linux-kernel - Re: mmotm 2008-10-02-16-17 uploaded

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Message-Id: <20081008084753.f1a4fc2e.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 8 Oct 2008 08:47:53 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	"mingo@...e.hu" <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: mmotm 2008-10-02-16-17 uploaded

On Tue, 07 Oct 2008 09:18:03 -0700
Yinghai Lu <yinghai@...nel.org> wrote:

> KAMEZAWA Hiroyuki wrote:
> > I'm sorry if alread fixed.
> > 
> > Folloing function in git-x86.patch touches invalid address.
> > ==
> > +void __init early_cpu_init(void)
> > +{
> > +       struct cpu_dev **cdev;
> > +       int count = 0;
> > +
> > +       printk("KERNEL supported cpus:\n");
> > +       for (cdev = __x86_cpu_dev_start; cdev < __x86_cpu_dev_end; cdev++) {
> > +               struct cpu_dev *cpudev = *cdev;
> > +               unsigned int j;
> > +
> > +               if (count >= X86_VENDOR_NUM)
> > +                       break;
> > +               cpu_devs[count] = cpudev;
> > +               count++;
> > +
> > +               for (j = 0; j < 2; j++) {
> > +                       if (!cpudev->c_ident[j])
> > +                               continue;
> > +                       printk("  %s %s\n", cpudev->c_vendor,
> > +                               cpudev->c_ident[j]);
> > +               }
> > +       }
> > +
> > +       early_identify_cpu(&boot_cpu_data);
> >  }
> > ==
> > printk("  %s %s\n", cpudev->c_vendor, cpudev->c_ident[j]);
> > touches invalid address. (following is printk() result by
> > replacing %s with %p.
> > ==
> >   ffffffff8066e38a ffffffff8066e383
> >   ffffffff8066e3ab ffffffff8066e3a2
> >   ffffffff8066e3af ffffffff8066e3b7
> >   807064c0c7c74855 08ec834853e58948
> >   807064c0c7c74855 74c085fffffe9fe8
> > ==
> > and the kernel never boots on my box.
> 
> could be merging problem again.
> 
> please check in arch/x86/kernel/vmliux_64.lds.S
> 
> it should be like 
> 
>   __con_initcall_end = .;
>   __x86_cpu_dev_start = .;
>   .x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
>         *(.x86_cpu_dev.init)
>   }
>   __x86_cpu_dev_end = .;
> 
>   DYN_ARRAY_INIT(8)
> 
>   SECURITY_INIT
> 
Oh, yes. like this.
==
 __con_initcall_end = .;
  __x86_cpu_dev_start = .;
  .x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
        *(.x86_cpu_dev.init)
  }
  SECURITY_INIT
  __x86_cpu_dev_end = .;
==

I'll try next version when it comes.

Thanks,
-Kame







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