printk/panic: prevent spin waiting in printk()

hulk inclusion
category: bugfix
bugzilla: 41832, https://gitee.com/openeuler/kernel/issues/I4JKT1


CVE: NA

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When one cpu panic, the panic cpu send NMI to other cpus, if one of
the non-panic cpus is in printk() and get stopped before release
console_waiter, the panic cpu may spin waiting.

Here just release console_waiter directly after all non-panic cpus
get stopped.

Signed-off-by: Chen Zhou <chenzhou10@huawei.com>
Reviewed-by: Jian Cheng <cj.chengjian@huawei.com>
Reviewed-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Chen Zhou <chenzhou10@huawei.com>
Signed-off-by: Cheng Jian <cj.chengjian@huawei.com>
Reviewed-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>