linux-kernel - Re: [PATCH 1/5] x86: Move enabling of PSE and PGE out of init_memory

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Date:	Fri, 24 Aug 2012 23:15:42 -0500
From:	Jacob Shin <jacob.shin@....com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	X86-ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>, Dave Young <dyoung@...hat.com>,
	Chao Wang <chaowang@...hat.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Borislav Petkov <borislav.petkov@....com>
Subject: Re: [PATCH 1/5] x86: Move enabling of PSE and PGE out of
 init_memory_mapping

On Fri, Aug 24, 2012 at 07:06:42PM -0700, Yinghai Lu wrote:
> On Fri, Aug 24, 2012 at 6:49 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> > On Fri, Aug 24, 2012 at 6:25 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> >> On Fri, Aug 24, 2012 at 4:55 PM, Jacob Shin <jacob.shin@....com> wrote:
> >>> Depending on the platform, init_memory_mapping() may be called multiple
> >>> times. Move it out to setup_arch() to avoid writing to cr4 on every call.
> >>>
> >>> Signed-off-by: Jacob Shin <jacob.shin@....com>
> >>> ---
> >>>  arch/x86/kernel/setup.c |   10 ++++++++++
> >>>  arch/x86/mm/init.c      |   10 ----------
> >>>  2 files changed, 10 insertions(+), 10 deletions(-)
> >>>
> >>> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> >>> index f4b9b80..751e020 100644
> >>> --- a/arch/x86/kernel/setup.c
> >>> +++ b/arch/x86/kernel/setup.c
> >>> @@ -913,6 +913,16 @@ void __init setup_arch(char **cmdline_p)
> >>>
> >>>         init_gbpages();
> >>>
> >>> +       /* Enable PSE if available */
> >>> +       if (cpu_has_pse)
> >>> +               set_in_cr4(X86_CR4_PSE);
> >>> +
> >>> +       /* Enable PGE if available */
> >>> +       if (cpu_has_pge) {
> >>> +               set_in_cr4(X86_CR4_PGE);
> >>> +               __supported_pte_mask |= _PAGE_GLOBAL;
> >>> +       }
> >>> +
> >>
> >> please don't put it directly in setup_arch().
> >>
> >> and another function.
> >>
> >
> > Jacob, hpa
> >
> > can you use attached one to replace the first patch?
> 
> Please use attached two instead.

Hmm .. okay I'll test with these two patches applied on Monday ..

> 
> Thanks
> 
> Yinghai




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