linux-kernel - Re: [rcu:rcu/test 76/76] drivers/dax/super.c:21:1: error: use of undeclared identifier '___srcu_struct

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Message-ID: <20201027015334.GA842991@ubuntu-m3-large-x86>
Date:   Mon, 26 Oct 2020 18:53:34 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
        linux-kernel@...r.kernel.org, kernel test robot <lkp@...el.com>
Subject: Re: [rcu:rcu/test 76/76] drivers/dax/super.c:21:1: error: use of
 undeclared identifier '___srcu_struct_ptrs'

Hi Paul,

On Tue, Oct 27, 2020 at 08:50:52AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/test
> head:   784a6343c3660446ae62db13628b20e9f876100f
> commit: 784a6343c3660446ae62db13628b20e9f876100f [76/76] Merge commit '3650b22' into rcu/test
> config: arm-randconfig-r026-20201026 (attached as .config)
> compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project f2c25c70791de95d2466e09b5b58fc37f6ccd7a4)
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # install arm cross compiling tool for clang build
>         # apt-get install binutils-arm-linux-gnueabi
>         # https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/commit/?id=784a6343c3660446ae62db13628b20e9f876100f
>         git remote add rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
>         git fetch --no-tags rcu rcu/test
>         git checkout 784a6343c3660446ae62db13628b20e9f876100f
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All errors (new ones prefixed by >>):
> 
> >> drivers/dax/super.c:21:1: error: use of undeclared identifier '___srcu_struct_ptrs'
>    DEFINE_STATIC_SRCU(dax_srcu);
>    ^
>    include/linux/srcutree.h:135:34: note: expanded from macro 'DEFINE_STATIC_SRCU'
>    #define DEFINE_STATIC_SRCU(name)        __DEFINE_SRCU(name, static)
>                                            ^
>    include/linux/srcutree.h:127:13: note: expanded from macro '__DEFINE_SRCU'
>                    __section(___srcu_struct_ptrs) = &name
>                              ^
>    drivers/dax/super.c:70:6: warning: no previous prototype for function '__generic_fsdax_supported' [-Wmissing-prototypes]
>    bool __generic_fsdax_supported(struct dax_device *dax_dev,
>         ^
>    drivers/dax/super.c:70:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
>    bool __generic_fsdax_supported(struct dax_device *dax_dev,
>    ^
>    static 
>    drivers/dax/super.c:168:6: warning: no previous prototype for function '__bdev_dax_supported' [-Wmissing-prototypes]
>    bool __bdev_dax_supported(struct block_device *bdev, int blocksize)
>         ^
>    drivers/dax/super.c:168:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
>    bool __bdev_dax_supported(struct block_device *bdev, int blocksize)
>    ^
>    static 
>    drivers/dax/super.c:452:6: warning: no previous prototype for function 'run_dax' [-Wmissing-prototypes]
>    void run_dax(struct dax_device *dax_dev)
>         ^
>    drivers/dax/super.c:452:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
>    void run_dax(struct dax_device *dax_dev)
>    ^
>    static 
>    3 warnings and 1 error generated.

Please drop commit c1370c128cf4 ("srcu: Avoid escaped section names"),
it has been fixed in a different way as of v5.10-rc1, in
commit 33def8498fdd ("treewide: Convert macro and uses of __section(foo)
to __section("foo")").

Cheers,
Nathan