[linux-next:master 4868/5109] arch/alpha/include/uapi/asm/mman.h:53:0: warning: "MADV_FREE" redefined

[kbuild test robot <fengguang.wu@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   47ca23615a59f1879e6a2d2fe63d130abdb5c810
commit: d53d95838c7d04a11245ad0982f72ed13d03c4db [4868/5109] arch/*/include/uapi/asm/mman.h: : let MADV_FREE have same value for all architectures
config: alpha-defconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout d53d95838c7d04a11245ad0982f72ed13d03c4db
        # save the attached .config to linux build tree
        make.cross ARCH=alpha 

All warnings (new ones prefixed by >>):

   In file included from include/uapi/linux/mman.h:4:0,
                    from include/linux/mman.h:8,
                    from fs/proc/array.c:62:
>> arch/alpha/include/uapi/asm/mman.h:53:0: warning: "MADV_FREE" redefined
    #define MADV_FREE 8  /* free pages only if memory pressure */
    ^
   arch/alpha/include/uapi/asm/mman.h:50:0: note: this is the location of the previous definition
    #define MADV_FREE 7  /* free pages only if memory pressure */
    ^

vim +/MADV_FREE +53 arch/alpha/include/uapi/asm/mman.h

    37	
    38	#define MCL_CURRENT	 8192		/* lock all currently mapped pages */
    39	#define MCL_FUTURE	16384		/* lock all additions to address space */
    40	#define MCL_ONFAULT	32768		/* lock all pages that are faulted in */
    41	
    42	#define MLOCK_ONFAULT	0x01		/* Lock pages in range after they are faulted in, do not prefault */
    43	
    44	#define MADV_NORMAL	0		/* no further special treatment */
    45	#define MADV_RANDOM	1		/* expect random page references */
    46	#define MADV_SEQUENTIAL	2		/* expect sequential page references */
    47	#define MADV_WILLNEED	3		/* will need these pages */
    48	#define	MADV_SPACEAVAIL	5		/* ensure resources are available */
    49	#define MADV_DONTNEED	6		/* don't need these pages */
    50	#define MADV_FREE	7		/* free pages only if memory pressure */
    51	
    52	/* common/generic parameters */
  > 53	#define MADV_FREE	8		/* free pages only if memory pressure */
    54	#define MADV_REMOVE	9		/* remove these pages & resources */
    55	#define MADV_DONTFORK	10		/* don't inherit across fork */
    56	#define MADV_DOFORK	11		/* do inherit across fork */
    57	
    58	#define MADV_MERGEABLE   12		/* KSM may merge identical pages */
    59	#define MADV_UNMERGEABLE 13		/* KSM may not merge identical pages */
    60	
    61	#define MADV_HUGEPAGE	14		/* Worth backing with hugepages */

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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