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

From: kernel test robot
Date: Tue Aug 09 2022 - 21:54:48 EST


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@xxxxxxxxx/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@xxxxxxxxx>

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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