linux-kernel - Re: [RFC PATCH 02/21] stackvalidate: Add C version of STACKVALIDATE_IGNORE

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Date:	Sat, 18 Jul 2015 11:00:21 -0500
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Michal Marek <mmarek@...e.cz>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Pedro Alves <palves@...hat.com>, x86@...nel.org,
	live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 02/21] stackvalidate: Add C version of
 STACKVALIDATE_IGNORE_INSN

On Sat, Jul 18, 2015 at 04:56:54PM +0200, Borislav Petkov wrote:
> On Fri, Jul 17, 2015 at 11:47:18AM -0500, Josh Poimboeuf wrote:
> > Add a C inline asm string version of the STACKVALIDATE_IGNORE_INSN macro
> > which tells stackvalidate to ignore the subsequent instruction.
> > 
> > Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
> > ---
> >  arch/x86/include/asm/stackvalidate.h | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> > 
> > diff --git a/arch/x86/include/asm/stackvalidate.h b/arch/x86/include/asm/stackvalidate.h
> > index 2d23c23..dac935c 100644
> > --- a/arch/x86/include/asm/stackvalidate.h
> > +++ b/arch/x86/include/asm/stackvalidate.h
> > @@ -23,6 +23,15 @@
> >  	.endif
> >  .endm
> >  
> > +#else /* !__ASSEMBLY__ */
> > +
> 
> #ifdef CONFIG_STACK_VALIDATION
> 
> > +#define STACKVALIDATE_IGNORE_INSN				\
> > +	".Ltemp" __stringify(__LINE__) ":;"			\
> > +	".pushsection __stackvalidate_ignore_insn, \"a\";"	\
> > +	_ASM_ALIGN ";"						\
> > +	".long .Ltemp" __stringify(__LINE__) " - .;"		\
> > +	".popsection;"
> > +
> 
> #endif
> 
> 
> Also, you should end your lines with "\n" so that the .s output looks
> a bit more readable, not like now:
> 
> #APP
> # 30 "./arch/x86/include/asm/arch_hweight.h" 1
>         661:
>         .Ltemp32:;.pushsection __stackvalidate_ignore_insn, "a"; .balign 8 ;.long .Ltemp32 - .;.popsection;call __sw_hweight32
> 662:

Ok, will fix both issues.  Thanks.

-- 
Josh
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