linux-kernel - Re: enabling COMPILE_TEST support for GCC plugins in v4.11

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Date:   Sat, 10 Dec 2016 17:45:31 +0100
From:   Emese Revfy <re.emese@...il.com>
To:     Kees Cook <keescook@...gle.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Randy Dunlap <rdunlap@...radead.org>,
        Olof Johansson <olof@...om.net>,
        Mark Brown <broonie@...nel.org>, info@...nelci.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Will Deacon <will.deacon@....com>,
        Russell King - ARM Linux <linux@....linux.org.uk>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-Next <linux-next@...r.kernel.org>,
        Fengguang Wu <fengguang.wu@...el.com>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Laura Abbott <labbott@...hat.com>,
        "x86@...nel.org" <x86@...nel.org>, PaX Team <pageexec@...email.hu>
Subject: Re: enabling COMPILE_TEST support for GCC plugins in v4.11

On Fri, 9 Dec 2016 11:12:18 -0800
Kees Cook <keescook@...gle.com> wrote:

> On Fri, Dec 9, 2016 at 2:40 AM, Arnd Bergmann <arnd@...db.de> wrote:
> > On Thursday, December 8, 2016 11:00:42 AM CET Kees Cook wrote:
> >
> >> If you have a moment, applying 215e2aa6c024[1] and reverting
> >> a519167e753e for an allyesconfig/allmodconfig build should let you
> >> know if things are working correctly with headers installed. If anyone
> >> sees any problems, please let me know and I can queue up fixes.
> >
> > Using gcc-4.9.3 or gcc-5.3.1 for an ARM allmodconfig build, I get tons of
> > errors such as this one:
> >
> > /git/arm-soc/init/initramfs.c: In function 'error':
> > /git/arm-soc/init/initramfs.c:50:1: error: unrecognizable insn:
> >  }
> >  ^
> > (insn 26 25 27 5 (set (reg:SI 111 [ local_entropy.243 ])
> >         (rotatert:SI (reg:SI 116 [ local_entropy.243 ])
> >             (const_int -30 [0xffffffffffffffe2]))) -1
> >      (nil))
> > *** WARNING *** there are active plugins, do not report this as a bug unless you can reproduce it without enabling any plugins.
> > Event                            | Plugins
> > PLUGIN_ATTRIBUTES                | latent_entropy_plugin
> > PLUGIN_START_UNIT                | latent_entropy_plugin
> > /git/arm-soc/init/initramfs.c:50:1: internal compiler error: in extract_insn, at recog.c:2202
> > /git/arm-soc/arch/arm/vfp/vfpmodule.c: In function 'vfp_init':
> > /git/arm-soc/arch/arm/vfp/vfpmodule.c:824:1: error: unrecognizable insn:
> >  }
> >  ^
> > (insn 138 137 139 17 (set (reg:SI 165 [ local_entropy.93 ])
> >         (rotatert:SI (reg:SI 150 [ local_entropy.93 ])
> >             (const_int -9 [0xfffffffffffffff7]))) -1
> >      (nil))
> > *** WARNING *** there are active plugins, do not report this as a bug unless you can reproduce it without enabling any plugins.
> 
> Well that's exciting! :P

Hi,

You can find the fix here:
https://github.com/ephox-gcc-plugins/latent_entropy/commit/c91275a1bfcebbcfc0ca1af03396e06039f04db8

-- 
Emese