percpu: fix too low alignment restriction on UP
UP __alloc_percpu() triggered WARN_ON_ONCE() if the requested
alignment is larger than that of unsigned long long, which is too
small for all the cacheline aligned allocations. Bump it up to
SMP_CACHE_BYTES which kmalloc allocations generally guarantee.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index d8e5a9a..545b068 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -156,7 +156,7 @@
* on it. Larger alignment should only be used for module
* percpu sections on SMP for which this path isn't used.
*/
- WARN_ON_ONCE(align > __alignof__(unsigned long long));
+ WARN_ON_ONCE(align > SMP_CACHE_BYTES);
return kzalloc(size, GFP_KERNEL);
}