printk: Drop console_sem during panic

mainline inclusion
from mainline-v5.18-rc1
commit 8ebc476f
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I89RYC
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8ebc476fd51e6c0fd3174ec1959a20ba99d4c5e5



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If another CPU is in panic, we are about to be halted. Try to gracefully
abandon the console_sem, leaving it free for the panic CPU to grab.

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/20220202171821.179394-5-stephen.s.brennan@oracle.com



Conflict:
	kernel/printk/printk.c

Signed-off-by: Ye Weihua <yeweihua4@huawei.com>