linux-kernel - [arm-integrator:kernel-in-vmalloc-v5.18-rc1 8/9] lib/test_free_pages.c:20:36: warning: incompatible integer to pointer conversion passing 'unsigned long' to parameter of type 'const void *'

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Date:   Tue, 17 May 2022 21:56:59 +0800
From:   kernel test robot <lkp@...el.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [arm-integrator:kernel-in-vmalloc-v5.18-rc1 8/9]
 lib/test_free_pages.c:20:36: warning: incompatible integer to pointer
 conversion passing 'unsigned long' to parameter of type 'const void *'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator.git kernel-in-vmalloc-v5.18-rc1
head:   67a8d6eb3d015908f35d6091c02f17d7c3b55bf3
commit: 52cbc963c5c9daba74109e9782e3487cdf48fe5c [8/9] ARM: Compile the kernel into VMALLOC
config: arm-randconfig-r021-20220516 (https://download.01.org/0day-ci/archive/20220517/202205172107.C9n2wfmb-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 853fa8ee225edf2d0de94b0dcbd31bea916e825e)
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 arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator.git/commit/?id=52cbc963c5c9daba74109e9782e3487cdf48fe5c
        git remote add arm-integrator https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator.git
        git fetch --no-tags arm-integrator kernel-in-vmalloc-v5.18-rc1
        git checkout 52cbc963c5c9daba74109e9782e3487cdf48fe5c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash lib/

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 >>):

>> lib/test_free_pages.c:20:36: warning: incompatible integer to pointer conversion passing 'unsigned long' to parameter of type 'const void *' [-Wint-conversion]
                   struct page *page = virt_to_page(addr);
                                                    ^~~~
   arch/arm/include/asm/memory.h:442:53: note: expanded from macro 'virt_to_page'
   #define virt_to_page(kaddr)     pfn_to_page(virt_to_pfn(kaddr))
                                                           ^~~~~
   include/asm-generic/memory_model.h:40:27: note: expanded from macro '__pfn_to_page'
   ({      unsigned long __pfn = (pfn);                    \
                                  ^~~
   arch/arm/include/asm/memory.h:323:53: note: passing argument to parameter 'p' here
   static inline unsigned long virt_to_pfn(const void *p)
                                                       ^
   1 warning generated.


vim +20 lib/test_free_pages.c

e320d3012d25b1 Matthew Wilcox (Oracle  2020-10-13  13) 
e320d3012d25b1 Matthew Wilcox (Oracle  2020-10-13  14) static void test_free_pages(gfp_t gfp)
e320d3012d25b1 Matthew Wilcox (Oracle  2020-10-13  15) {
e320d3012d25b1 Matthew Wilcox (Oracle  2020-10-13  16) 	unsigned int i;
e320d3012d25b1 Matthew Wilcox (Oracle  2020-10-13  17) 
e320d3012d25b1 Matthew Wilcox (Oracle  2020-10-13  18) 	for (i = 0; i < 1000 * 1000; i++) {
e320d3012d25b1 Matthew Wilcox (Oracle  2020-10-13  19) 		unsigned long addr = __get_free_pages(gfp, 3);
e320d3012d25b1 Matthew Wilcox (Oracle  2020-10-13 @20) 		struct page *page = virt_to_page(addr);
e320d3012d25b1 Matthew Wilcox (Oracle  2020-10-13  21) 
e320d3012d25b1 Matthew Wilcox (Oracle  2020-10-13  22) 		/* Simulate page cache getting a speculative reference */
e320d3012d25b1 Matthew Wilcox (Oracle  2020-10-13  23) 		get_page(page);
e320d3012d25b1 Matthew Wilcox (Oracle  2020-10-13  24) 		free_pages(addr, 3);
e320d3012d25b1 Matthew Wilcox (Oracle  2020-10-13  25) 		put_page(page);
e320d3012d25b1 Matthew Wilcox (Oracle  2020-10-13  26) 	}
e320d3012d25b1 Matthew Wilcox (Oracle  2020-10-13  27) }
e320d3012d25b1 Matthew Wilcox (Oracle  2020-10-13  28) 

:::::: The code at line 20 was first introduced by commit
:::::: e320d3012d25b1fb5f3df4edb7bd44a1c362ec10 mm/page_alloc.c: fix freeing non-compound pages

:::::: TO: Matthew Wilcox (Oracle) <willy@...radead.org>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

-- 
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