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Date:   Sun, 14 Jun 2020 19:05:13 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     kernel test robot <lkp@...el.com>
Cc:     cl@...ux.com, penberg@...nel.org, rientjes@...gle.com,
        iamjoonsoo.kim@....com, Andrew Morton <akpm@...ux-foundation.org>,
        kbuild-all@...ts.01.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [External] Re: [PATCH] mm/slab: Add a __GFP_ACCOUNT GFP flag
 check for slab allocation

On Sun, Jun 14, 2020 at 6:19 PM kernel test robot <lkp@...el.com> wrote:
>
> Hi Muchun,
>
> Thank you for the patch! Perhaps something to improve:
>
> [auto build test WARNING on mmotm/master]
>
> url:    https://github.com/0day-ci/linux/commits/Muchun-Song/mm-slab-Add-a-__GFP_ACCOUNT-GFP-flag-check-for-slab-allocation/20200614-144049
> base:   git://git.cmpxchg.org/linux-mmotm.git master
> config: xtensa-allyesconfig (attached as .config)
> compiler: xtensa-linux-gcc (GCC) 9.3.0
> 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
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=xtensa
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>, old ones prefixed by <<):
>
> In file included from include/linux/kernel.h:11,
> from include/linux/interrupt.h:6,
> from mm/kasan/common.c:18:
> include/linux/scatterlist.h: In function 'sg_set_buf':
> arch/xtensa/include/asm/page.h:182:9: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
> 182 |  ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
> |         ^~
> include/linux/compiler.h:78:42: note: in definition of macro 'unlikely'
> 78 | # define unlikely(x) __builtin_expect(!!(x), 0)
> |                                          ^
> include/linux/scatterlist.h:143:2: note: in expansion of macro 'BUG_ON'
> 143 |  BUG_ON(!virt_addr_valid(buf));
> |  ^~~~~~
> arch/xtensa/include/asm/page.h:190:32: note: in expansion of macro 'pfn_valid'
> 190 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
> |                                ^~~~~~~~~
> include/linux/scatterlist.h:143:10: note: in expansion of macro 'virt_addr_valid'
> 143 |  BUG_ON(!virt_addr_valid(buf));
> |          ^~~~~~~~~~~~~~~
> In file included from include/linux/mm_types_task.h:16,
> from include/linux/mm_types.h:5,
> from include/linux/mmzone.h:21,
> from include/linux/topology.h:33,
> from include/linux/irq.h:19,
> from include/asm-generic/hardirq.h:13,
> from ./arch/xtensa/include/generated/asm/hardirq.h:1,
> from include/linux/hardirq.h:9,
> from include/linux/interrupt.h:11,
> from mm/kasan/common.c:18:
> mm/kasan/../internal.h: In function 'mem_map_next':
> arch/xtensa/include/asm/page.h:182:9: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
> 182 |  ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
> |         ^~
> >> mm/kasan/../internal.h:393:8: note: in expansion of macro 'pfn_valid'
> 393 |   if (!pfn_valid(pfn))
> |        ^~~~~~~~~
> --
> In file included from arch/xtensa/include/asm/processor.h:15,
> from arch/xtensa/include/asm/bitops.h:20,
> from include/linux/bitops.h:19,
> from mm/kasan/report.c:17:
> include/linux/scatterlist.h: In function 'sg_set_buf':
> arch/xtensa/include/asm/page.h:182:9: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
> 182 |  ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
> |         ^~
> include/linux/compiler.h:78:42: note: in definition of macro 'unlikely'
> 78 | # define unlikely(x) __builtin_expect(!!(x), 0)
> |                                          ^
> include/linux/scatterlist.h:143:2: note: in expansion of macro 'BUG_ON'
> 143 |  BUG_ON(!virt_addr_valid(buf));
> |  ^~~~~~
> arch/xtensa/include/asm/page.h:190:32: note: in expansion of macro 'pfn_valid'
> 190 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
> |                                ^~~~~~~~~
> include/linux/scatterlist.h:143:10: note: in expansion of macro 'virt_addr_valid'
> 143 |  BUG_ON(!virt_addr_valid(buf));
> |          ^~~~~~~~~~~~~~~
> In file included from include/linux/mm_types_task.h:16,
> from include/linux/mm_types.h:5,
> from include/linux/mmzone.h:21,
> from include/linux/gfp.h:6,
> from include/linux/mm.h:10,
> from include/linux/kallsyms.h:12,
> from include/linux/ftrace.h:11,
> from mm/kasan/report.c:18:
> mm/kasan/../internal.h: In function 'mem_map_next':
> arch/xtensa/include/asm/page.h:182:9: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
