kexec: Add kexec reboot string

The purpose is to notify the kernel module for fast reboot.

Upstream a patch from the SONiC network operating system [1].

[1]: https://github.com/Azure/sonic-linux-kernel/pull/46

Link: https://lkml.kernel.org/r/20210304124626.13927-1-pmenzel@molgen.mpg.de
Signed-off-by: Joe LeVeque <jolevequ@microsoft.com>
Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de>
Acked-by: Baoquan He <bhe@redhat.com>
Cc: Guohan Lu <lguohan@gmail.com>
Cc: Joe LeVeque <jolevequ@microsoft.com>
Cc: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index a0b6780740c8a24650b3d12c6abe79e70c2e0f95..f04d04d1b855db8221ba8423497f35c6d7c2fc3b 100644 (file)
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c
@@ -1165,7 +1165,7 @@ int kernel_kexec(void)
 #endif
        {
                kexec_in_progress = true;
-               kernel_restart_prepare(NULL);
+               kernel_restart_prepare("kexec reboot");
                migrate_to_reboot_cpu();
 
                /*