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

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Date:   Mon, 11 Sep 2017 20:19:46 -0700
From:   Max Filippov <jcmvbkbc@...il.com>
To:     Guenter Roeck <linux@...ck-us.net>
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 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

-- 
Thanks.
-- Max