On Wed, 2 Aug 2017, Huang, Ying wrote: > --- 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 */
This is not needeed since alloc_percpu() already uses __alignof__(type). If you add an attribute to the definition of "type" that requires cacheline alignmet (f.e. __cacheline_aligned) then alloc_percpu() will align the allocation as you desire.