linux-kernel - [jlayton:netfs-linked-list 26/54] include/linux/page-flags.h:788:27: error: passing argument 1 of 'dump_page' discards 'const' qualifier from pointer target type

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Date:   Wed, 29 Jun 2022 06:28:19 +0800
From:   kernel test robot <lkp@...el.com>
To:     David Howells <dhowells@...hat.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Jeff Layton <jlayton@...nel.org>
Subject: [jlayton:netfs-linked-list 26/54] include/linux/page-flags.h:788:27:
 error: passing argument 1 of 'dump_page' discards 'const' qualifier from
 pointer target type

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git netfs-linked-list
head:   d35a2461e039c9131e97bb125eac59a0f04e9161
commit: 06b03c53376206f3b98cc4dbb1f061a10085309b [26/54] mm: Make some folio function arguments const
config: i386-allyesconfig (https://download.01.org/0day-ci/archive/20220629/202206290625.KP0q3MpI-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git/commit/?id=06b03c53376206f3b98cc4dbb1f061a10085309b
        git remote add jlayton https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git
        git fetch --no-tags jlayton netfs-linked-list
        git checkout 06b03c53376206f3b98cc4dbb1f061a10085309b
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash lib/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

All errors (new ones prefixed by >>):

   In file included from include/linux/gfp.h:5,
                    from include/linux/umh.h:4,
                    from include/linux/kmod.h:9,
                    from include/linux/module.h:17,
                    from lib/test_bitops.c:9:
   include/linux/page-flags.h: In function 'PageHead':
>> include/linux/page-flags.h:788:27: error: passing argument 1 of 'dump_page' discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]
     788 |         PF_POISONED_CHECK(page);
         |                           ^~~~
   include/linux/mmdebug.h:21:35: note: in definition of macro 'VM_BUG_ON_PAGE'
      21 |                         dump_page(page, "VM_BUG_ON_PAGE(" __stringify(cond)")");\
         |                                   ^~~~
   include/linux/page-flags.h:370:17: note: in expansion of macro 'VM_BUG_ON_PGFLAGS'
     370 |                 VM_BUG_ON_PGFLAGS(PagePoisoned(page), page);            \
         |                 ^~~~~~~~~~~~~~~~~
   include/linux/page-flags.h:788:9: note: in expansion of macro 'PF_POISONED_CHECK'
     788 |         PF_POISONED_CHECK(page);
         |         ^~~~~~~~~~~~~~~~~
   include/linux/mmdebug.h:12:29: note: expected 'struct page *' but argument is of type 'const struct page *'
      12 | void dump_page(struct page *page, const char *reason);
         |                ~~~~~~~~~~~~~^~~~
   cc1: all warnings being treated as errors


vim +788 include/linux/page-flags.h

e7d324850bfcb3 Muchun Song   2022-03-22  785  
06b03c53376206 David Howells 2022-06-08  786  static __always_inline int PageHead(const struct page *page)
e7d324850bfcb3 Muchun Song   2022-03-22  787  {
e7d324850bfcb3 Muchun Song   2022-03-22 @788  	PF_POISONED_CHECK(page);
e7d324850bfcb3 Muchun Song   2022-03-22  789  	return test_bit(PG_head, &page->flags) && !page_is_fake_head(page);
e7d324850bfcb3 Muchun Song   2022-03-22  790  }
e7d324850bfcb3 Muchun Song   2022-03-22  791  

:::::: The code at line 788 was first introduced by commit
:::::: e7d324850bfcb30df563d144c0363cc44595277d mm: hugetlb: free the 2nd vmemmap page associated with each HugeTLB page

:::::: TO: Muchun Song <songmuchun@...edance.com>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

-- 
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