Messages in this thread Patch in this message | | | From | Sergey Senozhatsky <> | Subject | [RFC][PATCHv2 6/8] kexec: switch to printk.emergency mode in unsafe places | Date | Wed, 29 Mar 2017 18:25:09 +0900 |
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Switch to printk emergency mode in kernel_kexec(), this lets us to immediately flush pending kernel message to the console and to avoid potentially unsafe calls into the scheduler.
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> --- kernel/kexec_core.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c index bfe62d5b3872..5684ba36ec15 100644 --- a/kernel/kexec_core.c +++ b/kernel/kexec_core.c @@ -1496,6 +1496,8 @@ int kernel_kexec(void) goto Unlock; } + printk_emergency_begin(); + #ifdef CONFIG_KEXEC_JUMP if (kexec_image->preserve_context) { lock_system_sleep(); @@ -1565,6 +1567,8 @@ int kernel_kexec(void) } #endif + printk_emergency_end(); + Unlock: mutex_unlock(&kexec_mutex); return error; -- 2.12.2
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