[v3,04/34] kmsan: Increase the maximum store size to 4096

Commit Message

Ilya Leoshkevich Dec. 13, 2023, 11:24 p.m. UTC

The inline assembly block in s390's chsc() stores that much.

Reviewed-by: Alexander Potapenko <[e-mail]>
Signed-off-by: Ilya Leoshkevich <[e-mail]>
---
 mm/kmsan/instrumentation.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

Patch

diff --git a/mm/kmsan/instrumentation.c b/mm/kmsan/instrumentation.c
index cc3907a9c33a..470b0b4afcc4 100644
--- a/mm/kmsan/instrumentation.c
+++ b/mm/kmsan/instrumentation.c
@@ -110,11 +110,10 @@  void __msan_instrument_asm_store(void *addr, uintptr_t size)
 
 	ua_flags = user_access_save();
 	/*
-	 * Most of the accesses are below 32 bytes. The two exceptions so far
-	 * are clwb() (64 bytes) and FPU state (512 bytes).
-	 * It's unlikely that the assembly will touch more than 512 bytes.
+	 * Most of the accesses are below 32 bytes. The exceptions so far are
+	 * clwb() (64 bytes), FPU state (512 bytes) and chsc() (4096 bytes).
 	 */
-	if (size > 512) {
+	if (size > 4096) {
 		WARN_ONCE(1, "assembly store size too big: %ld\n", size);
 		size = 8;
 	}