linux-kernel - Re: [PATCH] x86: make nx_enabled conditional on CONFIG_X86

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Date:	Tue, 22 Jan 2008 22:04:42 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Harvey Harrison <harvey.harrison@...il.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Ian Campbell <ijc@...lion.org.uk>,
	Mika Penttilä <mika.penttila@...umbus.fi>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] x86: make nx_enabled conditional on CONFIG_X86_PAE


* Harvey Harrison <harvey.harrison@...il.com> wrote:

> nx_enabled can only be set to non-zero when CONFIG_X86_PAE is set.  
> The only use not currently inside a CONFIG_X86_PAE block is the 
> definition, the declaration and a conditional unlikely test in 
> fault_32.c (is_prefetch).
> 
> When !CONFIG_X86_PAE, is_prefetch always returns 0 immediately as 
> nx_enabled is always 0.
> 
> When CONFIG_X86_PAE, the test is preserved, but the test against the 
> cpu model and stepping is deleted, this may not be correct.

thanks, applied.

> Ingo, further to your nx vs !nx comment, had this lying around, needs 
> testing, only affects the CONFIG_X86_PAE case.

will keep an eye on it.

How far away are you from unifying fault_32.c and fault_64.c? You 
already managed to line up their sizes:

$ wc -l arch/x86/mm/fault_*.c
  742 arch/x86/mm/fault_32.c
  734 arch/x86/mm/fault_64.c

;-)

and the raw diff between them doesnt look that bad either:

 1 file changed, 127 insertions(+), 135 deletions(-)

so we might as well take a shot at that?

	Ingo
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