[willy-pagecache:for-next 49/75] mm/folio-compat.c:181:9: error: implicit declaration of function 'munlock_vma_folio'

[kernel test robot]

tree:   git://git.infradead.org/users/willy/pagecache for-next
head:   b1ccdc7664f5af97629b33fedf382af350edecf4
commit: 9ba2488442f0e6e010a0d5c9d34fc385a19c8db5 [49/75] mm/mlock: Turn munlock_vma_page() into munlock_vma_folio()
config: riscv-allnoconfig (https://download.01.org/0day-ci/archive/20220207/202202070124.y4SKcrhy-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 6daaf5a44925592c764c59219b0024ee06317028)
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 riscv cross compiling tool for clang build
        # apt-get install binutils-riscv64-linux-gnu
        git remote add willy-pagecache git://git.infradead.org/users/willy/pagecache
        git fetch --no-tags willy-pagecache for-next
        git checkout 9ba2488442f0e6e010a0d5c9d34fc385a19c8db5
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash

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

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

   In file included from mm/folio-compat.c:7:
   In file included from include/linux/migrate.h:6:
   In file included from include/linux/mempolicy.h:15:
   In file included from include/linux/pagemap.h:11:
   In file included from include/linux/highmem.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:136:
   include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __raw_readb(PCI_IOBASE + addr);
                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
                                                     ^
   In file included from mm/folio-compat.c:7:
   In file included from include/linux/migrate.h:6:
   In file included from include/linux/mempolicy.h:15:
   In file included from include/linux/pagemap.h:11:
   In file included from include/linux/highmem.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:136:
   include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/little_endian.h:35:51: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) ((__force __u32)(__le32)(x))
                                                     ^
   In file included from mm/folio-compat.c:7:
   In file included from include/linux/migrate.h:6:
   In file included from include/linux/mempolicy.h:15:
   In file included from include/linux/pagemap.h:11:
   In file included from include/linux/highmem.h:11:
   In file included from include/linux/hardirq.h:11:
   In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:13:
   In file included from arch/riscv/include/asm/io.h:136:
   include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writeb(value, PCI_IOBASE + addr);
                               ~~~~~~~~~~ ^
   include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:1024:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
                                                     ~~~~~~~~~~ ^
   mm/folio-compat.c:169:6: warning: no previous prototype for function 'clear_page_mlock' [-Wmissing-prototypes]
   void clear_page_mlock(struct page *page)
        ^
   mm/folio-compat.c:169:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void clear_page_mlock(struct page *page)
   ^
   static 
   mm/folio-compat.c:174:6: error: redefinition of 'mlock_vma_page'
   void mlock_vma_page(struct page *page)
        ^
   mm/internal.h:500:20: note: previous definition is here
   static inline void mlock_vma_page(struct page *page) { }
                      ^
   mm/folio-compat.c:176:2: error: implicit declaration of function 'mlock_vma_folio' [-Werror,-Wimplicit-function-declaration]
           mlock_vma_folio(page_folio(page));
           ^
   mm/folio-compat.c:176:2: note: did you mean 'mlock_vma_page'?
   mm/folio-compat.c:174:6: note: 'mlock_vma_page' declared here
   void mlock_vma_page(struct page *page)
        ^
>> mm/folio-compat.c:181:9: error: implicit declaration of function 'munlock_vma_folio' [-Werror,-Wimplicit-function-declaration]
           return munlock_vma_folio(page_folio(page));
                  ^
   mm/folio-compat.c:181:9: note: did you mean 'munlock_vma_page'?
   mm/folio-compat.c:179:15: note: 'munlock_vma_page' declared here
   unsigned long munlock_vma_page(struct page *page)
                 ^
>> mm/folio-compat.c:179:15: warning: no previous prototype for function 'munlock_vma_page' [-Wmissing-prototypes]
   unsigned long munlock_vma_page(struct page *page)
                 ^
   mm/folio-compat.c:179:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   unsigned long munlock_vma_page(struct page *page)
   ^
   static 
   mm/folio-compat.c:186:2: error: implicit declaration of function 'folio_mlock' [-Werror,-Wimplicit-function-declaration]
           folio_mlock(page_folio(page));
           ^
   mm/folio-compat.c:186:2: note: did you mean 'folio_lock'?
   include/linux/pagemap.h:776:20: note: 'folio_lock' declared here
   static inline void folio_lock(struct folio *folio)
                      ^
   mm/folio-compat.c:184:6: warning: no previous prototype for function 'page_mlock' [-Wmissing-prototypes]
   void page_mlock(struct page *page)
        ^
   mm/folio-compat.c:184:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void page_mlock(struct page *page)
   ^
   static 
   10 warnings and 4 errors generated.


vim +/munlock_vma_folio +181 mm/folio-compat.c

   173	
   174	void mlock_vma_page(struct page *page)
   175	{
 > 176		mlock_vma_folio(page_folio(page));
   177	}
   178	
 > 179	unsigned long munlock_vma_page(struct page *page)
   180	{
 > 181		return munlock_vma_folio(page_folio(page));
   182	}
   183	

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