kasan: use unchecked __memset internally

[ Upstream commit 01a5ad81 ]

KASAN code is supposed to use the unchecked __memset implementation when
accessing its metadata.

Change uses of memset to __memset in mm/kasan/.

Link: https://lkml.kernel.org/r/6f621966c6f52241b5aaa7220c348be90c075371.1696605143.git.andreyknvl@google.com


Fixes: 59e6e098 ("kasan: introduce kasan_complete_mode_report_info")
Fixes: 3c5c3cfb ("kasan: support backing vmalloc space with real shadow memory")
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: kernel test robot <lkp@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Stable-dep-of: b6ea95a3 ("kasan: avoid sleepable page allocation from atomic context")
Signed-off-by: Sasha Levin <sashal@kernel.org>