linux-kernel - Re: [tip:core/objtool] objtool: Add CONFIG_STACK

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Date:	Thu, 3 Mar 2016 08:56:55 -0600
From:	Josh Poimboeuf <jpoimboe@...hat.com>
To:	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
Cc:	jslaby@...e.cz, acme@...nel.org, chris.j.arges@...onical.com,
	hpa@...or.com, namhyung@...il.com, palves@...hat.com, bp@...en8.de,
	luto@...nel.org, torvalds@...ux-foundation.org,
	bernd@...rovitsch.priv.at, mmarek@...e.cz,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mingo@...nel.org, peterz@...radead.org, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:core/objtool] objtool: Add CONFIG_STACK_VALIDATION option

On Thu, Mar 03, 2016 at 03:12:01PM +0100, Sebastian Andrzej Siewior wrote:
> On 2016-02-29 03:01:35 [-0800], tip-bot for Josh Poimboeuf wrote:
> > Gitweb:     http://git.kernel.org/tip/b9ab5ebb14ec389bd80f66613f1fe3f8f65f2521
> > Author:     Josh Poimboeuf <jpoimboe@...hat.com>
> > objtool: Add CONFIG_STACK_VALIDATION option
> > 
> > Add a CONFIG_STACK_VALIDATION option which will run "objtool check" for
> > each .o file to ensure the validity of its stack metadata.
> 
> |./mk-x86-64.sh -j1
> |make[1]: Entering directory '/home/bigeasy/linux-tip/build/linux-x8664'
> |  CHK     include/config/kernel.release
> |  Using /home/bigeasy/linux-tip as source for kernel
> |  GEN     ./Makefile
> |  CHK     include/generated/uapi/linux/version.h
> |  CHK     include/generated/utsrelease.h
> |  CHK     include/generated/bounds.h
> |  CHK     include/generated/timeconst.h
> |  CHK     include/generated/asm-offsets.h
> |  CALL    /home/bigeasy/linux-tip/scripts/checksyscalls.sh
> |scripts/Makefile.include:3: *** O=build/linux-x8664 does not exist.  Stop.
> |/home/bigeasy/linux-tip/Makefile:1518: recipe for target 'tools/objtool' failed
> |make[1]: *** [tools/objtool] Error 2
> |make[1]: Leaving directory '/home/bigeasy/linux-tip/build/linux-x8664'
> |Makefile:146: recipe for target 'sub-make' failed
> |make: *** [sub-make] Error 2
> 
> with
> |$ cat mk-x86-64.sh 
> |#!/bin/sh
> |export PATH=/usr/lib/ccache/:$PATH
> |exec make O=build/linux-x8664 -j 8 $*
> 
> Is this know? I tried the TIP tree as of now. It works with
> CONFIG_STACK_VALIDATION=n
> 
> Sebastian

Hi Sebastian,

This bug happens when using a relative path for 'O=' with
CONFIG_STACK_VALIDATION.  I posted a patch to fix it:

  https://lkml.kernel.org/r/94a078c6c998fac9f01a14f574008bf7dff40191.1457016803.git.jpoimboe@redhat.com

-- 
Josh