Re: [PATCH v4 2/3] mm, page_owner: Add page_owner_stacks file to print out only stacks and their counte

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Hi Oscar,

kernel test robot noticed the following build errors:

[auto build test ERROR on linus/master]
[also build test ERROR on v6.3-rc7]
[cannot apply to akpm-mm/mm-everything next-20230421]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Oscar-Salvador/lib-stackdepot-Add-a-refcount-field-in-stack_record/20230421-181709
base:   linus/master
patch link:    https://lore.kernel.org/r/20230421101415.5734-3-osalvador%40suse.de
patch subject: [PATCH v4 2/3] mm, page_owner: Add page_owner_stacks file to print out only stacks and their counte
config: powerpc-randconfig-r026-20230421 (https://download.01.org/0day-ci/archive/20230422/202304220715.syaqgRUa-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project 437b7602e4a998220871de78afcb020b9c14a661)
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 powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        # https://github.com/intel-lab-lkp/linux/commit/6c6dfc43015e1939f433f4371d33418ab4d03411
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Oscar-Salvador/lib-stackdepot-Add-a-refcount-field-in-stack_record/20230421-181709
        git checkout 6c6dfc43015e1939f433f4371d33418ab4d03411
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=powerpc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/kernel/ kernel/dma/ lib/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202304220715.syaqgRUa-lkp@xxxxxxxxx/

All error/warnings (new ones prefixed by >>):

