[PATCH v2 20/33] kmsan: Accept ranges starting with 0 on s390
flat view
STALE1028d
REVIEWED: 4 (4M)
From: Ilya Leoshkevich <iii@linux.ibm.com>
Date: 2023-11-21 22:03:42
Also in:
linux-mm, linux-s390, lkml
Subsystem:
kmsan, memory management, the rest · Maintainers:
Alexander Potapenko, Andrew Morton, Linus Torvalds
Revision v2 of 7 in this series; 1 review trailer (1 from subsystem maintainers).
Revisions (7)
On s390 the virtual address 0 is valid (current CPU's lowcore is mapped there), therefore KMSAN should not complain about it. Disable the respective check on s390. There doesn't seem to be a Kconfig option to describe this situation, so explicitly check for s390. Reviewed-by: Alexander Potapenko <glider@google.com> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> --- mm/kmsan/init.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/mm/kmsan/init.c b/mm/kmsan/init.c
index ffedf4dbc49d..7a3df4d359f8 100644
--- a/mm/kmsan/init.c
+++ b/mm/kmsan/init.c@@ -33,7 +33,10 @@ static void __init kmsan_record_future_shadow_range(void *start, void *end) bool merged = false; KMSAN_WARN_ON(future_index == NUM_FUTURE_RANGES); - KMSAN_WARN_ON((nstart >= nend) || !nstart || !nend); + KMSAN_WARN_ON((nstart >= nend) || + /* Virtual address 0 is valid on s390. */ + (!IS_ENABLED(CONFIG_S390) && !nstart) || + !nend); nstart = ALIGN_DOWN(nstart, PAGE_SIZE); nend = ALIGN(nend, PAGE_SIZE);
--
2.41.0