> 182 |  ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
> |         ^~
> >> mm/kasan/../internal.h:393:8: note: in expansion of macro 'pfn_valid'
> 393 |   if (!pfn_valid(pfn))
> |        ^~~~~~~~~
> mm/kasan/report.c: At top level:
> mm/kasan/report.c:474:6: warning: no previous prototype for '__kasan_report' [-Wmissing-prototypes]
> 474 | void __kasan_report(unsigned long addr, size_t size, bool is_write, unsigned long ip)
> |      ^~~~~~~~~~~~~~
> --
> In file included from arch/xtensa/include/asm/processor.h:15,
> from arch/xtensa/include/asm/bitops.h:20,
> from include/linux/bitops.h:19,
> from mm/kasan/generic_report.c:17:
> include/linux/scatterlist.h: In function 'sg_set_buf':
> arch/xtensa/include/asm/page.h:182:9: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
> 182 |  ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
> |         ^~
> include/linux/compiler.h:78:42: note: in definition of macro 'unlikely'
> 78 | # define unlikely(x) __builtin_expect(!!(x), 0)
> |                                          ^
> include/linux/scatterlist.h:143:2: note: in expansion of macro 'BUG_ON'
> 143 |  BUG_ON(!virt_addr_valid(buf));
> |  ^~~~~~
> arch/xtensa/include/asm/page.h:190:32: note: in expansion of macro 'pfn_valid'
> 190 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
> |                                ^~~~~~~~~
> include/linux/scatterlist.h:143:10: note: in expansion of macro 'virt_addr_valid'
> 143 |  BUG_ON(!virt_addr_valid(buf));
> |          ^~~~~~~~~~~~~~~
> In file included from include/linux/mm_types_task.h:16,
> from include/linux/mm_types.h:5,
> from include/linux/mmzone.h:21,
> from include/linux/gfp.h:6,
> from include/linux/mm.h:10,
> from include/linux/kallsyms.h:12,
> from include/linux/ftrace.h:11,
> from mm/kasan/generic_report.c:18:
> mm/kasan/../internal.h: In function 'mem_map_next':
> arch/xtensa/include/asm/page.h:182:9: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits]
> 182 |  ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
> |         ^~
> >> mm/kasan/../internal.h:393:8: note: in expansion of macro 'pfn_valid'
> 393 |   if (!pfn_valid(pfn))
> |        ^~~~~~~~~
> mm/kasan/generic_report.c: At top level:
> mm/kasan/generic_report.c:116:6: warning: no previous prototype for '__asan_report_load1_noabort' [-Wmissing-prototypes]
> 116 | void __asan_report_load##size##_noabort(unsigned long addr)          |      ^~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:129:1: note: in expansion of macro 'DEFINE_ASAN_REPORT_LOAD'
> 129 | DEFINE_ASAN_REPORT_LOAD(1);
> | ^~~~~~~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:116:6: warning: no previous prototype for '__asan_report_load2_noabort' [-Wmissing-prototypes]
> 116 | void __asan_report_load##size##_noabort(unsigned long addr)          |      ^~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:130:1: note: in expansion of macro 'DEFINE_ASAN_REPORT_LOAD'
> 130 | DEFINE_ASAN_REPORT_LOAD(2);
> | ^~~~~~~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:116:6: warning: no previous prototype for '__asan_report_load4_noabort' [-Wmissing-prototypes]
> 116 | void __asan_report_load##size##_noabort(unsigned long addr)          |      ^~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:131:1: note: in expansion of macro 'DEFINE_ASAN_REPORT_LOAD'
> 131 | DEFINE_ASAN_REPORT_LOAD(4);
> | ^~~~~~~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:116:6: warning: no previous prototype for '__asan_report_load8_noabort' [-Wmissing-prototypes]
> 116 | void __asan_report_load##size##_noabort(unsigned long addr)          |      ^~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:132:1: note: in expansion of macro 'DEFINE_ASAN_REPORT_LOAD'
> 132 | DEFINE_ASAN_REPORT_LOAD(8);
> | ^~~~~~~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:116:6: warning: no previous prototype for '__asan_report_load16_noabort' [-Wmissing-prototypes]
> 116 | void __asan_report_load##size##_noabort(unsigned long addr)          |      ^~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:133:1: note: in expansion of macro 'DEFINE_ASAN_REPORT_LOAD'
> 133 | DEFINE_ASAN_REPORT_LOAD(16);
> | ^~~~~~~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:123:6: warning: no previous prototype for '__asan_report_store1_noabort' [-Wmissing-prototypes]
