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[v7,21/38] kmsan: Accept ranges starting with 0 on s390

Message ID 20240621113706.315500-22-iii@linux.ibm.com (mailing list archive)
State Handled Elsewhere
Headers show
Series kmsan: Enable on s390 | expand

Commit Message

Ilya Leoshkevich June 21, 2024, 11:35 a.m. UTC 
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 mbox series

Patch

diff --git a/mm/kmsan/init.c b/mm/kmsan/init.c
index 9de76ac7062c..3f8b1bbb9060 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);