diff mbox series

[v3,05/14] perf/hw_breakpoint: Mark data __ro_after_init

Message ID 20220704150514.48816-6-elver@google.com (mailing list archive)
State New, archived
Headers show
Series perf/hw_breakpoint: Optimize for thousands of tasks | expand

Commit Message

Marco Elver July 4, 2022, 3:05 p.m. UTC 
Mark read-only data after initialization as __ro_after_init.

While we are here, turn 'constraints_initialized' into a bool.

Signed-off-by: Marco Elver <elver@google.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
---
 kernel/events/hw_breakpoint.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

Comments

Ian Rogers July 20, 2022, 3:30 p.m. UTC | #1 
On Mon, Jul 4, 2022 at 8:06 AM Marco Elver <elver@google.com> wrote:
>
> Mark read-only data after initialization as __ro_after_init.
>
> While we are here, turn 'constraints_initialized' into a bool.
>
> Signed-off-by: Marco Elver <elver@google.com>
> Reviewed-by: Dmitry Vyukov <dvyukov@google.com>

Acked-by: Ian Rogers <irogers@google.com>

Thanks,
Ian

> ---
>  kernel/events/hw_breakpoint.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/kernel/events/hw_breakpoint.c b/kernel/events/hw_breakpoint.c
> index 6d09edc80d19..7df46b276452 100644
> --- a/kernel/events/hw_breakpoint.c
> +++ b/kernel/events/hw_breakpoint.c
> @@ -46,7 +46,7 @@ struct bp_cpuinfo {
>  };
>
>  static DEFINE_PER_CPU(struct bp_cpuinfo, bp_cpuinfo[TYPE_MAX]);
> -static int nr_slots[TYPE_MAX];
> +static int nr_slots[TYPE_MAX] __ro_after_init;
>
>  static struct bp_cpuinfo *get_bp_info(int cpu, enum bp_type_idx type)
>  {
> @@ -62,7 +62,7 @@ static const struct rhashtable_params task_bps_ht_params = {
>         .automatic_shrinking = true,
>  };
>
> -static int constraints_initialized;
> +static bool constraints_initialized __ro_after_init;
>
>  /* Gather the number of total pinned and un-pinned bp in a cpuset */
>  struct bp_busy_slots {
> @@ -739,7 +739,7 @@ int __init init_hw_breakpoint(void)
>         if (ret)
>                 goto err;
>
> -       constraints_initialized = 1;
> +       constraints_initialized = true;
>
>         perf_pmu_register(&perf_breakpoint, "breakpoint", PERF_TYPE_BREAKPOINT);
>
> --
> 2.37.0.rc0.161.g10f37bed90-goog
>
diff mbox series

Patch

diff --git a/kernel/events/hw_breakpoint.c b/kernel/events/hw_breakpoint.c
index 6d09edc80d19..7df46b276452 100644
--- a/kernel/events/hw_breakpoint.c
+++ b/kernel/events/hw_breakpoint.c
@@ -46,7 +46,7 @@  struct bp_cpuinfo {
 };
 
 static DEFINE_PER_CPU(struct bp_cpuinfo, bp_cpuinfo[TYPE_MAX]);
-static int nr_slots[TYPE_MAX];
+static int nr_slots[TYPE_MAX] __ro_after_init;
 
 static struct bp_cpuinfo *get_bp_info(int cpu, enum bp_type_idx type)
 {
@@ -62,7 +62,7 @@  static const struct rhashtable_params task_bps_ht_params = {
 	.automatic_shrinking = true,
 };
 
-static int constraints_initialized;
+static bool constraints_initialized __ro_after_init;
 
 /* Gather the number of total pinned and un-pinned bp in a cpuset */
 struct bp_busy_slots {
@@ -739,7 +739,7 @@  int __init init_hw_breakpoint(void)
 	if (ret)
 		goto err;
 
-	constraints_initialized = 1;
+	constraints_initialized = true;
 
 	perf_pmu_register(&perf_breakpoint, "breakpoint", PERF_TYPE_BREAKPOINT);