Fix undefined behavior that blocks compiling with UBSan

Left shifts are not defined in C if they would cause signed overflow,
so these expressions get instrumented, which makes them unusable as
switch values and triggers compile errors when compiling with UBSan.

Change-Id: I0588d4be1e00ba1cfde0eac119ead368b20d10c9

1 files changed, 1 insertions, 1 deletions

diff --git a/firmware/kernel/include/queue.h b/firmware/kernel/include/queue.h
index 6740b88760..a9c3b5a93a 100644
--- a/firmware/kernel/include/queue.h
+++ b/firmware/kernel/include/queue.h
@@ -38,7 +38,7 @@
 /* make sure SYS_EVENT_CLS_BITS has enough range */
 
 /* Bit 31->|S|c...c|i...i| */
-#define SYS_EVENT                 ((long)(int)(1 << 31))
+#define SYS_EVENT                 ((long)(int)(1u << 31))
 #define SYS_EVENT_CLS_BITS        (3)
 #define SYS_EVENT_CLS_SHIFT       (31-SYS_EVENT_CLS_BITS)
 #define SYS_EVENT_CLS_MASK        (((1l << SYS_EVENT_CLS_BITS)-1) << SYS_EVENT_SHIFT)