RE: [PATCH] kexec: Fix CONFIG_SMP=n compilation (ia64)

Zou, Nanhai
2007-02-02T03:01:21Z

> -----Original Message-----
> From: linux-ia64-owner@vger.kernel.org
> [mailto:linux-ia64-owner@vger.kernel.org] On Behalf Of Magnus Damm
> Sent: 2007Äê2ÔÂ2ÈÕ 10:39
> To: Andrew Morton
> Cc: Magnus Damm; linux-kernel@vger.kernel.org; linux-ia64@vger.kernel.org;
> Luck, Tony; fastboot@lists.osdl.org
> Subject: Re: [PATCH] kexec: Fix CONFIG_SMP=n compilation (ia64)
>
> On 2/2/07, Andrew Morton <akpm@linux-foundation.org> wrote:
> >
> > (added ia64 list)
> > (added ia64 maintainer)
> > (added kexec list)
>
> Sorry about that.
>
> > On Thu, 01 Feb 2007 22:13:47 +0900
> > Magnus Damm <magnus@valinux.co.jp> wrote:
> >
> > > kexec: Fix CONFIG_SMP=n compilation (ia64)
> > >
> > > This patch makes it possible to compile kexec for ia64 without SMP support.
> > >
> >
> > Please always include the compiler stderr when fixing build errors or
> > warnings.
>
> Ok, will do. With CONFIG_SMP=n and CONFIG_HOTPLUG_CPU=n:
>
> CC arch/ia64/kernel/machine_kexec.o
> arch/ia64/kernel/machine_kexec.c: In function `machine_shutdown':
> arch/ia64/kernel/machine_kexec.c:77: warning: implicit declaration of
> function `cpu_down'
> AS arch/ia64/kernel/relocate_kernel.o
> CC arch/ia64/kernel/crash.o
> arch/ia64/kernel/crash.c: In function `kdump_cpu_freeze':
> arch/ia64/kernel/crash.c:139: warning: implicit declaration of
> function `ia64_jump_to_sal'
> arch/ia64/kernel/crash.c:139: error: `sal_boot_rendez_state'
> undeclared (first use in this function)
> arch/ia64/kernel/crash.c:139: error: (Each undeclared identifier is
> reported only once
> arch/ia64/kernel/crash.c:139: error: for each function it appears in.)
> arch/ia64/kernel/crash.c: At top level:
> arch/ia64/kernel/crash.c:84: warning: 'kdump_wait_cpu_freeze' defined
> but not used
> make[1]: *** [arch/ia64/kernel/crash.o] Error 1
> make: *** [arch/ia64/kernel] Error 2
> damm@localhost ~/build/kernel/linux-2.6.20-rc7 $
>
> > > --- 0002/arch/ia64/kernel/crash.c
> > > +++ work/arch/ia64/kernel/crash.c 2007-02-01 12:42:38.000000000
> +0900
> > > @@ -79,6 +79,7 @@ crash_save_this_cpu()
> > > final_note(buf);
> > > }
> > >
> > > +#ifdef CONFIG_SMP
> > > static int
> > > kdump_wait_cpu_freeze(void)
> > > {
> > > @@ -91,6 +92,7 @@ kdump_wait_cpu_freeze(void)
> > > }
> > > return 1;
> > > }
> > > +#endif
> >
> > I think this is a warning fix?
>
> Yes. The file already has some CONFIG_SMP #ifdeffery in it but not
> enough to compile properly.
>
> > > void
> > > machine_crash_shutdown(struct pt_regs *pt)
> > > @@ -132,11 +134,12 @@ kdump_cpu_freeze(struct unw_frame_info *
> > > atomic_inc(&kdump_cpu_freezed);
> > > kdump_status[cpuid] = 1;
> > > mb();
> > > - if (cpuid = 0) {
> > > - for (;;)
> > > - cpu_relax();
> > > - } else
> > > +#ifdef CONFIG_HOTPLUG_CPU
> > > + if (cpuid != 0)
> > > ia64_jump_to_sal(&sal_boot_rendez_state[cpuid]);
> > > +#endif
> > > + for (;;)
> > > + cpu_relax();
> > > }
> >
> > I trust ia64_jump_to_sal doesn't return.
>
> So do I. The main problem with the compilation seems to be that
> ia64_jump_to_sal() only exists if CONFIG_HOTPLUG_CPU=y.
> (include/asm-ia64/sal.h, arch/ia64/kernel/head.S)
>
This may cause problem on SN platform.
I remember SN requires cpu0 return to SAL rendez loop to do IRQ redirection.
However this needs SGI people to confirm...

Thanks
Zou Nan hai

>
> Thanks!
>
> / magnus
> -
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