linux-kernel - Re: nsdeps not working on modules in 5.4-rc1

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Message-ID: <20191003104356.GA77584@google.com>
Date:   Thu, 3 Oct 2019 11:43:56 +0100
From:   Matthias Maennich <maennich@...gle.com>
To:     Steve French <smfrench@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        CIFS <linux-cifs@...r.kernel.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Jessica Yu <jeyu@...nel.org>
Subject: Re: nsdeps not working on modules in 5.4-rc1

Hi Steve!

On Wed, Oct 02, 2019 at 06:54:26PM -0500, Steve French wrote:
>And running the build differently, from the root of the git tree
>(5.4-rc1) rather than using the Ubuntu 5.4-rc1 headers also fails
>
>e.g. "make  M=fs/cifs modules nsdeps"
>
>...
>  LD [M]  fs/cifs/cifs.o
>  Building modules, stage 2.
>  MODPOST 1 modules
>WARNING: module cifs uses symbol sigprocmask from namespace
>_fs/cifs/cache.o), but does not import it.
>...
>WARNING: module cifs uses symbol posix_test_lock from namespace
>cifs/cache.o), but does not import it.
>  CC [M]  fs/cifs/cifs.mod.o
>  LD [M]  fs/cifs/cifs.ko
>  Building modules, stage 2.
>  MODPOST 1 modules
>./scripts/nsdeps: 34: local: ./fs/cifs/cifsfs.c: bad variable name
>make: *** [Makefile:1710: nsdeps] Error 2

Thanks for reporting this. It appears to me you hit a bug that was
recently discovered: when building with `make M=some/subdirectory`,
modpost is misbehaving. Can you try whether this patch series solves
your problems:
https://lore.kernel.org/lkml/20191003075826.7478-1-yamada.masahiro@socionext.com/
In particular patch 2/6 out of the series.

Cheers,
Matthias

>On Wed, Oct 2, 2019 at 6:45 PM Steve French <smfrench@...il.com> wrote:
>>
>> Following the instructions in Documentation/namespaces to autogenerate
>> the namespace changes to avoid the multiple build warnings in 5.4-rc1
>> for my module ... I am not able to get nsdeps to work.   For example
>> in my module directory (fs/cifs) trying to build with nsdeps:
>>
>>       make -C /usr/src/linux-headers-`uname -r` M=`pwd` modules nsdeps
>>
>> gets the error "cat: ./modules.order: No such file or directory"
>>
>> This is on Ubuntu 18, running current 5.4-rc1 kernel.  It looks like
>> it is looking for modules.order in the wrong directory (it is present
>> in fs/cifs - but it looks like it is looking for it in /usr/src where
>> of course it won't be found)
>>
>> I am trying to remove the hundreds of new warnings introduced by
>> namespaces in 5.4-rc1 when building my module e.g.
>>
>> WARNING: module cifs uses symbol __fscache_acquire_cookie from
>> namespace .o: $(deps_/home/sfrench/cifs-2.6/fs/cifs/cache.o), but does
>> not import it.
>> --
>> Thanks,
>>
>> Steve
>
>
>
>-- 
>Thanks,
>
>Steve