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| author | John Ogness <john.ogness@linutronix.de> | 2022-04-21 23:22:36 +0200 |
|---|---|---|
| committer | Petr Mladek <pmladek@suse.com> | 2022-04-22 21:30:57 +0200 |
| commit | faebd693c59387b7b765fab64b543855e15a91b4 (patch) | |
| tree | dc9488b74668e7602f114e5ccf759d6d924e1d3f /lib/nmi_backtrace.c | |
| parent | Merge tag 'printk-for-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/... (diff) | |
| download | linux-faebd693c59387b7b765fab64b543855e15a91b4.tar.xz linux-faebd693c59387b7b765fab64b543855e15a91b4.zip | |
printk: rename cpulock functions
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
Diffstat (limited to 'lib/nmi_backtrace.c')
| -rw-r--r-- | lib/nmi_backtrace.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/nmi_backtrace.c b/lib/nmi_backtrace.c index 199ab201d501..d01aec6ae15c 100644 --- a/lib/nmi_backtrace.c +++ b/lib/nmi_backtrace.c @@ -99,7 +99,7 @@ bool nmi_cpu_backtrace(struct pt_regs *regs) * Allow nested NMI backtraces while serializing * against other CPUs. */ - printk_cpu_lock_irqsave(flags); + printk_cpu_sync_get_irqsave(flags); if (!READ_ONCE(backtrace_idle) && regs && cpu_in_idle(instruction_pointer(regs))) { pr_warn("NMI backtrace for cpu %d skipped: idling at %pS\n", cpu, (void *)instruction_pointer(regs)); @@ -110,7 +110,7 @@ bool nmi_cpu_backtrace(struct pt_regs *regs) else dump_stack(); } - printk_cpu_unlock_irqrestore(flags); + printk_cpu_sync_put_irqrestore(flags); cpumask_clear_cpu(cpu, to_cpumask(backtrace_mask)); return true; } |