From: Stephen Brennan <stephen.s.brennan@oracle.com> mainline inclusion from mainline-v5.18-rc1 commit 77498617857f68496b360081dde1a492d40c28b2 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I89RYC CVE: NA ------------------------------------------------- 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.c... Signed-off-by: Ye Weihua <yeweihua4@huawei.com> --- kernel/printk/printk.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index d0fbbc23ad6b..f86160077222 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -248,6 +248,11 @@ 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 -- 2.34.1