tree d9dd381b426ebb1f3a76465099cb5dd2aaca0d29
parent c633544a6154146a210cf158157a1ae7c55473b6
author Max Filippov <jcmvbkbc@gmail.com> 1512451233 -0800
committer Max Filippov <jcmvbkbc@gmail.com> 1513492633 -0800

xtensa: use __memset in __xtensa_clear_user

memset on xtensa is capable of accessing user memory, but KASAN checks
if memset function is actually used for that and reports it as an error:

 ==================================================================
 BUG: KASAN: user-memory-access in padzero+0x4d/0x58
 Write of size 519 at addr 0049ddf9 by task init/1

 Call Trace:
  [<b0189978>] kasan_report+0x160/0x238
  [<b0188818>] check_memory_region+0xf8/0x100
  [<b018891c>] memset+0x20/0x34
  [<b0238b71>] padzero+0x4d/0x58
 ==================================================================

Use __memset in __xtensa_clear_user to avoid that.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>