linux-kernel - Re: [PATCH 4/25] [PATCH] Add debugreg/load

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Date:	Thu, 9 Aug 2007 02:49:46 -0300
From:	"Glauber de Oliveira Costa" <glommer@...il.com>
To:	"Andi Kleen" <ak@...e.de>
Cc:	"Glauber de Oliveira Costa" <gcosta@...hat.com>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	rusty@...tcorp.com.au, mingo@...e.hu, chrisw@...s-sol.org,
	jeremy@...p.org, avi@...ranet.com, anthony@...emonkey.ws,
	virtualization@...ts.linux-foundation.org, lguest@...abs.org,
	"Steven Rostedt" <rostedt@...dmis.org>
Subject: Re: [PATCH 4/25] [PATCH] Add debugreg/load_rsp native hooks

On 8/8/07, Andi Kleen <ak@...e.de> wrote:
>
> >
> > @@ -264,13 +270,64 @@ struct thread_struct {
> >       set_fs(USER_DS);                                                         \
> >  } while(0)
> >
> > -#define get_debugreg(var, register)                          \
> > -             __asm__("movq %%db" #register ", %0"            \
> > -                     :"=r" (var))
> > -#define set_debugreg(value, register)                        \
> > -             __asm__("movq %0,%%db" #register                \
> > -                     : /* no output */                       \
> > -                     :"r" (value))
> > +static inline unsigned long native_get_debugreg(int regno)
> > +{
> > +     unsigned long val;
>
> It would be better to have own functions for each debug register I think
>
Andi, you mean:
a) split the debugreg paravirt_ops in various
paravirt_ops.set/get_debugreg{X,Y,Z...}, and then join them together
in a set/get_debugreg(a,b) to keep the current interface. OR
b) keep one paravirt_ops for each set/get_debugreg, then split then in
various set/get_debugregX(a, b), changing the current interface, OR
c) plit the debugreg paravirt_ops in various
paravirt_ops.set/get_debugreg{X,Y,Z...}, and give each its own
function set/get_debugregX(a, b), again, changing the current
interface, OR
d) None of the above?

-- 
Glauber de Oliveira Costa.
"Free as in Freedom"
http://glommer.net

"The less confident you are, the more serious you have to act."
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