[PATCH] consolidate SIGEV_PAD_SIZE

Discussing with Matthew Wilcox some of his outstanding patches lead me to
this patch (among others).

The preamble in struct sigevent can be expressed independently of the
architecture.

Also use __ARCH_SI_PREAMBLE_SIZE on ia64.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

7 files changed, 11 insertions, 20 deletions

diff --git a/include/asm-alpha/siginfo.h b/include/asm-alpha/siginfo.h
index 86bcab59c52b..9822362a8424 100644
--- a/include/asm-alpha/siginfo.h
+++ b/include/asm-alpha/siginfo.h
@@ -4,8 +4,6 @@
 #define __ARCH_SI_PREAMBLE_SIZE         (4 * sizeof(int))
 #define __ARCH_SI_TRAPNO
 
-#define SIGEV_PAD_SIZE                  ((SIGEV_MAX_SIZE/sizeof(int)) - 4)
-
 #include <asm-generic/siginfo.h>
 
 #endif
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;
diff --git a/include/asm-ia64/siginfo.h b/include/asm-ia64/siginfo.h
index d55f139cbcdc..9294e4b0c8bc 100644
--- a/include/asm-ia64/siginfo.h
+++ b/include/asm-ia64/siginfo.h
@@ -8,9 +8,7 @@
  *      David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co
  */
 
-#define SI_PAD_SIZE     ((SI_MAX_SIZE/sizeof(int)) - 4)
-
-#define SIGEV_PAD_SIZE  ((SIGEV_MAX_SIZE/sizeof(int)) - 4)
+#define __ARCH_SI_PREAMBLE_SIZE (4 * sizeof(int))
 
 #define HAVE_ARCH_SIGINFO_T
 #define HAVE_ARCH_COPY_SIGINFO
diff --git a/include/asm-mips/siginfo.h b/include/asm-mips/siginfo.h
index 8ddd3c99bcf7..a0e26e6c994d 100644
--- a/include/asm-mips/siginfo.h
+++ b/include/asm-mips/siginfo.h
@@ -11,8 +11,6 @@
 
 #include <linux/config.h>
 
-#define SIGEV_HEAD_SIZE (sizeof(long) + 2*sizeof(int))
-#define SIGEV_PAD_SIZE  ((SIGEV_MAX_SIZE-SIGEV_HEAD_SIZE) / sizeof(int))
 #undef __ARCH_SI_TRAPNO /* exception code needs to fill this ...  */
 
 #define HAVE_ARCH_SIGINFO_T
diff --git a/include/asm-s390/siginfo.h b/include/asm-s390/siginfo.h
index 72303537b732..e0ff1ab054be 100644
--- a/include/asm-s390/siginfo.h
+++ b/include/asm-s390/siginfo.h
@@ -13,12 +13,6 @@
 #define __ARCH_SI_PREAMBLE_SIZE (4 * sizeof(int))
 #endif
 
-#ifdef CONFIG_ARCH_S390X
-#define SIGEV_PAD_SIZE ((SIGEV_MAX_SIZE/sizeof(int)) - 4)
-#else
-#define SIGEV_PAD_SIZE ((SIGEV_MAX_SIZE/sizeof(int)) - 3)
-#endif
-
 #include <asm-generic/siginfo.h>
 
 #endif
diff --git a/include/asm-sparc64/siginfo.h b/include/asm-sparc64/siginfo.h
index 7160449e7cab..df17e47abc1c 100644
--- a/include/asm-sparc64/siginfo.h
+++ b/include/asm-sparc64/siginfo.h
@@ -3,8 +3,6 @@
 
 #define SI_PAD_SIZE32   ((SI_MAX_SIZE/sizeof(int)) - 3)
 
-#define SIGEV_PAD_SIZE  ((SIGEV_MAX_SIZE/sizeof(int)) - 4)
-
 #define __ARCH_SI_PREAMBLE_SIZE (4 * sizeof(int))
 #define __ARCH_SI_TRAPNO
 #define __ARCH_SI_BAND_T int
diff --git a/include/asm-x86_64/siginfo.h b/include/asm-x86_64/siginfo.h
index 7bc15985f124..d09a1e6e7246 100644
--- a/include/asm-x86_64/siginfo.h
+++ b/include/asm-x86_64/siginfo.h
@@ -3,8 +3,6 @@
 
 #define __ARCH_SI_PREAMBLE_SIZE (4 * sizeof(int))
 
-#define SIGEV_PAD_SIZE ((SIGEV_MAX_SIZE/sizeof(int)) - 4)
-
 #include <asm-generic/siginfo.h>
 
 #endif