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| author |   Stephen Brennan <stephen.s.brennan@oracle.com> | 2022-02-02 09:18:18 -0800 |
|---|---|---|
| committer |   Petr Mladek <pmladek@suse.com> | 2022-02-14 13:39:20 +0100 |
| commit | 77498617857f68496b360081dde1a492d40c28b2 (patch) | |
| tree | 292499391fc52f5875c2a62d2a8f170cc1e1a2b9 /kernel/printk/printk.c | |
| parent | Merge tag 'printk-for-5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux (diff) | |
| download | linux-dev-77498617857f68496b360081dde1a492d40c28b2.tar.xz linux-dev-77498617857f68496b360081dde1a492d40c28b2.zip | |
printk: Add panic_in_progress helper
This will be used help avoid deadlocks during panics. Although it would
be better to include this in linux/panic.h, it would require that header
to include linux/atomic.h as well. On some architectures, this results
in a circular dependency as well. So instead add the helper directly to
printk.c.
Suggested-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Stephen Brennan <stephen.s.brennan@oracle.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20220202171821.179394-2-stephen.s.brennan@oracle.com
Diffstat (limited to 'kernel/printk/printk.c')
| -rw-r--r-- | kernel/printk/printk.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 155229f0cf0f..f04bbed0aa79 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -256,6 +256,11 @@ static void __up_console_sem(unsigned long ip) } #define up_console_sem() __up_console_sem(_RET_IP_) +static bool panic_in_progress(void) +{ + return unlikely(atomic_read(&panic_cpu) != PANIC_CPU_INVALID); +} + /* * This is used for debugging the mess that is the VT code by * keeping track if we have the console semaphore held. It's |