linux-kernel - Re: [PATCH 2/8] perf/hw_breakpoint: Mark data __ro_after

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Message-ID: <CACT4Y+ZM3yYYeOGBNEA8+FzjjfMcR-TiENjmCB8Dq-KSPvOWyg@mail.gmail.com>
Date:   Thu, 9 Jun 2022 13:45:25 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Marco Elver <elver@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users@...r.kernel.org, x86@...nel.org,
        linux-sh@...r.kernel.org, kasan-dev@...glegroups.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/8] perf/hw_breakpoint: Mark data __ro_after_init

On Thu, 9 Jun 2022 at 13:31, Marco Elver <elver@...gle.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@...gle.com>

Reviewed-by: Dmitry Vyukov <dvyukov@...gle.com>

> ---
>  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 25c94c6e918d..1f718745d569 100644
> --- a/kernel/events/hw_breakpoint.c
> +++ b/kernel/events/hw_breakpoint.c
> @@ -47,7 +47,7 @@ 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)
>  {
> @@ -63,7 +63,7 @@ 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 {
> @@ -711,7 +711,7 @@ 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);
>
> --
> 2.36.1.255.ge46751e96f-goog
>