> 123 | void __asan_report_store##size##_noabort(unsigned long addr)          |      ^~~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:134:1: note: in expansion of macro 'DEFINE_ASAN_REPORT_STORE'
> 134 | DEFINE_ASAN_REPORT_STORE(1);
> | ^~~~~~~~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:123:6: warning: no previous prototype for '__asan_report_store2_noabort' [-Wmissing-prototypes]
> 123 | void __asan_report_store##size##_noabort(unsigned long addr)          |      ^~~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:135:1: note: in expansion of macro 'DEFINE_ASAN_REPORT_STORE'
> 135 | DEFINE_ASAN_REPORT_STORE(2);
> | ^~~~~~~~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:123:6: warning: no previous prototype for '__asan_report_store4_noabort' [-Wmissing-prototypes]
> 123 | void __asan_report_store##size##_noabort(unsigned long addr)          |      ^~~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:136:1: note: in expansion of macro 'DEFINE_ASAN_REPORT_STORE'
> 136 | DEFINE_ASAN_REPORT_STORE(4);
> | ^~~~~~~~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:123:6: warning: no previous prototype for '__asan_report_store8_noabort' [-Wmissing-prototypes]
> 123 | void __asan_report_store##size##_noabort(unsigned long addr)          |      ^~~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:137:1: note: in expansion of macro 'DEFINE_ASAN_REPORT_STORE'
> 137 | DEFINE_ASAN_REPORT_STORE(8);
> | ^~~~~~~~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:123:6: warning: no previous prototype for '__asan_report_store16_noabort' [-Wmissing-prototypes]
> 123 | void __asan_report_store##size##_noabort(unsigned long addr)          |      ^~~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:138:1: note: in expansion of macro 'DEFINE_ASAN_REPORT_STORE'
> 138 | DEFINE_ASAN_REPORT_STORE(16);
> | ^~~~~~~~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:140:6: warning: no previous prototype for '__asan_report_load_n_noabort' [-Wmissing-prototypes]
> 140 | void __asan_report_load_n_noabort(unsigned long addr, size_t size)
> |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
> mm/kasan/generic_report.c:146:6: warning: no previous prototype for '__asan_report_store_n_noabort' [-Wmissing-prototypes]
> 146 | void __asan_report_store_n_noabort(unsigned long addr, size_t size)
> |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> vim +/pfn_valid +393 mm/kasan/../internal.h
>
> 69d177c2fc702d Andy Whitcroft  2008-11-06  383
> 69d177c2fc702d Andy Whitcroft  2008-11-06  384  /*
> 25985edcedea63 Lucas De Marchi 2011-03-30  385   * Iterator over all subpages within the maximally aligned gigantic
> 69d177c2fc702d Andy Whitcroft  2008-11-06  386   * page 'base'.  Handle any discontiguity in the mem_map.
> 69d177c2fc702d Andy Whitcroft  2008-11-06  387   */
> 69d177c2fc702d Andy Whitcroft  2008-11-06  388  static inline struct page *mem_map_next(struct page *iter,
> 69d177c2fc702d Andy Whitcroft  2008-11-06  389                                                  struct page *base, int offset)
> 69d177c2fc702d Andy Whitcroft  2008-11-06  390  {
> 69d177c2fc702d Andy Whitcroft  2008-11-06  391          if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) {
> 69d177c2fc702d Andy Whitcroft  2008-11-06  392                  unsigned long pfn = page_to_pfn(base) + offset;
> 69d177c2fc702d Andy Whitcroft  2008-11-06 @393                  if (!pfn_valid(pfn))
> 69d177c2fc702d Andy Whitcroft  2008-11-06  394                          return NULL;
> 69d177c2fc702d Andy Whitcroft  2008-11-06  395                  return pfn_to_page(pfn);
> 69d177c2fc702d Andy Whitcroft  2008-11-06  396          }
> 69d177c2fc702d Andy Whitcroft  2008-11-06  397          return iter + 1;
> 69d177c2fc702d Andy Whitcroft  2008-11-06  398  }
> 69d177c2fc702d Andy Whitcroft  2008-11-06  399
>
> :::::: The code at line 393 was first introduced by commit
> :::::: 69d177c2fc702d402b17fdca2190d5a7e3ca55c5 hugetlbfs: handle pages higher order than MAX_ORDER
>
> :::::: TO: Andy Whitcroft <apw@...dowen.org>
> :::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

Sorry, I can't figure out where the problem is. It doesn't seem to be a problem
caused by my patch.

-- 
Yours,
Muchun

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