linux-kernel - Re: linux-next: build failure after merge of the access

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Wed, 10 Dec 2014 12:20:35 +0100
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
CC:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: linux-next: build failure after merge of the access_once tree

Am 10.12.2014 um 09:20 schrieb Stephen Rothwell:
> Hi Christian,
> 
> After merging the access_once tree, today's linux-next build (powerpc
> ppc44x_defconfig) failed like this:
> 
> In file included from /scratch/sfr/next/include/uapi/linux/stddef.h:1:0,
>                  from /scratch/sfr/next/include/linux/stddef.h:4,
>                  from /scratch/sfr/next/include/uapi/linux/posix_types.h:4,
>                  from /scratch/sfr/next/include/uapi/linux/types.h:13,
>                  from /scratch/sfr/next/include/linux/types.h:5,
>                  from /scratch/sfr/next/include/linux/smp.h:10,
>                  from /scratch/sfr/next/include/linux/kernel_stat.h:4,
>                  from /scratch/sfr/next/mm/memory.c:41:
> In function '__read_once_size',
>     inlined from 'handle_pte_fault' at /scratch/sfr/next/mm/memory.c:3192:10,
>     inlined from '__handle_mm_fault' at /scratch/sfr/next/mm/memory.c:3324:2,
>     inlined from 'handle_mm_fault' at /scratch/sfr/next/mm/memory.c:3353:6:
> /scratch/sfr/next/include/linux/compiler.h:206:3: warning: call to 'data_access_exceeds_word_size' declared with attribute warning: data access exceeds word size and won't be atomic
>    data_access_exceeds_word_size();
>    ^
> mm/built-in.o: In function `handle_mm_fault':
> (.text+0x283a0): undefined reference to `data_access_exceeds_word_size'
> 
> I hate dropped the access_once tree again today.

hate dropped? typo or bad mood? ;-)

I fixed this two-ways 
1: a real bug: I did not provide data_access_exceeds_word_size
2: a change in semantics: change the memory.c rework to a barrier as if should be enough

Can you retry (I added ppc44x_defconfig to my cross compile test)?

Christian

Sorry for being such a pain, but the access_once rework will be prone to compile errors

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/