linux-kernel - [PATCH v4 05/14] perf/hw_breakpoint: Mark data __ro_after

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Date:   Mon, 29 Aug 2022 14:47:10 +0200
From:   Marco Elver <elver@...gle.com>
To:     elver@...gle.com, Peter Zijlstra <peterz@...radead.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Ingo Molnar <mingo@...nel.org>
Cc:     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>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org, linux-perf-users@...r.kernel.org,
        x86@...nel.org, linux-sh@...r.kernel.org,
        kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH v4 05/14] perf/hw_breakpoint: Mark data __ro_after_init

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>
Acked-by: Ian Rogers <irogers@...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 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);
 
-- 
2.37.2.672.g94769d06f0-goog