Re: [kbuild-all] Re: include/linux/build_bug.h:78:41: error: static assertion failed: "offsetof(struct page, mapping) == offsetof(struct folio, mapping)"

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On 2/14/2022 8:05 AM, Wei Yang wrote:
On Sun, Feb 13, 2022 at 07:51:34PM +0800, kernel test robot wrote:
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b81b1829e7e39f6cebdf6e4d5484eacbceda8554
commit: 536f4217ced62b671bd759f6b549621a5654a70f mm: page->mapping folio->mapping should have the same offset
date:   2 weeks ago
config: parisc-randconfig-r004-20220213 (https://download.01.org/0day-ci/archive/20220213/202202131932.diaqTbxo-lkp@xxxxxxxxx/config)
compiler: hppa64-linux-gcc (GCC) 11.2.0
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=536f4217ced62b671bd759f6b549621a5654a70f
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 536f4217ced62b671bd759f6b549621a5654a70f
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=parisc prepare

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

      18 |         if (!(word & (~0ul << 32))) {
         |                            ^~
   include/asm-generic/bitops/__fls.h:20:22: warning: left shift count >= width of type [-Wshift-count-overflow]
      20 |                 word <<= 32;
         |                      ^~~
   include/asm-generic/bitops/__fls.h:23:28: warning: left shift count >= width of type [-Wshift-count-overflow]
      23 |         if (!(word & (~0ul << (BITS_PER_LONG-16)))) {
         |                            ^~
   include/asm-generic/bitops/__fls.h:27:28: warning: left shift count >= width of type [-Wshift-count-overflow]
      27 |         if (!(word & (~0ul << (BITS_PER_LONG-8)))) {
         |                            ^~
   include/asm-generic/bitops/__fls.h:31:28: warning: left shift count >= width of type [-Wshift-count-overflow]
      31 |         if (!(word & (~0ul << (BITS_PER_LONG-4)))) {
         |                            ^~
   include/asm-generic/bitops/__fls.h:35:28: warning: left shift count >= width of type [-Wshift-count-overflow]
      35 |         if (!(word & (~0ul << (BITS_PER_LONG-2)))) {
         |                            ^~
   include/asm-generic/bitops/__fls.h:39:28: warning: left shift count >= width of type [-Wshift-count-overflow]
      39 |         if (!(word & (~0ul << (BITS_PER_LONG-1))))
         |                            ^~
   In file included from arch/parisc/include/asm/bitops.h:201,
                    from include/linux/bitops.h:33,
                    from include/linux/kernel.h:22,
                    from arch/parisc/include/asm/bug.h:5,
                    from include/linux/bug.h:5,
                    from include/linux/thread_info.h:13,
                    from include/asm-generic/preempt.h:5,
                    from ./arch/parisc/include/generated/asm/preempt.h:1,
                    from include/linux/preempt.h:78,
                    from include/linux/rcupdate.h:27,
                    from include/linux/rculist.h:11,
                    from include/linux/pid.h:5,
                    from include/linux/sched.h:14,
                    from arch/parisc/kernel/asm-offsets.c:18:
   include/asm-generic/bitops/__fls.h: In function '__fls':
   include/asm-generic/bitops/__fls.h:18:28: warning: left shift count >= width of type [-Wshift-count-overflow]
      18 |         if (!(word & (~0ul << 32))) {
         |                            ^~
   include/asm-generic/bitops/__fls.h:20:22: warning: left shift count >= width of type [-Wshift-count-overflow]
      20 |                 word <<= 32;
         |                      ^~~
   include/asm-generic/bitops/__fls.h:23:28: warning: left shift count >= width of type [-Wshift-count-overflow]
      23 |         if (!(word & (~0ul << (BITS_PER_LONG-16)))) {
         |                            ^~
   include/asm-generic/bitops/__fls.h:27:28: warning: left shift count >= width of type [-Wshift-count-overflow]
      27 |         if (!(word & (~0ul << (BITS_PER_LONG-8)))) {
