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Subject: Re: [kbuild-all] Re: net/ceph/messenger_v2.c:2808:5: warning: stack
 frame size (2336) exceeds limit (2048) in function 'ceph_con_v2_try_read'
To:     Ilya Dryomov <idryomov@gmail.com>,
        kernel test robot <lkp@intel.com>
Cc:     kbuild-all@lists.01.org, clang-built-linux@googlegroups.com,
        LKML <linux-kernel@vger.kernel.org>
References: <202106280955.VUsBSyHq-lkp@intel.com>
 <CAOi1vP-FR2PpqdW4WuhJaaFPZifxthf0B45dV03v00ef66R8wg@mail.gmail.com>
From:   "Chen, Rong A" <rong.a.chen@intel.com>
Message-ID: <a875976b-3117-f001-606b-8e90802bef8a@intel.com>
Date:   Mon, 28 Jun 2021 16:05:48 +0800
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On 6/28/2021 4:02 PM, Ilya Dryomov wrote:
> On Mon, Jun 28, 2021 at 3:25 AM kernel test robot <lkp@intel.com> wrote:
>>
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   62fb9874f5da54fdb243003b386128037319b219
>> commit: cd1a677cad994021b19665ed476aea63f5d54f31 libceph, ceph: implement msgr2.1 protocol (crc and secure modes)
>> date:   7 months ago
>> config: powerpc64-randconfig-r034-20210628 (attached as .config)
>> compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 59558129276098d62046c8cda92240d292cbfb1c)
>> 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 powerpc64 cross compiling tool for clang build
>>          # apt-get install binutils-powerpc64-linux-gnu
>>          # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cd1a677cad994021b19665ed476aea63f5d54f31
>>          git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>          git fetch --no-tags linus master
>>          git checkout cd1a677cad994021b19665ed476aea63f5d54f31
>>          # save the attached .config to linux build tree
>>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64
>>
>> If you fix the issue, kindly add following tag as appropriate
>> Reported-by: kernel test robot <lkp@intel.com>
>>
>> All warnings (new ones prefixed by >>):
>>
>>     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>     arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET'
>>                     __do_##name al;                                 \
>>                     ^~~~~~~~~~~~~~
>>     <scratch space>:2:1: note: expanded from here
>>     __do_outl
>>     ^
>>     arch/powerpc/include/asm/io.h:522:62: note: expanded from macro '__do_outl'
>>     #define __do_outl(val, port)    writel(val,(PCI_IO_ADDR)_IO_BASE+port);
>>                                                ~~~~~~~~~~~~~~~~~~~~~^
>>     In file included from net/ceph/messenger_v2.c:17:
>>     In file included from include/linux/scatterlist.h:9:
>>     In file included from arch/powerpc/include/asm/io.h:604:
>>     arch/powerpc/include/asm/io-defs.h:43:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
>>     DEF_PCI_AC_NORET(insb, (unsigned long p, void *b, unsigned long c),
>>     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>     arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET'
>>                     __do_##name al;                                 \
>>                     ^~~~~~~~~~~~~~
>>     <scratch space>:30:1: note: expanded from here
>>     __do_insb
>>     ^
>>     arch/powerpc/include/asm/io.h:541:56: note: expanded from macro '__do_insb'
>>     #define __do_insb(p, b, n)      readsb((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
>>                                            ~~~~~~~~~~~~~~~~~~~~~^
>>     In file included from net/ceph/messenger_v2.c:17:
>>     In file included from include/linux/scatterlist.h:9:
>>     In file included from arch/powerpc/include/asm/io.h:604:
>>     arch/powerpc/include/asm/io-defs.h:45:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
>>     DEF_PCI_AC_NORET(insw, (unsigned long p, void *b, unsigned long c),
>>     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>     arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET'
>>                     __do_##name al;                                 \
>>                     ^~~~~~~~~~~~~~
>>     <scratch space>:34:1: note: expanded from here
>>     __do_insw
>>     ^
>>     arch/powerpc/include/asm/io.h:542:56: note: expanded from macro '__do_insw'
