The patch titled
Subject: kernel/smp.c: tell the user we're bringing up secondary CPUs
has been added to the -mm tree. Its filename is
kernel-smp-tell-the-user-were-bringing-up-secondary-cpus.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kernel-smp-tell-the-user-were-bringing-up-secondary-cpus.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kernel-smp-tell-the-user-were-bringing-up-secondary-cpus.patch
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------------------------------------------------------
From: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Subject: kernel/smp.c: tell the user we're bringing up secondary CPUs
Currently we don't print anything before starting to bring up secondary
CPUs. This can be confusing if it takes a long time to bring up the
secondaries, or if the kernel crashes while doing so and produces no
further output.
On x86 they work around this by detecting when the first secondary CPU
comes up and printing a message (see announce_cpu()). But doing it in
smp_init() is simpler and works for all arches.
Link: http://lkml.kernel.org/r/1477460275-8266-3-git-send-email-mpe@xxxxxxxxxxxxxx
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Reviewed-by: Borislav Petkov <bp@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Juergen Gross <jgross@xxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Richard Weinberger <richard@xxxxxx>
Cc: Len Brown <len.brown@xxxxxxxxx>
Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Cc: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/smp.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN kernel/smp.c~kernel-smp-tell-the-user-were-bringing-up-secondary-cpus kernel/smp.c
--- a/kernel/smp.c~kernel-smp-tell-the-user-were-bringing-up-secondary-cpus
+++ a/kernel/smp.c
@@ -555,6 +555,8 @@ void __init smp_init(void)
idle_threads_init();
cpuhp_threads_init();
+ pr_info("Bringing up secondary CPUs ...\n");
+
/* FIXME: This should be done in userspace --RR */
for_each_present_cpu(cpu) {
if (num_online_cpus() >= setup_max_cpus)
_
Patches currently in -mm which might be from mpe@xxxxxxxxxxxxxx are
kernel-smp-define-pr_fmt-for-smpc.patch
kernel-smp-make-the-smp-boot-message-common-on-all-arches.patch
kernel-smp-tell-the-user-were-bringing-up-secondary-cpus.patch
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