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Message-ID: <20150718160021.GC19968@treble.redhat.com>
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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