slub: always align cpu_slab to honor cmpxchg_double requirement

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On an architecture without CMPXCHG_LOCAL but with DEBUG_VM enabled,
the VM_BUG_ON() in __pcpu_double_call_return_bool() will cause an early
panic during boot unless we always align cpu_slab properly.

In principle we could remove the alignment-testing VM_BUG_ON() for
architectures that don't have CMPXCHG_LOCAL, but leaving it in means
that new code will tend not to break x86 even if it is introduced
on another platform, and it's low cost to require alignment.

Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

...

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Chris Metcalf 2011-06-02 10:19:41 -04:00 • committed by Pekka Enberg

parent 55922c9d1b

commit d4d84fef6d

2 changed files with 7 additions and 8 deletions

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include/linux/percpu.h

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