Re: [BUG][Resend] 2.6.12-rc3-mm3: Kernel BUG at "mm/slab.c":1219 [update]

[Andi Kleen <ak@suse.de>]

On Tue, May 10, 2005 at 02:44:47PM -0700, Christoph Lameter wrote:
> On Tue, 10 May 2005, Andi Kleen wrote:
> 
> > Better just add the section to x86-64. Should be easy by copying the
> > change from the i386 patch.
> 
> Something like this?
> 
> Index: linux-2.6.11/arch/x86_64/kernel/vmlinux.lds.S
> ===================================================================
> --- linux-2.6.11.orig/arch/x86_64/kernel/vmlinux.lds.S	2005-05-10 13:35:24.000000000 -0700
> +++ linux-2.6.11/arch/x86_64/kernel/vmlinux.lds.S	2005-05-10 13:44:26.000000000 -0700
> @@ -42,6 +42,13 @@ SECTIONS
>  	CONSTRUCTORS
>  	}
> 
> +  . = ALIGN(32);

This should be . = ALIGN(CONFIG_X86_L1_CACHE_BYTES)

It was wrong on i386 already btw, which needs the same.

> +  .data.cacheline_aligned : { (.data.cacheline_aligned) }
> +
> +  /* Rarely changed data like cpu maps */
> +  . = ALIGN(4096);

Does it really need an 4096 byte alignment? That seems like
a waste of memory. Cache line alignment should be enough.

> +  .data.mostly_readonly : { *(.data.mostly_readonly) }
> +
>    _edata = .;			/* End of data section */
> 
>    __bss_start = .;		/* BSS */
> 
> > Ideally it would be asm-generic/vmlinux.lds and cover everybody...
> 
> Hmm.. Add a definition for ALIGNED_DATA ?

Thinking about it again there is no portable way to do the cacheline
alignment yet, so drop that suggestion please.

-Andi
>