linux-kernel - Re: slab: setup allocators earlier in the boot sequence

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Message-Id: <1244770230.7172.4.camel@pasglop>
Date:	Fri, 12 Jun 2009 11:30:30 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: slab: setup allocators earlier in the boot sequence

On Thu, 2009-06-11 at 19:59 +0000, Linux Kernel Mailing List wrote:
> Gitweb:     http://git.kernel.org/linus/83b519e8b9572c319c8e0c615ee5dd7272856090
> Commit:     83b519e8b9572c319c8e0c615ee5dd7272856090
> Parent:     c91c4773b334d4d3a6d44626dc2a558ad97b86f3
> Author:     Pekka Enberg <penberg@...helsinki.fi>
> AuthorDate: Wed Jun 10 19:40:04 2009 +0300
> Committer:  Pekka Enberg <penberg@...helsinki.fi>
> CommitDate: Thu Jun 11 19:15:56 2009 +0300
> 
>     slab: setup allocators earlier in the boot sequence
>     
>     This patch makes kmalloc() available earlier in the boot sequence so we can get
>     rid of some bootmem allocations. The bulk of the changes are due to
>     kmem_cache_init() being called with interrupts disabled which requires some
>     changes to allocator boostrap code.
>     
>     Note: 32-bit x86 does WP protect test in mem_init() so we must setup traps
>     before we call mem_init() during boot as reported by Ingo Molnar:

This seem to explode in various places on powerpc :-(

It would have been nice if we had enough advance warning to actually fix
our archs too ... I had no idea it was going to be merged that soon. I
did plan to dig into this at some stage but that was too soon. Maybe it
should have been a CONFIG option for a couple of -rc's ?

But yeah, of course, only x86 matters right ? We can break everybody
else and fuck up bisection just for fun...

Cheers,
Ben.


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