linux-kernel - Re: [PATCH] arch/{mips,sparc,microblaze,powerpc}: Don't enable pagefault/preempt twice

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Message-ID: <784aacd2-663f-cc82-39be-c46fa6bafd6e@roeck-us.net>
Date:   Thu, 4 Jun 2020 02:38:38 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Ira Weiny <ira.weiny@...el.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...nel.org>, linux-kernel@...r.kernel.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        "David S. Miller" <davem@...emloft.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        Dan Williams <dan.j.williams@...el.com>,
        linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, sparclinux@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, dri-devel@...ts.freedesktop.org,
        Christian Koenig <christian.koenig@....com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH] arch/{mips,sparc,microblaze,powerpc}: Don't enable
 pagefault/preempt twice

On 6/3/20 11:22 PM, Ira Weiny wrote:
[ ... ]
> 
> s390: (does not compile)
> 
> <stdin>:1511:2: warning: #warning syscall clone3 not implemented [-Wcpp]
> In file included from ./arch/sparc/include/asm/bug.h:6:0,
>                  from ./include/linux/bug.h:5,
>                  from ./include/linux/mmdebug.h:5,
>                  from ./include/linux/mm.h:9,
>                  from mm/huge_memory.c:8:
> mm/huge_memory.c: In function 'hugepage_init':
> ./include/linux/compiler.h:403:38: error: call to '__compiletime_assert_127' declared with attribute error: BUILD_BUG_ON failed: ((13 + (13-3))-13) >= 9
>   _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>                                       ^
> ./include/linux/compiler.h:384:4: note: in definition of macro '__compiletime_assert'
>     prefix ## suffix();    \
>     ^~~~~~
> ./include/linux/compiler.h:403:2: note: in expansion of macro '_compiletime_assert'
>   _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>   ^~~~~~~~~~~~~~~~~~~
> ./include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
>  #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
>                                      ^~~~~~~~~~~~~~~~~~
> ./include/linux/build_bug.h:50:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
>   BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition)
>   ^~~~~~~~~~~~~~~~
> ./include/linux/bug.h:24:4: note: in expansion of macro 'BUILD_BUG_ON'
>     BUILD_BUG_ON(cond);             \
>     ^~~~~~~~~~~~
> mm/huge_memory.c:403:2: note: in expansion of macro 'MAYBE_BUILD_BUG_ON'
>   MAYBE_BUILD_BUG_ON(HPAGE_PMD_ORDER >= MAX_ORDER);
>   ^~~~~~~~~~~~~~~~~~
> make[1]: *** [scripts/Makefile.build:267: mm/huge_memory.o] Error 1
> make[1]: *** Waiting for unfinished jobs....
> make: *** [Makefile:1735: mm] Error 2
> make: *** Waiting for unfinished jobs....
> ------------
> 
> 
> The s390 error is the same on Linus' master and linux-next.  So whatever is
> causing that has slipped into mainline and/or is something I've broken in the
> test scripts.
> 

Compiler version related. gcc version 8.x and later no longer work.
Bisect points to commit a148866489f ("sched: Replace rq::wake_list").
Oddly enough x86 images are broken as well. You'll have to use an
older version of gcc (or presumably clang) until this is fixed.

Guenter