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 <[email protected]>
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]
int ceph_con_v2_try_read(struct ceph_connection *con)
^
14 warnings generated.
vim +/ceph_con_v2_try_read +2808 net/ceph/messenger_v2.c
2807
> 2808 int ceph_con_v2_try_read(struct ceph_connection *con)
2809 {
2810 int ret;
2811
2812 dout("%s con %p state %d need %zu\n", __func__, con, con->state,
2813 iov_iter_count(&con->v2.in_iter));
2814
2815 if (con->state == CEPH_CON_S_PREOPEN)
2816 return 0;
2817
2818 /*
2819 * We should always have something pending here. If not,
2820 * avoid calling populate_in_iter() as if we read something
2821 * (ceph_tcp_recv() would immediately return 1).
2822 */
2823 if (WARN_ON(!iov_iter_count(&con->v2.in_iter)))
2824 return -ENODATA;
2825
2826 for (;;) {
2827 ret = ceph_tcp_recv(con);
2828 if (ret <= 0)
2829 return ret;
2830
2831 ret = populate_in_iter(con);
2832 if (ret <= 0) {
2833 if (ret && ret != -EAGAIN && !con->error_msg)
2834 con->error_msg = "read processing error";
2835 return ret;
2836 }
2837 }
2838 }
2839
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/[email protected]
On Mon, Jun 28, 2021 at 3:25 AM kernel test robot <[email protected]> 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 <[email protected]>
>
> 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.
Thanks,
Ilya
On 6/28/2021 4:02 PM, Ilya Dryomov wrote:
> On Mon, Jun 28, 2021 at 3:25 AM kernel test robot <[email protected]> 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 <[email protected]>
>>
>> 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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>
...
> >> arch/powerpc/include/asm/io-defs.h:43:1: warning: performing pointer arithmetic on a null
> pointer has undefined behavior [-Wnull-pointer-arithmetic]
I've just realised why that error is output.
The result of (long)((char *)0 + 4) is only 4 if the NULL pointer
has the 'all-zero' bit pattern.
This isn't mandated by the language.
However I suspect almost every implementation of C there has ever
been has used the all-zero bit pattern for NULL.
This includes one system I used (many years ago) where the 'natural'
NULL pointer would have been the all-ones pattern.
Far too much code assumes memset(ptr, 0, len) will set pointers
to NULL for any other value to ever work.
Of course 'undefined behaviour' doesn't mean 'undefined value'
it includes firing a ICBM at the coder's house.
David
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