Re: [Xen-devel] [PATCH 4/4] drop __get_cpu_var() and __get_cpu_ptr()

[Julien Grall <julien.grall@xxxxxxx>]

Hi Jan,

On 14/06/2019 16:38, Jan Beulich wrote:
> this_cpu{,_ptr}() are shorter, and have previously been marked as
> preferred in Xen anyway.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Julien Grall <julien.grall@xxxxxxx>

> --- a/xen/common/rcupdate.c
> +++ b/xen/common/rcupdate.c
> @@ -225,7 +225,7 @@ void call_rcu(struct rcu_head *head,
>       head->func = func;
>       head->next = NULL;
>       local_irq_save(flags);
> -    rdp = &__get_cpu_var(rcu_data);
> +    rdp = &this_cpu(rcu_data);
>       *rdp->nxttail = head;
>       rdp->nxttail = &head->next;
>       if (unlikely(++rdp->qlen > qhimark)) {
> @@ -409,7 +409,7 @@ static void __rcu_process_callbacks(stru
>   
>   static void rcu_process_callbacks(void)
>   {
> -    __rcu_process_callbacks(&rcu_ctrlblk, &__get_cpu_var(rcu_data));
> +    __rcu_process_callbacks(&rcu_ctrlblk, &this_cpu(rcu_data));
>   }
>   
>   static int __rcu_pending(struct rcu_ctrlblk *rcp, struct rcu_data *rdp)
> --- a/xen/include/asm-arm/percpu.h
> +++ b/xen/include/asm-arm/percpu.h
> @@ -17,12 +17,12 @@ void percpu_init_areas(void);
>   
>   #define per_cpu(var, cpu)  \
>       (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]))
> -#define __get_cpu_var(var) \
> +#define this_cpu(var) \
>       (*RELOC_HIDE(&per_cpu__##var, READ_SYSREG(TPIDR_EL2)))
>   
>   #define per_cpu_ptr(var, cpu)  \
>       (*RELOC_HIDE(var, __per_cpu_offset[cpu]))
> -#define __get_cpu_ptr(var) \
> +#define this_cpu_ptr(var) \
>       (*RELOC_HIDE(var, READ_SYSREG(TPIDR_EL2)))
>   
>   #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
> --- a/xen/include/asm-x86/percpu.h
> +++ b/xen/include/asm-x86/percpu.h
> @@ -15,12 +15,12 @@ void percpu_init_areas(void);
>   /* var is in discarded region: offset to particular copy we want */
>   #define per_cpu(var, cpu)  \
>       (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset[cpu]))
> -#define __get_cpu_var(var) \
> +#define this_cpu(var) \
>       (*RELOC_HIDE(&per_cpu__##var, get_cpu_info()->per_cpu_offset))
>   
>   #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
>   
> -#define __get_cpu_ptr(var) \
> +#define this_cpu_ptr(var) \
>       (*RELOC_HIDE(var, get_cpu_info()->per_cpu_offset))
>   
>   #define per_cpu_ptr(var, cpu)  \
> --- a/xen/include/xen/percpu.h
> +++ b/xen/include/xen/percpu.h
> @@ -13,11 +13,6 @@
>   #define DEFINE_PER_CPU_READ_MOSTLY(type, name) \
>         __DEFINE_PER_CPU(type, _##name, .read_mostly)
>   
> -/* Preferred on Xen. Also see arch-defined per_cpu(). */
> -#define this_cpu(var)    __get_cpu_var(var)
> -
> -#define this_cpu_ptr(ptr)    __get_cpu_ptr(ptr)
> -
>   #define get_per_cpu_var(var)  (per_cpu__##var)
>   
>   /* Linux compatibility. */
> --- a/xen/xsm/flask/avc.c
> +++ b/xen/xsm/flask/avc.c
> @@ -57,9 +57,9 @@ const struct selinux_class_perm selinux_
>   #define AVC_CACHE_RECLAIM        16
>   
>   #ifdef CONFIG_XSM_FLASK_AVC_STATS
> -#define avc_cache_stats_incr(field)                 \
> -do {                                \
> -    __get_cpu_var(avc_cache_stats).field++;        \
> +#define avc_cache_stats_incr(field)    \
> +do {                                   \
> +    this_cpu(avc_cache_stats).field++; \
>   } while (0)
>   #else
>   #define avc_cache_stats_incr(field)    do {} while (0)
--
Julien Grall

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