   In file included from lib/show_mem.c:8:
   In file included from include/linux/mm.h:22:
   In file included from include/linux/page_ext.h:7:
>> include/linux/stackdepot.h:120:26: warning: declaration of 'struct seq_file' will not be visible outside of this function [-Wvisibility]
   void *stack_start(struct seq_file *m, loff_t *ppos);
                            ^
   include/linux/stackdepot.h:121:25: warning: declaration of 'struct seq_file' will not be visible outside of this function [-Wvisibility]
   void *stack_next(struct seq_file *m, void *v, loff_t *ppos);
                           ^
   include/linux/stackdepot.h:122:24: warning: declaration of 'struct seq_file' will not be visible outside of this function [-Wvisibility]
   int stack_print(struct seq_file *m, void *v);
                          ^
   3 warnings generated.
--
   In file included from lib/scatterlist.c:9:
   In file included from include/linux/scatterlist.h:8:
   In file included from include/linux/mm.h:22:
   In file included from include/linux/page_ext.h:7:
>> include/linux/stackdepot.h:120:26: warning: declaration of 'struct seq_file' will not be visible outside of this function [-Wvisibility]
   void *stack_start(struct seq_file *m, loff_t *ppos);
                            ^
   include/linux/stackdepot.h:121:25: warning: declaration of 'struct seq_file' will not be visible outside of this function [-Wvisibility]
   void *stack_next(struct seq_file *m, void *v, loff_t *ppos);
                           ^
   include/linux/stackdepot.h:122:24: warning: declaration of 'struct seq_file' will not be visible outside of this function [-Wvisibility]
   int stack_print(struct seq_file *m, void *v);
                          ^
   In file included from lib/scatterlist.c:9:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/powerpc/include/asm/io.h:640:
   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:637:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:214:1: note: expanded from here
   __do_insb
   ^
   arch/powerpc/include/asm/io.h:577:56: 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 lib/scatterlist.c:9:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/powerpc/include/asm/io.h:640:
   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:637:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:216:1: note: expanded from here
   __do_insw
   ^
   arch/powerpc/include/asm/io.h:578:56: 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 lib/scatterlist.c:9:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/powerpc/include/asm/io.h:640:
   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:637:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:218:1: note: expanded from here
   __do_insl
   ^
   arch/powerpc/include/asm/io.h:579:56: 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 lib/scatterlist.c:9:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/powerpc/include/asm/io.h:640:
   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:637:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:220:1: note: expanded from here
   __do_outsb
   ^
   arch/powerpc/include/asm/io.h:580:58: 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 lib/scatterlist.c:9:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/powerpc/include/asm/io.h:640:
   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:637:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:222:1: note: expanded from here
   __do_outsw
   ^
   arch/powerpc/include/asm/io.h:581:58: 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 lib/scatterlist.c:9:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/powerpc/include/asm/io.h:640:
   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:637:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:224:1: note: expanded from here
   __do_outsl
   ^
   arch/powerpc/include/asm/io.h:582:58: note: expanded from macro '__do_outsl'
   #define __do_outsl(p, b, n)     writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
                                           ~~~~~~~~~~~~~~~~~~~~~^
   9 warnings generated.
--
   In file included from lib/stackdepot.c:20:
   In file included from include/linux/mm.h:22:
   In file included from include/linux/page_ext.h:7:
>> include/linux/stackdepot.h:120:26: warning: declaration of 'struct seq_file' will not be visible outside of this function [-Wvisibility]
   void *stack_start(struct seq_file *m, loff_t *ppos);
                            ^
   include/linux/stackdepot.h:121:25: warning: declaration of 'struct seq_file' will not be visible outside of this function [-Wvisibility]
   void *stack_next(struct seq_file *m, void *v, loff_t *ppos);
                           ^
   include/linux/stackdepot.h:122:24: warning: declaration of 'struct seq_file' will not be visible outside of this function [-Wvisibility]
   int stack_print(struct seq_file *m, void *v);
                          ^
   In file included from lib/stackdepot.c:29:
   In file included from include/linux/memblock.h:13:
   In file included from arch/powerpc/include/asm/dma.h:22:
   In file included from arch/powerpc/include/asm/io.h:640:
   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:637:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:217:1: note: expanded from here
   __do_insb
   ^
   arch/powerpc/include/asm/io.h:577:56: 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 lib/stackdepot.c:29:
   In file included from include/linux/memblock.h:13:
   In file included from arch/powerpc/include/asm/dma.h:22:
   In file included from arch/powerpc/include/asm/io.h:640:
   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:637:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:219:1: note: expanded from here
   __do_insw
   ^
   arch/powerpc/include/asm/io.h:578:56: 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 lib/stackdepot.c:29:
   In file included from include/linux/memblock.h:13:
   In file included from arch/powerpc/include/asm/dma.h:22:
   In file included from arch/powerpc/include/asm/io.h:640:
   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:637:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:221:1: note: expanded from here
   __do_insl
   ^
   arch/powerpc/include/asm/io.h:579:56: 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 lib/stackdepot.c:29:
   In file included from include/linux/memblock.h:13:
   In file included from arch/powerpc/include/asm/dma.h:22:
   In file included from arch/powerpc/include/asm/io.h:640:
   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:637:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:223:1: note: expanded from here
   __do_outsb
   ^
   arch/powerpc/include/asm/io.h:580:58: 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 lib/stackdepot.c:29:
   In file included from include/linux/memblock.h:13:
   In file included from arch/powerpc/include/asm/dma.h:22:
   In file included from arch/powerpc/include/asm/io.h:640:
   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:637:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:225:1: note: expanded from here
   __do_outsw
   ^
   arch/powerpc/include/asm/io.h:581:58: 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 lib/stackdepot.c:29:
   In file included from include/linux/memblock.h:13:
   In file included from arch/powerpc/include/asm/dma.h:22:
   In file included from arch/powerpc/include/asm/io.h:640:
   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:637:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:227:1: note: expanded from here
   __do_outsl
   ^
   arch/powerpc/include/asm/io.h:582:58: note: expanded from macro '__do_outsl'
   #define __do_outsl(p, b, n)     writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
                                           ~~~~~~~~~~~~~~~~~~~~~^
>> lib/stackdepot.c:505:7: error: conflicting types for 'stack_start'
   void *stack_start(struct seq_file *m, loff_t *ppos)
         ^
   include/linux/stackdepot.h:120:7: note: previous declaration is here
   void *stack_start(struct seq_file *m, loff_t *ppos);
         ^
>> lib/stackdepot.c:523:7: error: conflicting types for 'stack_next'
   void *stack_next(struct seq_file *m, void *v, loff_t *ppos)
         ^
   include/linux/stackdepot.h:121:7: note: previous declaration is here
   void *stack_next(struct seq_file *m, void *v, loff_t *ppos);
         ^
>> lib/stackdepot.c:552:5: error: conflicting types for 'stack_print'
   int stack_print(struct seq_file *m, void *v)
       ^
   include/linux/stackdepot.h:122:5: note: previous declaration is here
   int stack_print(struct seq_file *m, void *v);
       ^
   9 warnings and 3 errors generated.
--
   In file included from arch/powerpc/kernel/align.c:17:
   In file included from include/linux/mm.h:22:
   In file included from include/linux/page_ext.h:7:
>> include/linux/stackdepot.h:120:26: error: declaration of 'struct seq_file' will not be visible outside of this function [-Werror,-Wvisibility]
   void *stack_start(struct seq_file *m, loff_t *ppos);
                            ^
   include/linux/stackdepot.h:121:25: error: declaration of 'struct seq_file' will not be visible outside of this function [-Werror,-Wvisibility]
   void *stack_next(struct seq_file *m, void *v, loff_t *ppos);
                           ^
   include/linux/stackdepot.h:122:24: error: declaration of 'struct seq_file' will not be visible outside of this function [-Werror,-Wvisibility]
   int stack_print(struct seq_file *m, void *v);
                          ^
   In file included from arch/powerpc/kernel/align.c:22:
   In file included from arch/powerpc/include/asm/emulated_ops.h:10:
   In file included from include/linux/perf_event.h:52:
   In file included from include/linux/ftrace.h:10:
   In file included from include/linux/trace_recursion.h:5:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from arch/powerpc/include/asm/hardirq.h:6:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/powerpc/include/asm/io.h:640:
   arch/powerpc/include/asm/io-defs.h:43:1: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
   DEF_PCI_AC_NORET(insb, (unsigned long p, void *b, unsigned long c),
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/powerpc/include/asm/io.h:637:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:220:1: note: expanded from here
   __do_insb
   ^
   arch/powerpc/include/asm/io.h:577:56: 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 arch/powerpc/kernel/align.c:22:
   In file included from arch/powerpc/include/asm/emulated_ops.h:10:
   In file included from include/linux/perf_event.h:52:
   In file included from include/linux/ftrace.h:10:
   In file included from include/linux/trace_recursion.h:5:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from arch/powerpc/include/asm/hardirq.h:6:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/powerpc/include/asm/io.h:640:
   arch/powerpc/include/asm/io-defs.h:45:1: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
   DEF_PCI_AC_NORET(insw, (unsigned long p, void *b, unsigned long c),
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/powerpc/include/asm/io.h:637:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:222:1: note: expanded from here
   __do_insw
   ^
   arch/powerpc/include/asm/io.h:578:56: 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 arch/powerpc/kernel/align.c:22:
   In file included from arch/powerpc/include/asm/emulated_ops.h:10:
   In file included from include/linux/perf_event.h:52:
   In file included from include/linux/ftrace.h:10:
   In file included from include/linux/trace_recursion.h:5:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from arch/powerpc/include/asm/hardirq.h:6:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/powerpc/include/asm/io.h:640:
   arch/powerpc/include/asm/io-defs.h:47:1: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
   DEF_PCI_AC_NORET(insl, (unsigned long p, void *b, unsigned long c),
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/powerpc/include/asm/io.h:637:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:224:1: note: expanded from here
   __do_insl
   ^
   arch/powerpc/include/asm/io.h:579:56: 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 arch/powerpc/kernel/align.c:22:
   In file included from arch/powerpc/include/asm/emulated_ops.h:10:
   In file included from include/linux/perf_event.h:52:
   In file included from include/linux/ftrace.h:10:
   In file included from include/linux/trace_recursion.h:5:
   In file included from include/linux/interrupt.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from arch/powerpc/include/asm/hardirq.h:6:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/powerpc/include/asm/io.h:640:
   arch/powerpc/include/asm/io-defs.h:49:1: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
   DEF_PCI_AC_NORET(outsb, (unsigned long p, const void *b, unsigned long c),
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/powerpc/include/asm/io.h:637:3: note: expanded from macro 'DEF_PCI_AC_NORET'
                   __do_##name al;                                 \
                   ^~~~~~~~~~~~~~
   <scratch space>:226:1: note: expanded from here
   __do_outsb
   ^
   arch/powerpc/include/asm/io.h:580:58: note: expanded from macro '__do_outsb'
   #define __do_outsb(p, b, n)     writesb((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
                                           ~~~~~~~~~~~~~~~~~~~~~^


