The patch titled
Subject: reboot: disable nonboot CPUs
has been added to the -mm tree. Its filename is
reboot-disable-nonboot-cpus.patch
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From: Per Forlin <per.forlin@xxxxxxxxxxxxxx>
Subject: reboot: disable nonboot CPUs
I have run into an issue on an ARM platform that prevents reboot unless
the nonboot CPUs are brought down safetly.
Disable the nonboot CPUs to safely migrate tasks and interrupts to the
boot CPU. This will prevent the nonboot CPUs to interfer or block the
boot CPU from being able to reboot the system successfully.
Is there a reason for disabling nonboot CPUs for power_off but not reboot?
I could make this patch ARM specific but I thought that other ARCHs may
benefit from this patch too.
Signed-off-by: Per Forlin <per.forlin@xxxxxxxxxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Linus Walleij <linus.walleij@xxxxxxxxxx>
Cc: Serge Hallyn <serue@xxxxxxxxxx>
Cc: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/sys.c | 1 +
1 file changed, 1 insertion(+)
diff -puN kernel/sys.c~reboot-disable-nonboot-cpus kernel/sys.c
--- a/kernel/sys.c~reboot-disable-nonboot-cpus
+++ a/kernel/sys.c
@@ -323,6 +323,7 @@ void kernel_restart_prepare(char *cmd)
system_state = SYSTEM_RESTART;
usermodehelper_disable();
device_shutdown();
+ disable_nonboot_cpus();
syscore_shutdown();
}
_
Subject: Subject: reboot: disable nonboot CPUs
Patches currently in -mm which might be from per.forlin@xxxxxxxxxxxxxx are
reboot-disable-nonboot-cpus.patch
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