linux-kernel - Re: xtensa compiler error triggered by 'locking/lockdep: Implement the 'crossrelease' feature'

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Message-ID: <20170913184900.GA2385@roeck-us.net>
Date:   Wed, 13 Sep 2017 11:49:00 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Max Filippov <jcmvbkbc@...il.com>
Cc:     Byungchul Park <byungchul.park@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Chris Zankel <chris@...kel.net>,
        "linux-xtensa@...ux-xtensa.org" <linux-xtensa@...ux-xtensa.org>
Subject: Re: xtensa compiler error triggered by 'locking/lockdep: Implement
 the 'crossrelease' feature'

On Mon, Sep 11, 2017 at 08:19:46PM -0700, Max Filippov wrote:
> On Sun, Sep 10, 2017 at 6:58 PM, Max Filippov <jcmvbkbc@...il.com> wrote:
> > On Sun, Sep 10, 2017 at 11:31 AM, Guenter Roeck <linux@...ck-us.net> wrote:
> >> xtensa:allmodconfig fails to build in mainline with compiler errors
> >> as follows.
> >>
> >> drivers/staging/rtl8723bs/core/rtw_ap.c: In function ‘expire_timeout_chk’:
> >> drivers/staging/rtl8723bs/core/rtw_ap.c:442:1: internal compiler error:
> >>         in change_address_1, at emit-rtl.c:2126
> >>
> >> drivers/staging/rtl8188eu/core/rtw_ap.c: In function ‘expire_timeout_chk’:
> >> drivers/staging/rtl8188eu/core/rtw_ap.c:445:1: internal compiler error:
> >>         in change_address_1, at emit-rtl.c:2150
> >>
> >> I tried gcc 6.3, 6.4, and 7.2; they all have the same problem.
> >>
> >> Bisect points to commit b09be676e0f ("locking/lockdep: Implement the
> >> 'crossrelease' feature").
> >>
> >> The compile error is still seen if I disable CONFIG_LOCKDEP_CROSSRELEASE.
> >> The image builds fine if I disable both CONFIG_RTL8723BS and CONFIG_R8188EU.
> >
> > Thanks for the report. I'll look at the compiler.
> 
> There was a bug in the xtensa gcc backend, now fixed. See
>  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82181
> 
xtensa:allmodconfig builds fine with patched gcc-7.2.0.

Thanks a lot for the quick fix!

Guenter