linux-kernel - Re: [PATCH -next 0/3] x86 insn decoder test updates (Re: linux-next: Tree for October 29 (x86 posttest))

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Date:	Tue, 17 Nov 2009 07:13:52 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	linux-next@...r.kernel.org,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Randy Dunlap <rdunlap@...otime.net>,
	Jim Keniston <jkenisto@...ibm.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>
Subject: Re: [PATCH -next 0/3] x86 insn decoder test updates (Re: linux-next:
 Tree for October 29 (x86 posttest))


* Masami Hiramatsu <mhiramat@...hat.com> wrote:

> Here are the patches which update x86 instruction decoder build-time 
> test. As Stephen reported on linux-next, sometimes objdump decodes bad 
> instructions as normal. This will cause a false positive result on x86 
> insn decoder test. This patches update the test as below;
>
>  - Show more information with V=1
>  - Show in which symbol the difference places.
>  - Just warning instead of build failure.

yes, -tip testing was showing such build bugs too:

 Error: ffffffff8104aae3:	c5 83 3d 49 80 ee    	lds    0xffffffffee80493d(%rbx),%eax
 Error: objdump says 6 bytes, but insn_get_length() says 3 (attr:0)

it happens with older tools, such as binutils-2.17. Modern binutils 
(2.19) is fine.

We dont want to remove the build error: it helped us fix a number of 
real bugs in the decoder - instead please try to create a make based 
workaround based on binutils, to not run the test with binutils older 
than 2.19 or so.

Thanks,

	Ingo
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