From: Greg Kroah-Hartman <gregkh@linux-foundation.org>
To: Guenter Roeck <linux@roeck-us.net>
Cc: stable@vger.kernel.org
Subject: Re: objtool patches needed in v4.14.y (and possibly older kernels)
Date: Fri, 19 Jan 2018 10:15:16 +0100 [thread overview]
Message-ID: <20180119091516.GA15969@kroah.com> (raw)
In-Reply-To: <20180119074925.GB25687@kroah.com>
On Fri, Jan 19, 2018 at 08:49:25AM +0100, Greg Kroah-Hartman wrote:
> On Thu, Jan 18, 2018 at 11:52:13AM -0800, Guenter Roeck wrote:
> > On Thu, Jan 18, 2018 at 02:59:50PM +0100, Greg Kroah-Hartman wrote:
> > > On Wed, Jan 17, 2018 at 01:49:07PM -0800, Guenter Roeck wrote:
> > > > Hi Greg,
> > > >
> > > > please add the following patches to v4.14.y.
> > > >
> > > > ce90aaf5cde4 objtool: Fix seg fault with clang-compiled objects
> > > > e7e83dd3ff1d objtool: Fix Clang enum conversion warning
> > > > 0f908ccbeca9 tools/objtool/Makefile: don't assume sync-check.sh is executable
> > > > d89e426499cf objtool: Fix seg fault caused by missing parameter
> > > >
> > > > They are needed to avoid problems when building v4.14.y with clang.
> > > > It might be useful to apply the same patches to older kernels
> > > > if/when retpoline related changes are applied to those kernels.
> > >
> > > From what I can tell, these only are needed for 4.14, the 4.9 and 4.4
> > > backports of repoline didn't backport the huge objtool changes to ORC.
> > > So hopefully it's all good there, otherwise I'm sure someone from the
> > > Android team will complain I broke building with CLANG :)
> > >
> >
> > Unfortunately, the problem is much worse: The Google toolchain with retpoline
> > support causes a crash with the latest version of objtool. No idea if that is
> > an objtool problem or a compiler problem; it was introduced with 'objtool:
> > Allow alternatives to be ignored'.
> >
> > You might also want to add
> >
> > 2a0098d70640 objtool: Fix seg fault with gold linker
> >
> > but that has a Fixes: tag and might be in your queue already.
>
> Nope, didn't catch that one, thanks for pointing it out.
Oops, yes, it is on my list, I just hadn't caught up with my list of
patches yet...
Ugh, what a mess.
greg k-h
prev parent reply other threads:[~2018-01-19 9:15 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-17 21:49 objtool patches needed in v4.14.y (and possibly older kernels) Guenter Roeck
2018-01-18 13:59 ` Greg Kroah-Hartman
2018-01-18 19:52 ` Guenter Roeck
2018-01-19 7:49 ` Greg Kroah-Hartman
2018-01-19 9:15 ` Greg Kroah-Hartman [this message]
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