linux-kernel - Re: [PATCH 1/2] powerpc/kdump: Add missing optional dummy functions

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Date:   Mon, 12 Feb 2018 15:25:51 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Balbir Singh <bsingharora@...il.com>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        "open list:LINUX FOR POWERPC (32-BIT AND 64-BIT)" 
        <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Nicholas Piggin <npiggin@...il.com>
Subject: Re: [PATCH 1/2] powerpc/kdump: Add missing optional dummy functions

On Tue, Feb 13, 2018 at 10:01:57AM +1100, Balbir Singh wrote:
> On Tue, Feb 13, 2018 at 9:34 AM, Guenter Roeck <linux@...ck-us.net> wrote:
> > If KEXEC_CORE is not enabled, PowerNV builds fail as follows.
> >
> > arch/powerpc/platforms/powernv/smp.c: In function 'pnv_smp_cpu_kill_self':
> > arch/powerpc/platforms/powernv/smp.c:236:4: error:
> >         implicit declaration of function 'crash_ipi_callback'
> >
> > Add dummy function calls, similar to kdump_in_progress(), to solve the
> > problem.
> >
> > Fixes: 4145f358644b ("powernv/kdump: Fix cases where the kdump kernel ...")
> > Cc: Balbir Singh <bsingharora@...il.com>
> > Cc: Michael Ellerman <mpe@...erman.id.au>
> > Cc: Nicholas Piggin <npiggin@...il.com>
> > Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> > ---
> 
> Thanks for working on this.
> 
> You've added two functions, I understand the crash_send_ipi() bits
> that I broke. Looks like crash_ipi_callback broken without KEXEC_CORE?
> 

If I recall correctly, 4145f358644b introduced the call to crash_ipi_callback().
After I declared the dummy function for that, I got an error about the missing
crash_send_ipi(). I didn't spend more time on it but just added another dummy
function. It may well be that another problem was introduced in the same time
frame. On the other side, maybe I got it all wrong, and my patch is not worth
the computer it was written on.

Thanks,
Guenter