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printk: rename cpulock functions

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Since the printk cpulock is CPU-reentrant and since it is used
in all contexts, its usage must be carefully considered and
most likely will require programming locklessly. To avoid
mistaking the printk cpulock as a typical lock, rename it to
cpu_sync. The main functions then become:

    printk_cpu_sync_get_irqsave(flags);
    printk_cpu_sync_put_irqrestore(flags);

Add extra notes of caution in the function description to help
developers understand the requirements for correct usage.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20220421212250.565456-2-john.ogness@linutronix.de
This commit is contained in:
John Ogness
2022-04-21 23:28:36 +02:06
committed by Petr Mladek
parent 3ef4ea3d84
commit faebd693c5
4 changed files with 73 additions and 60 deletions
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4
lib/dump_stack.c
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@@ -102,9 +102,9 @@ asmlinkage __visible void dump_stack_lvl(const char *log_lvl)
* Permit this cpu to perform nested stack dumps while serialising
* against other CPUs
*/
printk_cpu_lock_irqsave(flags);
printk_cpu_sync_get_irqsave(flags);
__dump_stack(log_lvl);
printk_cpu_unlock_irqrestore(flags);
printk_cpu_sync_put_irqrestore(flags);
}
EXPORT_SYMBOL(dump_stack_lvl);