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SubjectRe: [PATCH] kexec: quiet down kexec reboot
On 04/25/19 at 05:32pm, Baoquan He wrote:
> On 04/23/19 at 04:41pm, Pavel Tatashin wrote:
> > Here is a regular kexec command sequence and output:
> > =====
> > $ kexec --reuse-cmdline -i --load Image
> > $ kexec -e
> > [ 161.342002] kexec_core: Starting new kernel
> >
> > Welcome to Buildroot
> > buildroot login:
> > =====
> >
> > Even when "quiet" kernel parameter is specified, "kexec_core: Starting
> > new kernel" is printed.
>
> I personally don't like this change very much.
>
> kernel-parameters.txt tells that quiet disables most log messages, but
> not to disable log messages.
>
> quiet [KNL] Disable most log messages
>
> And kexec doesn't print many messages. When 'kexec -e' is executed,
> much critical work need be done in 1st kernel, and also in 2nd kernel
> till printed messages are seen. Sometime it could hang there without a
> notice, because we need shutdown all devices before it. Keeping it can
> at least tell which stage it is?
>
> No strong objection, just we may need enable it manually if silent
> hang is met. Anyone has different opinion?

Please ignore this mail, I must be dizzy. pr_notice looks good to me.

> >
> > This message has KERN_EMERG level, but there is no emergency, it is
> > a normal kexec operation, so quiet it down to appropriate KERN_NOTICE.
> >
> > Machines that have slow console baud rate benefit from less output.
> >
> > Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
> > ---
> > kernel/kexec_core.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
> > index d7140447be75..fe13e86984ec 100644
> > --- a/kernel/kexec_core.c
> > +++ b/kernel/kexec_core.c
> > @@ -1171,7 +1171,7 @@ int kernel_kexec(void)
> > * CPU hotplug again; so re-enable it here.
> > */
> > cpu_hotplug_enable();
> > - pr_emerg("Starting new kernel\n");
> > + pr_notice("Starting new kernel\n");
> > machine_shutdown();
> > }
> >
> > --
> > 2.21.0
> >
> >
> > _______________________________________________
> > kexec mailing list
> > kexec@lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/kexec
>
> _______________________________________________
> kexec mailing list
> kexec@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/kexec

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