The patch titled
Subject: stop_machine: make stop_machine safe and efficient to call early
has been added to the -mm tree. Its filename is
stop_machine-make-stop_machine-safe-and-efficient-to-call-early.patch
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------------------------------------------------------
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: stop_machine: make stop_machine safe and efficient to call early
Make stop_machine() safe to call early in boot, before SMP has been set
up, by simply calling the callback function directly if there's only one
CPU online.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
Cc: Tejun Heo <htejun@xxxxxxxxx>
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxx>
---
kernel/stop_machine.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff -puN kernel/stop_machine.c~stop_machine-make-stop_machine-safe-and-efficient-to-call-early kernel/stop_machine.c
--- a/kernel/stop_machine.c~stop_machine-make-stop_machine-safe-and-efficient-to-call-early
+++ a/kernel/stop_machine.c
@@ -485,6 +485,17 @@ int __stop_machine(int (*fn)(void *), vo
.num_threads = num_online_cpus(),
.active_cpus = cpus };
+ if (smdata.num_threads == 1) {
+ unsigned long flags;
+ int ret;
+
+ local_save_flags(flags);
+ ret = (*fn)(data);
+ local_irq_restore(flags);
+
+ return ret;
+ }
+
/* Set the initial state and stop all online cpus. */
set_state(&smdata, STOPMACHINE_PREPARE);
return stop_cpus(cpu_online_mask, stop_machine_cpu_stop, &smdata);
_
Subject: Subject: stop_machine: make stop_machine safe and efficient to call early
Patches currently in -mm which might be from jeremy@xxxxxxxx are
origin.patch
linux-next.patch
stop_machine-make-stop_machine-safe-and-efficient-to-call-early.patch
stop_machine-make-stop_machine-safe-and-efficient-to-call-early-fix.patch
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