         |                            ^~
   include/asm-generic/bitops/__fls.h:31:28: warning: left shift count >= width of type [-Wshift-count-overflow]
      31 |         if (!(word & (~0ul << (BITS_PER_LONG-4)))) {
         |                            ^~
   include/asm-generic/bitops/__fls.h:35:28: warning: left shift count >= width of type [-Wshift-count-overflow]
      35 |         if (!(word & (~0ul << (BITS_PER_LONG-2)))) {
         |                            ^~
   include/asm-generic/bitops/__fls.h:39:28: warning: left shift count >= width of type [-Wshift-count-overflow]
      39 |         if (!(word & (~0ul << (BITS_PER_LONG-1))))
         |                            ^~
   In file included from arch/parisc/include/asm/processor.h:18,
                    from arch/parisc/include/asm/thread_info.h:6,
                    from include/linux/thread_info.h:60,
                    from include/asm-generic/preempt.h:5,
                    from ./arch/parisc/include/generated/asm/preempt.h:1,
                    from include/linux/preempt.h:78,
                    from include/linux/rcupdate.h:27,
                    from include/linux/rculist.h:11,
                    from include/linux/pid.h:5,
                    from include/linux/sched.h:14,
                    from arch/parisc/kernel/asm-offsets.c:18:
   arch/parisc/include/asm/pdc.h: At top level:
   arch/parisc/include/asm/pdc.h:77:24: warning: 'struct pdc_memory_table' declared inside parameter list will not be visible outside of this definition or declaration
      77 |                 struct pdc_memory_table *tbl, unsigned long entries);
         |                        ^~~~~~~~~~~~~~~~
   arch/parisc/include/asm/pdc.h:76:30: warning: 'struct pdc_memory_table_raddr' declared inside parameter list will not be visible outside of this definition or declaration
      76 | int pdc_mem_mem_table(struct pdc_memory_table_raddr *r_addr,
         |                              ^~~~~~~~~~~~~~~~~~~~~~
   In file included from include/linux/compiler_types.h:65,
                    from <command-line>:
   include/linux/smp.h:34:33: error: requested alignment '20' is not a positive power of 2
      34 |         __aligned(sizeof(struct __call_single_data));
         |                                 ^~~~~~~~~~~~~~~~~~
   include/linux/compiler_attributes.h:33:68: note: in definition of macro '__aligned'
      33 | #define __aligned(x)                    __attribute__((__aligned__(x)))
         |                                                                    ^
   In file included from include/linux/container_of.h:5,
                    from include/linux/list.h:5,
                    from include/linux/rculist.h:10,
                    from include/linux/pid.h:5,
                    from include/linux/sched.h:14,
                    from arch/parisc/kernel/asm-offsets.c:18:
   include/linux/build_bug.h:78:41: error: static assertion failed: "offsetof(struct page, lru) == offsetof(struct folio, lru)"
      78 | #define __static_assert(expr, msg, ...) _Static_assert(expr, msg)
         |                                         ^~~~~~~~~~~~~~
   include/linux/build_bug.h:77:34: note: in expansion of macro '__static_assert'
      77 | #define static_assert(expr, ...) __static_assert(expr, ##__VA_ARGS__, #expr)
         |                                  ^~~~~~~~~~~~~~~
   include/linux/mm_types.h:261:9: note: in expansion of macro 'static_assert'
     261 |         static_assert(offsetof(struct page, pg) == offsetof(struct folio, fl))
         |         ^~~~~~~~~~~~~
   include/linux/mm_types.h:263:1: note: in expansion of macro 'FOLIO_MATCH'
     263 | FOLIO_MATCH(lru, lru);

Sounds each FOLIO_MATCH() gets an compile error?

Compile on my machine looks good to me. How this happens?


Hi Wei,

Sorry for the inconvenience, it's a false positive, the problem is
that ARCH=parisc was used to build the 64 bit kernel.

Best Regards,
Rong Chen




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