1 files changed, 10 insertions, 3 deletions

diff --git a/include/asm-generic/siginfo.h b/include/asm-generic/siginfo.h
index 9cac8e8dde51..8786e01e0db8 100644
--- a/include/asm-generic/siginfo.h
+++ b/include/asm-generic/siginfo.h
@@ -236,11 +236,18 @@ typedef struct siginfo {
 #define SIGEV_THREAD    2       /* deliver via thread creation */
 #define SIGEV_THREAD_ID 4       /* deliver to thread */
 
-#define SIGEV_MAX_SIZE  64
-#ifndef SIGEV_PAD_SIZE
-#define SIGEV_PAD_SIZE  ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
+/*
+ * This works because the alignment is ok on all current architectures
+ * but we leave open this being overridden in the future
+ */
+#ifndef __ARCH_SIGEV_PREAMBLE_SIZE
+#define __ARCH_SIGEV_PREAMBLE_SIZE      (sizeof(int) * 2 + sizeof(sigval_t))
 #endif
 
+#define SIGEV_MAX_SIZE  64
+#define SIGEV_PAD_SIZE  ((SIGEV_MAX_SIZE - __ARCH_SIGEV_PREAMBLE_SIZE) \
+                / sizeof(int))
+
 typedef struct sigevent {
         sigval_t sigev_value;
         int sigev_signo;