linux-kernel - arch/um/os-Linux/mem.c:28:6: warning: no previous prototype for 'kasan_map

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Date:   Wed, 10 Aug 2022 09:53:59 +0800
From:   kernel test robot <lkp@...el.com>
To:     Patricia Alfonso <trishalfonso@...gle.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Richard Weinberger <richard@....at>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        David Gow <davidgow@...gle.com>,
        Johannes Berg <johannes@...solutions.net>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>
Subject: arch/um/os-Linux/mem.c:28:6: warning: no previous prototype for
 'kasan_map_memory'

Hi Patricia,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   15205c2829ca2cbb5ece5ceaafe1171a8470e62b
commit: 5b301409e8bc5d7fad2ee138be44c5c529dd0874 UML: add support for KASAN under x86_64
date:   3 weeks ago
config: um-x86_64_defconfig (https://download.01.org/0day-ci/archive/20220810/202208100915.RsOr5Nax-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/torvalds/linux.git/commit/?id=5b301409e8bc5d7fad2ee138be44c5c529dd0874
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 5b301409e8bc5d7fad2ee138be44c5c529dd0874
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=um SUBARCH=x86_64 SHELL=/bin/bash

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

All warnings (new ones prefixed by >>):

>> arch/um/os-Linux/mem.c:28:6: warning: no previous prototype for 'kasan_map_memory' [-Wmissing-prototypes]
      28 | void kasan_map_memory(void *start, size_t len)
         |      ^~~~~~~~~~~~~~~~
   arch/um/os-Linux/mem.c:212:13: warning: no previous prototype for 'check_tmpexec' [-Wmissing-prototypes]
     212 | void __init check_tmpexec(void)
         |             ^~~~~~~~~~~~~


vim +/kasan_map_memory +28 arch/um/os-Linux/mem.c

    19	
    20	/*
    21	 * kasan_map_memory - maps memory from @start with a size of @len.
    22	 * The allocated memory is filled with zeroes upon success.
    23	 * @start: the start address of the memory to be mapped
    24	 * @len: the length of the memory to be mapped
    25	 *
    26	 * This function is used to map shadow memory for KASAN in uml
    27	 */
  > 28	void kasan_map_memory(void *start, size_t len)
    29	{
    30		if (mmap(start,
    31			 len,
    32			 PROT_READ|PROT_WRITE,
    33			 MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE|MAP_NORESERVE,
    34			 -1,
    35			 0) == MAP_FAILED) {
    36			os_info("Couldn't allocate shadow memory: %s\n.",
    37				strerror(errno));
    38			exit(1);
    39		}
    40	}
    41	

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