From: Julien Grall <julien.grall@arm.com>
To: Jan Beulich <JBeulich@suse.com>,
xen-devel <xen-devel@lists.xenproject.org>
Cc: Stefano Stabellini <sstabellini@kernel.org>, Wei Liu <wl@xen.org>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
George Dunlap <George.Dunlap@eu.citrix.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Ian Jackson <Ian.Jackson@eu.citrix.com>, Tim Deegan <tim@xen.org>,
Daniel de Graaf <dgdegra@tycho.nsa.gov>,
Roger Pau Monne <roger.pau@citrix.com>
Subject: Re: [Xen-devel] [PATCH 4/4] drop __get_cpu_var() and __get_cpu_ptr()
Date: Mon, 17 Jun 2019 16:27:02 +0100 [thread overview]
Message-ID: <688a3c9e-6ee2-fb39-c4bf-bc39b41e18f8@arm.com> (raw)
In-Reply-To: <5D03BF8E020000780023861C@prv1-mh.provo.novell.com>
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@suse.com>
Acked-by: Julien Grall <julien.grall@arm.com>
>
> --- 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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next prev parent reply other threads:[~2019-06-17 15:27 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-14 15:33 [Xen-devel] [PATCH 0/4] x86 MCE adjustments for AMD / general per-CPU accessor cleanup Jan Beulich
2019-06-14 15:35 ` [Xen-devel] [PATCH 1/4] x86/mcheck: allow varying bank counts per CPU Jan Beulich
2019-06-21 17:45 ` Andrew Cooper
2019-06-14 15:37 ` [Xen-devel] [PATCH 2/4] x86/mcheck: replace remaining uses of __get_cpu_var() Jan Beulich
2019-06-21 17:46 ` Andrew Cooper
2019-06-14 15:37 ` [Xen-devel] [PATCH 3/4] x86: " Jan Beulich
2019-06-21 17:47 ` Andrew Cooper
2019-06-14 15:38 ` [Xen-devel] [PATCH 4/4] drop __get_cpu_var() and __get_cpu_ptr() Jan Beulich
2019-06-17 15:27 ` Julien Grall [this message]
2019-06-18 18:00 ` Daniel De Graaf
2019-06-21 17:49 ` Andrew Cooper
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