[PATCH] Add v850 support for `sys_restart_syscall'

arch/v850/kernel/entry.S

@@ -781,7 +781,7 @@ C_END(trap_table)
 	
 	.align 4
 C_DATA(sys_call_table):
-	.long CSYM(sys_ni_syscall)	// 0  -  old "setup()" system call
+	.long CSYM(sys_restart_syscall)	// 0
 	.long CSYM(sys_exit)
 	.long sys_fork_wrapper
 	.long CSYM(sys_read)

arch/v850/kernel/signal.c

@@ -439,19 +439,23 @@ handle_signal(unsigned long sig, siginfo_t *info, sigset_t *oldset,
 	if (PT_REGS_SYSCALL (regs)) {
 		/* If so, check system call restarting.. */
 		switch (regs->gpr[GPR_RVAL]) {
-			case -ERESTARTNOHAND:
+		case -ERESTART_RESTARTBLOCK:
+			current_thread_info()->restart_block.fn =
+				do_no_restart_syscall;
+			/* fall through */
+		case -ERESTARTNOHAND:
+			regs->gpr[GPR_RVAL] = -EINTR;
+			break;
+
+		case -ERESTARTSYS:
+			if (!(ka->sa.sa_flags & SA_RESTART)) {
 				regs->gpr[GPR_RVAL] = -EINTR;
 				break;
-
-			case -ERESTARTSYS:
-				if (!(ka->sa.sa_flags & SA_RESTART)) {
-					regs->gpr[GPR_RVAL] = -EINTR;
-					break;
-				}
+			}
 			/* fallthrough */
-			case -ERESTARTNOINTR:
-				regs->gpr[12] = PT_REGS_SYSCALL (regs);
-				regs->pc -= 4; /* Size of `trap 0' insn.  */
+		case -ERESTARTNOINTR:
+			regs->gpr[12] = PT_REGS_SYSCALL (regs);
+			regs->pc -= 4; /* Size of `trap 0' insn.  */
 		}
 
 		PT_REGS_SET_SYSCALL (regs, 0);
@@ -510,14 +514,19 @@ int do_signal(struct pt_regs *regs, sigset_t *oldset)
 
 	/* Did we come from a system call? */
 	if (PT_REGS_SYSCALL (regs)) {
+		int rval = (int)regs->gpr[GPR_RVAL];
 		/* Restart the system call - no handlers present */
-		if (regs->gpr[GPR_RVAL] == (v850_reg_t)-ERESTARTNOHAND ||
-		    regs->gpr[GPR_RVAL] == (v850_reg_t)-ERESTARTSYS ||
-		    regs->gpr[GPR_RVAL] == (v850_reg_t)-ERESTARTNOINTR)
+		if (rval == -ERESTARTNOHAND
+		    || rval == -ERESTARTSYS
+		    || rval == -ERESTARTNOINTR)
 		{
 			regs->gpr[12] = PT_REGS_SYSCALL (regs);
 			regs->pc -= 4; /* Size of `trap 0' insn.  */
 		}
+		else if (rval == -ERESTART_RESTARTBLOCK) {
+			regs->gpr[12] = __NR_restart_syscall;
+			regs->pc -= 4; /* Size of `trap 0' insn.  */
+		}
 	}
 	return 0;
 }

include/asm-v850/current.h

@@ -14,8 +14,11 @@
 #ifndef __V850_CURRENT_H__
 #define __V850_CURRENT_H__
 
+#ifndef __ASSEMBLY__ /* <linux/thread_info.h> is not asm-safe.  */
+#include <linux/thread_info.h>
+#endif
+
 #include <asm/macrology.h>
-#include <asm/thread_info.h>
 
 
 /* Register used to hold the current task pointer while in the kernel.

include/asm-v850/processor.h

@@ -15,9 +15,11 @@
 #define __V850_PROCESSOR_H__
 
 #include <linux/config.h>
+#ifndef __ASSEMBLY__ /* <linux/thread_info.h> is not asm-safe.  */
+#include <linux/thread_info.h>
+#endif
 
 #include <asm/ptrace.h>
-#include <asm/thread_info.h>
 #include <asm/entry.h>
 
 /* Some code expects `segment' stuff to be defined here.  */

include/asm-v850/thread_info.h

@@ -31,15 +31,19 @@ struct thread_info {
 	unsigned long		flags;		/* low level flags */
 	int			cpu;		/* cpu we're on */
 	int			preempt_count;
+	struct restart_block	restart_block;
 };
 
-#define INIT_THREAD_INFO(tsk)			\
-{						\
-	.task =		&tsk,			\
-	.exec_domain =	&default_exec_domain,	\
-	.flags =	0,			\
-	.cpu =		0,			\
-	.preempt_count = 1			\
+#define INIT_THREAD_INFO(tsk)						      \
+{									      \
+	.task =		&tsk,						      \
+	.exec_domain =	&default_exec_domain,				      \
+	.flags =	0,						      \
+	.cpu =		0,						      \
+	.preempt_count = 1,						      \
+	.restart_block = {						      \
+		.fn = do_no_restart_syscall,				      \
+	},								      \
 }
 
 #define init_thread_info	(init_thread_union.thread_info)
@@ -67,8 +71,6 @@ struct thread_info {
 #define TI_FLAGS	8
 #define TI_CPU		12
 #define TI_PREEMPT	16
-#define TI_SOFTIRQ	20
-#define TI_HARDIRQ	24
 
 #define PREEMPT_ACTIVE		0x4000000
 

include/asm-v850/unistd.h

@@ -16,6 +16,7 @@
 
 #include <asm/clinkage.h>
 
+#define __NR_restart_syscall	  0
 #define __NR_exit		  1
 #define __NR_fork		  2
 #define __NR_read		  3