Messages in this thread Patch in this message | | | From | Stephen Brennan <> | Subject | [PATCH v4 1/4] printk: Add panic_in_progress helper | Date | Wed, 2 Feb 2022 09:18:18 -0800 |
| |
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> ---
Notes: v4: Move helper outside CONFIG_PRINTK section v3: Move the helper into printk.c due to circular include v2: Switch from macro to static inline function
kernel/printk/printk.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 57b132b658e1..e3d986dd49a1 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 -- 2.30.2
| |