>>     #define __do_insw(p, b, n)      readsw((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
>>                                            ~~~~~~~~~~~~~~~~~~~~~^
>>     In file included from net/ceph/messenger_v2.c:17:
>>     In file included from include/linux/scatterlist.h:9:
>>     In file included from arch/powerpc/include/asm/io.h:604:
>>     arch/powerpc/include/asm/io-defs.h:47:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
>>     DEF_PCI_AC_NORET(insl, (unsigned long p, void *b, unsigned long c),
>>     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>     arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET'
>>                     __do_##name al;                                 \
>>                     ^~~~~~~~~~~~~~
>>     <scratch space>:38:1: note: expanded from here
>>     __do_insl
>>     ^
>>     arch/powerpc/include/asm/io.h:543:56: note: expanded from macro '__do_insl'
>>     #define __do_insl(p, b, n)      readsl((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
>>                                            ~~~~~~~~~~~~~~~~~~~~~^
>>     In file included from net/ceph/messenger_v2.c:17:
>>     In file included from include/linux/scatterlist.h:9:
>>     In file included from arch/powerpc/include/asm/io.h:604:
>>     arch/powerpc/include/asm/io-defs.h:49:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
>>     DEF_PCI_AC_NORET(outsb, (unsigned long p, const void *b, unsigned long c),
>>     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>     arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET'
>>                     __do_##name al;                                 \
>>                     ^~~~~~~~~~~~~~
>>     <scratch space>:42:1: note: expanded from here
>>     __do_outsb
>>     ^
>>     arch/powerpc/include/asm/io.h:544:58: note: expanded from macro '__do_outsb'
>>     #define __do_outsb(p, b, n)     writesb((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
>>                                             ~~~~~~~~~~~~~~~~~~~~~^
>>     In file included from net/ceph/messenger_v2.c:17:
>>     In file included from include/linux/scatterlist.h:9:
>>     In file included from arch/powerpc/include/asm/io.h:604:
>>     arch/powerpc/include/asm/io-defs.h:51:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
>>     DEF_PCI_AC_NORET(outsw, (unsigned long p, const void *b, unsigned long c),
>>     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>     arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET'
>>                     __do_##name al;                                 \
>>                     ^~~~~~~~~~~~~~
>>     <scratch space>:46:1: note: expanded from here
>>     __do_outsw
>>     ^
>>     arch/powerpc/include/asm/io.h:545:58: note: expanded from macro '__do_outsw'
>>     #define __do_outsw(p, b, n)     writesw((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
>>                                             ~~~~~~~~~~~~~~~~~~~~~^
>>     In file included from net/ceph/messenger_v2.c:17:
>>     In file included from include/linux/scatterlist.h:9:
>>     In file included from arch/powerpc/include/asm/io.h:604:
>>     arch/powerpc/include/asm/io-defs.h:53:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
>>     DEF_PCI_AC_NORET(outsl, (unsigned long p, const void *b, unsigned long c),
>>     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>     arch/powerpc/include/asm/io.h:601:3: note: expanded from macro 'DEF_PCI_AC_NORET'
>>                     __do_##name al;                                 \
>>                     ^~~~~~~~~~~~~~
>>     <scratch space>:50:1: note: expanded from here
>>     __do_outsl
>>     ^
>>     arch/powerpc/include/asm/io.h:546:58: note: expanded from macro '__do_outsl'
>>     #define __do_outsl(p, b, n)     writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
>>                                             ~~~~~~~~~~~~~~~~~~~~~^
>>>> net/ceph/messenger_v2.c:2808:5: warning: stack frame size (2336) exceeds limit (2048) in function 'ceph_con_v2_try_read' [-Wframe-larger-than]
> 
> Same as for ceph_con_v1_try_read(), please add this instance to the
> allowlist.

Got it, thanks for the information.

Best Regards,
Rong Chen

> 
> Thanks,
> 
>                  Ilya
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