[ARM PATCH] 2529/1: Add semtimedop support - semop() with a timeout (with...

[ARM PATCH] 2529/1: Add semtimedop support - semop() with a timeout (with demuxed IPC syscall entry added)

Patch from George G. Davis

Adds ARM support for the semtimedop() function - semop with a timeout.
This updates ARM with same support added for other archs long ago.
Also includes sys_semtimeop syscall table entry appended to end of
syscall table as per RMK\'s request.

Signed-off-by: George G. Davis
Signed-off-by: Russell King

arch/arm/kernel/calls.S

@@ -326,6 +326,7 @@ __syscall_start:
 		.long	sys_add_key
 /* 310 */	.long	sys_request_key
 		.long	sys_keyctl
+		.long	sys_semtimedop
 __syscall_end:
 
 		.rept	NR_syscalls - (__syscall_end - __syscall_start) / 4

arch/arm/kernel/sys_arm.c

@@ -169,7 +169,11 @@ asmlinkage int sys_ipc(uint call, int first, int second, int third,
 
 	switch (call) {
 	case SEMOP:
-		return sys_semop(first, (struct sembuf __user *)ptr, second);
+		return sys_semtimedop (first, (struct sembuf __user *)ptr, second, NULL);
+	case SEMTIMEDOP:
+		return sys_semtimedop(first, (struct sembuf __user *)ptr, second,
+					(const struct timespec __user *)fifth);
+
 	case SEMGET:
 		return sys_semget (first, second, third);
 	case SEMCTL: {

include/asm-arm/ipc.h

@@ -14,6 +14,7 @@ struct ipc_kludge {
 #define SEMOP		 1
 #define SEMGET		 2
 #define SEMCTL		 3
+#define SEMTIMEDOP	 4
 #define MSGSND		11
 #define MSGRCV		12
 #define MSGGET		13

include/asm-arm/unistd.h

@@ -345,6 +345,10 @@
 #define __NR_request_key		(__NR_SYSCALL_BASE+310)
 #define __NR_keyctl			(__NR_SYSCALL_BASE+311)
 
+#if 0 /* reserved for un-muxing ipc */
+#define __NR_semtimedop			(__NR_SYSCALL_BASE+312)
+#endif
+
 /*
  * The following SWIs are ARM private.
  */