linux-kernel - Re: [git-pull -tip V2] x86: cpu architecture debug code

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Date:	Wed, 11 Mar 2009 14:48:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [git-pull -tip V2] x86: cpu architecture debug code


* Jaswinder Singh Rajput <jaswinder@...nel.org> wrote:

> On Wed, 2009-03-11 at 14:13 +0100, Ingo Molnar wrote:
> > * Ingo Molnar <mingo@...e.hu> wrote:
> > 
> > > * Jaswinder Singh Rajput <jaswinder@...nel.org> wrote:
> > > 
> > > > @@ -472,7 +473,7 @@ static void print_dt(void *seq)
> > > >  	print_desc_ptr("GDT", seq, dt);
> > > >  
> > > >  	/* LDT */
> > > > -	store_ldt(ldt);
> > > > +	asm volatile("sldt %0" : "=m" (ldt));
> > > 
> > > this is still wrong.
> > 
> > As i pointed it out before, we should not open-code an assembly 
> > primitive - especially since store_ldt() is available in 
> > arch/x86/include/asm/desc.h.
> > 
> > True, that primitive is not available on CONFIG_PARAVIRT, but 
> > that is a bug: the fix is to move the store_ldt() definition 
> > outside the CONFIG_PARAVIRT section in desc.h, not to hack 
> > around the problem by open-coding assembly code.
> > 
> > I.e. dont let an uncleanliness and incomplete primitive spread 
> > to other code. Fix the primitive and remove the uncleanliness 
> > that way.
> > 
> 
> The following changes since commit 259ef6fcea4046fe24495b1e3631c1b905c531c1:
>   Jaswinder Singh Rajput (1):
>         x86: cpu architecture debug code
> 
> are available in the git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/jaswinder/linux-2.6-tip-cpu.git master
> 
> Jaswinder Singh Rajput (2):
>       x86: cpu_debug.c cleanup
>       x86: move store_ldt outside the CONFIG_PARAVIRT section
> 
>  arch/x86/include/asm/desc.h     |    3 ++-
>  arch/x86/kernel/cpu/cpu_debug.c |    3 ++-
>  2 files changed, 4 insertions(+), 2 deletions(-)

this throws rejects when pulled into tip:x86/debug:

earth4:~/tip> git pull git://git.kernel.org/pub/scm/linux/kernel/git/jaswinder/linux-2.6-tip-cpu.git master
>From 
git://git.kernel.org/pub/scm/linux/kernel/git/jaswinder/linux-2.6-tip-cpu
 * branch            master     -> FETCH_HEAD

Removing Documentation/scheduler/sched-coding.txt
Removing arch/ia64/dig/dig_vtd_iommu.c
Auto-merging arch/x86/Kconfig
Removing arch/x86/include/asm/intel_arch_perfmon.h
Auto-merging arch/x86/kernel/cpu/Makefile
Auto-merging arch/x86/kernel/cpu/cpu_debug.c
CONFLICT (add/add): Merge conflict in 
arch/x86/kernel/cpu/cpu_debug.c
Removing block/blktrace.c
Automatic merge failed; fix conflicts and then commit the 
result.

you should base your branch on tip:x86/debug, and you should not 
merge in anything else, but do the fixes.

	Ingo
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