vim +/stack_start +505 lib/stackdepot.c

   503	
   504	#ifdef CONFIG_PAGE_OWNER
 > 505	void *stack_start(struct seq_file *m, loff_t *ppos)
   506	{
   507		unsigned long *table = m->private;
   508		struct stack_record **stacks, *stack;
   509	
   510		/* First time */
   511		if (*ppos == 0)
   512			*table = 0;
   513	
   514		if (*ppos == -1UL)
   515			return NULL;
   516	
   517		stacks = &stack_table[*table];
   518		stack = (struct stack_record *)stacks;
   519	
   520		return stack;
   521	}
   522	
 > 523	void *stack_next(struct seq_file *m, void *v, loff_t *ppos)
   524	{
   525		unsigned long *table = m->private;
   526		unsigned long nr_table = *table;
   527		struct stack_record *next = NULL, *stack = v, **stacks;
   528		unsigned long stack_table_entries = stack_hash_mask + 1;
   529	
   530		if (!stack) {
   531	new_table:
   532			/* New table */
   533			nr_table++;
   534			if (nr_table >= stack_table_entries)
   535				goto out;
   536			stacks = &stack_table[nr_table];
   537			stack = (struct stack_record *)stacks;
   538			next = stack;
   539		} else {
   540			next = stack->next;
   541		}
   542	
   543		if (!next)
   544			goto new_table;
   545	
   546	out:
   547		*table = nr_table;
   548		*ppos = (nr_table >= stack_table_entries) ? -1UL : *ppos + 1;
   549		return next;
   550	}
   551	
 > 552	int stack_print(struct seq_file *m, void *v)
   553	{
   554		char *buf;
   555		int ret = 0;
   556		struct stack_record *stack =v;
   557	
   558		if (!stack->size || stack->size < 0 ||
   559		    stack->size > PAGE_SIZE || stack->handle.valid != 1 ||
   560		    refcount_read(&stack->count) < 1)
   561			return 0;
   562	
   563		buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
   564		ret += stack_trace_snprint(buf, PAGE_SIZE, stack->entries, stack->size, 0);
   565		scnprintf(buf + ret, PAGE_SIZE - ret, "stack count: %d\n\n",
   566			  refcount_read(&stack->count));
   567		seq_printf(m, buf);
   568		seq_puts(m, "\n\n");
   569		kfree(buf);
   570	
   571	        return 0;
   572	}
   573	#endif
   574	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests




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