linux-kernel - Re: CONFIG_HIGHPTE vs. sub-page page tables.

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Date:	Sat, 09 Feb 2008 11:56:14 +0100
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: CONFIG_HIGHPTE vs. sub-page page tables.

On Sat, 2008-02-09 at 11:37 +0100, Ingo Molnar wrote:
> i think the worst is over already and i'm reasonably sure that there are 
> no more bugs in it - this _is_ a 1:1 patch after all, so in theory the 
> worst side-effect should be build breakages due to include file 
> spaghetti. The window for this particular breakage was just 256 commits, 
> that's OK i think.

Except for the breakage of all nommu architectures .. they need the
pgtable_t as well due to the pte_fn_t type.

> If you want less stress next time around you might want to consider 
> pushing such patches via individual architectures, so that it can all be 
> shaken out (and such build bugs are found quickly) and pushed via the 
> architecture trees. (Even such a patch that changes the number of 
> cross-arch function arguments and introduces a new type can be 
> architectured in a way to make it per arch.)

I'll try that with the __pte_free_tlb macro to inline conversion patch.
This one is really driving me nuts, the dependencies of the macros in
asm/pgalloc, asm/tlb.h and asm-generic/tlb.h for the different archs are
pure evil.

-- 
blue skies,
  Martin.

"Reality continues to ruin my life." - Calvin.


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