linux-kernel - RE: [PATCH 1/3] panic: Export panic_cpu and nmi_panic_self

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Date:	Tue, 1 Mar 2016 07:48:10 +0000
From:	河合英宏 / KAWAI，HIDEHIRO 
	<hidehiro.kawai.ez@...achi.com>
To:	"'Borislav Petkov'" <bp@...en8.de>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Mingarelli <thomas.mingarelli@....com>,
	Wim Van Sebroeck <wim@...ana.be>,
	Corey Minyard <minyard@....org>,
	Michal Hocko <mhocko@...e.com>,
	"linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Michal Hocko <mhocko@...nel.org>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>,
	Tejun Heo <tj@...nel.org>,
	"openipmi-developer@...ts.sourceforge.net" 
	<openipmi-developer@...ts.sourceforge.net>,
	Borislav Petkov <bp@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: RE: [PATCH 1/3] panic: Export panic_cpu and nmi_panic_self_stop

Hi Borislav,

> From: Borislav Petkov [mailto:bp@...en8.de]
> On Tue, Mar 01, 2016 at 10:50:37AM +0900, Hidehiro Kawai wrote:
> > Export panic_cpu and nmi_panic_self_stop symbols for modules which
> > use nmi_panic() macro.
> >
> > Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>
> > Cc: Andrew Morton <akpm@...ux-foundation.org>
> > Cc: Borislav Petkov <bp@...e.de>
> > Cc: Thomas Gleixner <tglx@...utronix.de>
> > Cc: Michal Hocko <mhocko@...e.com>
> > Cc: HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
> > Cc: Vitaly Kuznetsov <vkuznets@...hat.com>
> > Cc: Tejun Heo <tj@...nel.org>
> > ---
> >  kernel/panic.c |    2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/kernel/panic.c b/kernel/panic.c
> > index d96469d..f4e8035 100644
> > --- a/kernel/panic.c
> > +++ b/kernel/panic.c
> > @@ -69,8 +69,10 @@ void __weak nmi_panic_self_stop(struct pt_regs *regs)
> >  {
> >  	panic_smp_self_stop();
> >  }
> > +EXPORT_SYMBOL(nmi_panic_self_stop);
> >
> >  atomic_t panic_cpu = ATOMIC_INIT(PANIC_CPU_INVALID);
> > +EXPORT_SYMBOL(panic_cpu);
> 
> Can we make nmi_panic() at least a proper function and export that
> instead of exporting all those implementation details...?

The reason I implemented nmi_panic() as a macro is to pass
variable arguments directly to panic().  Fortunately, since all
invocations of nmi_panic() just pass a fixed string, I can change it
to a normal function like:

int nmi_panic(struct pt_regs *regs, const char *msg)
{
...
	panic("%s", msg);

If people don't mind if that, I'll change it.

Regards,

--
Hidehiro Kawai
Hitachi, Ltd. Research & Development Group