On 2/2/07, Andrew Morton <[EMAIL PROTECTED]> wrote:
(added ia64 list)
(added ia64 maintainer)
(added kexec list)
Sorry about that.
On Thu, 01 Feb 2007 22:13:47 +0900
Magnus Damm <[EMAIL PROTECTED]> 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
[EMAIL PROTECTED] ~/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)
> static int
> --- 0002/arch/ia64/kernel/machine_kexec.c
> +++ work/arch/ia64/kernel/machine_kexec.c 2007-02-01 12:35:46.000000000
+0900
> @@ -70,12 +70,14 @@ void machine_kexec_cleanup(struct kimage
>
> void machine_shutdown(void)
> {
> +#ifdef CONFIG_SMP
> int cpu;
>
> for_each_online_cpu(cpu) {
> if (cpu != smp_processor_id())
> cpu_down(cpu);
> }
> +#endif
> kexec_disable_iosapic();
> }
hm. I suspect this one should have been #ifndef CONFIG_HOTPLUG_CPU?
Yes, you are right.
Maybe we can replace the entire code block above with smp_send_stop()
later on? That would make the code more similar to the i386 and x86_64
code.
I was wondering if we should have stubs for cpu_down() if !CONFIG_HOTPLUG_CPU,
but perhaps that doesn't make sense.
cpu_down() is only used in a few places so I don't think it's worth it.
I wonder why cpu_down() isn't marked as __cpuexit. Maybe because it is
already wrapped in CONFIG_HOTPLUG_CPU.
Thanks!
/ magnus
-
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