linux-kernel - [ammarfaizi2-block:herbert/cryptodev-2.6/master 137/137] include/linux/cacheflush.h:12:46: warning: 'struct folio' declared inside parameter list will not be visible outside of this definition or declaration

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Date:   Mon, 14 Mar 2022 15:25:38 +0800
From:   kernel test robot <lkp@...el.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     kbuild-all@...ts.01.org,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        linux-kernel@...r.kernel.org
Subject: [ammarfaizi2-block:herbert/cryptodev-2.6/master 137/137]
 include/linux/cacheflush.h:12:46: warning: 'struct folio' declared inside
 parameter list will not be visible outside of this definition or declaration

tree:   https://github.com/ammarfaizi2/linux-block herbert/cryptodev-2.6/master
head:   0e03b8fd29363f2df44e2a7a176d486de550757a
commit: 0e03b8fd29363f2df44e2a7a176d486de550757a [137/137] crypto: xilinx - Turn SHA into a tristate and allow COMPILE_TEST
config: h8300-allmodconfig (https://download.01.org/0day-ci/archive/20220314/202203141545.snRTl9jH-lkp@intel.com/config)
compiler: h8300-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://github.com/ammarfaizi2/linux-block/commit/0e03b8fd29363f2df44e2a7a176d486de550757a
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block herbert/cryptodev-2.6/master
        git checkout 0e03b8fd29363f2df44e2a7a176d486de550757a
        # 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=h8300 SHELL=/bin/bash drivers/crypto/xilinx/

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 >>):

   In file included from drivers/crypto/xilinx/zynqmp-sha.c:6:
>> include/linux/cacheflush.h:12:46: warning: 'struct folio' declared inside parameter list will not be visible outside of this definition or declaration
      12 | static inline void flush_dcache_folio(struct folio *folio)
         |                                              ^~~~~
   In file included from include/asm-generic/percpu.h:5,
                    from ./arch/h8300/include/generated/asm/percpu.h:1,
                    from include/linux/irqflags.h:17,
                    from include/asm-generic/cmpxchg.h:15,
                    from ./arch/h8300/include/generated/asm/cmpxchg.h:1,
                    from include/asm-generic/atomic.h:12,
                    from ./arch/h8300/include/generated/asm/atomic.h:1,
                    from include/linux/atomic.h:7,
                    from include/linux/crypto.h:15,
                    from include/crypto/hash.h:11,
                    from drivers/crypto/xilinx/zynqmp-sha.c:7:
   include/linux/scatterlist.h: In function 'sg_set_buf':
   include/asm-generic/page.h:89:51: warning: ordered comparison of pointer with null pointer [-Wextra]
      89 | #define virt_addr_valid(kaddr)  (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
         |                                                   ^~
   include/linux/compiler.h:78:45: note: in definition of macro 'unlikely'
      78 | # define unlikely(x)    __builtin_expect(!!(x), 0)
         |                                             ^
   include/linux/scatterlist.h:160:9: note: in expansion of macro 'BUG_ON'
     160 |         BUG_ON(!virt_addr_valid(buf));
         |         ^~~~~~
   include/linux/scatterlist.h:160:17: note: in expansion of macro 'virt_addr_valid'
     160 |         BUG_ON(!virt_addr_valid(buf));
         |                 ^~~~~~~~~~~~~~~


vim +12 include/linux/cacheflush.h

522a0032af0055 Matthew Wilcox (Oracle  2021-11-06   6) 
522a0032af0055 Matthew Wilcox (Oracle  2021-11-06   7) #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
522a0032af0055 Matthew Wilcox (Oracle  2021-11-06   8) #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_FOLIO
522a0032af0055 Matthew Wilcox (Oracle  2021-11-06   9) void flush_dcache_folio(struct folio *folio);
522a0032af0055 Matthew Wilcox (Oracle  2021-11-06  10) #endif
522a0032af0055 Matthew Wilcox (Oracle  2021-11-06  11) #else
522a0032af0055 Matthew Wilcox (Oracle  2021-11-06 @12) static inline void flush_dcache_folio(struct folio *folio)
522a0032af0055 Matthew Wilcox (Oracle  2021-11-06  13) {
522a0032af0055 Matthew Wilcox (Oracle  2021-11-06  14) }
522a0032af0055 Matthew Wilcox (Oracle  2021-11-06  15) #define ARCH_IMPLEMENTS_FLUSH_DCACHE_FOLIO 0
522a0032af0055 Matthew Wilcox (Oracle  2021-11-06  16) #endif /* ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE */
522a0032af0055 Matthew Wilcox (Oracle  2021-11-06  17) 

:::::: The code at line 12 was first introduced by commit
:::::: 522a0032af005502507f5f81ae64fdcc82b5d068 Add linux/cacheflush.h

:::::: TO: Matthew Wilcox (Oracle) <willy@...radead.org>
:::::: CC: Matthew Wilcox (Oracle) <willy@...radead.org>

---
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