Re: [lkdump-develop] Re: [ANNOUNCE 0/7] Diskdump 1.0 Release

[Itsuro Oda]

Hi,

On 30 Nov 2004 15:56:45 +0530
Vivek Goyal <vgoyal@xxxxxxxxxx> wrote:

> 
> Now kexec based dump is in -mm tree. Could you please have a look at the
> code and point out if any problems you see.

(I looked 2.6.10-rc1-mm3.)

At first crash_machine_kexec() should be called before bust_spinlock(0)
in the panic() function :-)

In disable_IO_APIC() (this is called from crash_dump_stop_cpus())
spin_lock_irqsave(&ioapic_lock, flags) is required. It may be cause
a deadlock. (The other CPU may be stoped with this lock hold.)

It seems no lock required except the point mentioned above from
crash_machine_kexec called to jumping the new kernel. I feel it is
fine.

(BTW. The disconnect_bsp_APIC() in the crash_dump_stop_cpus() 
 is called twice if both CONFIG_X86_IO_APIC and CONFIG_X86_LOCAL_APIC
 are set. The code is beter as follows.
#if defined(CONFIG_X86_IO_APIC)
        disable_IO_APIC();
#elif defined(CONFIG_X86_LOCAL_APIC)
        disconnect_bsp_APIC();
#endif
)

Thank you.
-- 
Itsuro ODA <oda@xxxxxxxxxxxxx>

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