From: Huang Ying <ying.hu...@intel.com>
To allocate percpu memory that is aligned with cache line size
dynamically. We can statically allocate percpu memory that is aligned
with cache line size with DEFINE_PER_CPU_ALIGNED(), but we have no
correspondent API for dynamic allocation.
Signed-off-by: "Huang, Ying" <ying.hu...@intel.com>
Cc: Tejun Heo <t...@kernel.org>
Cc: Christoph Lameter <c...@linux.com>
---
include/linux/percpu.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index 491b3f5a5f8a..8b80a965d64a 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -129,5 +129,8 @@ extern phys_addr_t per_cpu_ptr_to_phys(void *addr);
#define alloc_percpu(type) \
(typeof(type) __percpu *)__alloc_percpu(sizeof(type), \
__alignof__(type))
+#define alloc_percpu_aligned(type) \
+ ((typeof(type) __percpu *)__alloc_percpu(sizeof(type), \
+ max_t(unsigned int, cache_line_size(), __alignof__(type))))
#endif /* __LINUX_PERCPU_H */
--
2.13.2
