printk: Mark __printk percpu data ready __ro_after_init

KAGA-KOKO · pmladek · commit 78ba392c84c7 · 2022-09-29T15:20:52.000+02:00
This variable cannot change post boot. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Ogness <john.ogness@linutronix.de> Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org> Reviewed-by: Petr Mladek <pmladek@suse.com> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/20220924000454.3319186-6-john.ogness@linutronix.de
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
@@ -430,7 +430,7 @@ static struct printk_ringbuffer *prb = &printk_rb_static;
  * per_cpu_areas are initialised. This variable is set to true when
  * it's safe to access per-CPU data.
  */
-static bool __printk_percpu_data_ready __read_mostly;
+static bool __printk_percpu_data_ready __ro_after_init;
 
 bool printk_percpu_data_ready(void)
 {

Original file line number	Diff line number	Diff line change
`@@ -430,7 +430,7 @@ static struct printk_ringbuffer *prb = &printk_rb_static;`
`430`	`430`	`* per_cpu_areas are initialised. This variable is set to true when`
`431`	`431`	`* it's safe to access per-CPU data.`
`432`	`432`	`*/`
`433`		`-static bool __printk_percpu_data_ready __read_mostly;`
	`433`	`+static bool __printk_percpu_data_ready __ro_after_init;`
`434`	`434`
`435`	`435`	`bool printk_percpu_data_ready(void)`
`436`	`436`	`{`