From: Michal Marek <mmarek@suse.cz>
To: Stephen Rothwell <sfr@canb.auug.org.au>,
Nicholas Piggin <npiggin@gmail.com>
Cc: linux-kernel@vger.kernel.org, linux-next@vger.kernel.org,
Al Viro <viro@zeniv.linux.org.uk>,
PowerPC <linuxppc-dev@lists.ozlabs.org>
Subject: Re: linux-next: build warnings after merge of the kbuild tree
Date: Fri, 19 Aug 2016 10:37:00 +0200 [thread overview]
Message-ID: <5babe9ef-0e3d-6975-9ba4-9a29a700b24d@suse.cz> (raw)
In-Reply-To: <20160819150914.36106b5b@canb.auug.org.au>
On 2016-08-19 07:09, Stephen Rothwell wrote:
> Hi Nick,
>
> On Fri, 19 Aug 2016 13:38:54 +1000 Stephen Rothwell <sfr@canb.auug.org.au> wrote:
>>
>> On Thu, 18 Aug 2016 11:09:48 +1000 Nicholas Piggin <npiggin@gmail.com> wrote:
>>>
>>> On Wed, 17 Aug 2016 14:59:59 +0200
>>> Michal Marek <mmarek@suse.cz> wrote:
>>>
>>>> On 2016-08-17 03:44, Stephen Rothwell wrote:
>>>>>
>>>>> After merging the kbuild tree, today's linux-next build (powerpc
>>>>> ppc64_defconfig) produced these warnings:
>>>>>
>>>>> WARNING: 25 bad relocations
>>>>> c000000000cf2570 R_PPC64_ADDR64 __crc___arch_hweight16
>>>> [...]
>>>>> Introduced by commit
>>>>>
>>>>> 9445aa1a3062 ("ppc: move exports to definitions")
>>>>>
>>>>> I have reverted that commit for today.
>>>>>
>>>>> [cc-ing the ppc guys for clues - also involved is commit
>>>>>
>>>>> 22823ab419d8 ("EXPORT_SYMBOL() for asm")
>>>>> ]
>>>>
>>>> FWIW, I see these warnings as well. Any help from ppc developers is
>>>> appreciated - should the R_PPC64_ADDR64 be whitelisted for exported asm
>>>> symbols (their CRCs actually)?
>>>
>>> The dangling relocation is a side effect of linker unable to resolve the
>>> reference to the undefined weak symbols. So the real question is, why has
>>> genksyms not overridden these symbols with their CRC values?
>>>
>>> This may not even be powerpc specific, but I'll poke at it a bit more
>>> when I get a chance.
>>
>> Not sure if this is relevant, but with the commit reverted, the
>> __crc___... symbols are absolute.
>>
>> 00000000f55b3b3d A __crc___arch_hweight16
>
> Ignore that :-)
>
> I just had a look at a x86_64 allmodconfig result and it looks like the
> weak symbols are not resolved their either ...
>
> I may be missing something, but genksyms generates the crc's off the
> preprocessed C source code and we don't have any for the asm files ...
Of course you are right. Which means that we are losing type information
for these exports for CONFIG_MODVERSIONS purposes. I guess it's
acceptable, since the asm functions are pretty basic and their
signatures do not change.
Michal
next prev parent reply other threads:[~2016-08-19 8:37 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-17 1:44 linux-next: build warnings after merge of the kbuild tree Stephen Rothwell
2016-08-17 12:59 ` Michal Marek
2016-08-18 1:09 ` Nicholas Piggin
2016-08-19 3:38 ` Stephen Rothwell
2016-08-19 5:09 ` Stephen Rothwell
2016-08-19 5:32 ` Nicholas Piggin
2016-08-19 8:37 ` Michal Marek [this message]
2016-08-19 10:44 ` Nicholas Piggin
2016-08-22 10:47 ` Nicholas Piggin
2016-08-26 3:58 ` Nicholas Piggin
2016-08-26 6:21 ` Nicholas Mc Guire
-- strict thread matches above, loose matches on Subject: below --
2022-06-01 23:28 Stephen Rothwell
2019-09-04 0:13 Stephen Rothwell
2019-09-04 1:00 ` Masahiro Yamada
2019-09-04 6:22 ` Masahiro Yamada
2019-09-04 12:33 ` Stephen Rothwell
2019-09-04 12:32 ` Stephen Rothwell
2018-05-30 22:40 Stephen Rothwell
2018-05-31 1:12 ` Masahiro Yamada
2018-05-31 1:26 ` Kees Cook
2018-05-31 3:53 ` Kees Cook
2018-06-01 1:56 ` Masahiro Yamada
2018-06-01 4:01 ` Kees Cook
2018-06-02 20:39 ` Arnd Bergmann
2018-06-04 8:39 ` Arnd Bergmann
2017-07-19 0:05 Stephen Rothwell
2016-06-09 2:22 Stephen Rothwell
2016-06-09 2:56 ` Kees Cook
2016-06-09 4:05 ` Stephen Rothwell
2016-06-09 10:57 ` Michal Marek
2016-06-09 17:37 ` Emese Revfy
2016-06-09 17:58 ` Kees Cook
2016-06-09 11:10 ` Michael Ellerman
2016-06-09 17:42 ` Emese Revfy
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