)

__pcpu_ptr_to_addr() can be overridden by the architecture and might not
behave well if passed a NULL pointer.  So avoid calling it until we have
verified that its arg is not NULL.

Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>