s390: rename PIF_SYSCALL_RESTART to PIF_EXECVE_PGSTE_RESTART

PIF_SYSCALL_RESTART is now only used to restart execve when loading
PGSTE binaries. Rename the flag to reflect that, and avoid people
thinking that this bit has anything to do with generic syscall
restarting.
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

arch/s390/include/asm/elf.h

@@ -172,7 +172,7 @@ struct arch_elf_state {
 	    !current->mm->context.alloc_pgste) {		\
 		set_thread_flag(TIF_PGSTE);			\
 		set_pt_regs_flag(task_pt_regs(current),		\
-				 PIF_SYSCALL_RESTART);		\
+				 PIF_EXECVE_PGSTE_RESTART);	\
 		_state->rc = -EAGAIN;				\
 	}							\
 	_state->rc;						\

arch/s390/include/asm/ptrace.h

@@ -11,15 +11,15 @@
 #include <uapi/asm/ptrace.h>
 #include <asm/tpi.h>
 
-#define PIF_SYSCALL		0	/* inside a system call */
-#define PIF_SYSCALL_RESTART	1	/* restart the current system call */
-#define PIF_SYSCALL_RET_SET	2	/* return value was set via ptrace */
-#define PIF_GUEST_FAULT		3	/* indicates program check in sie64a */
-
-#define _PIF_SYSCALL		BIT(PIF_SYSCALL)
-#define _PIF_SYSCALL_RESTART	BIT(PIF_SYSCALL_RESTART)
-#define _PIF_SYSCALL_RET_SET	BIT(PIF_SYSCALL_RET_SET)
-#define _PIF_GUEST_FAULT	BIT(PIF_GUEST_FAULT)
+#define PIF_SYSCALL			0	/* inside a system call */
+#define PIF_EXECVE_PGSTE_RESTART	1	/* restart execve for PGSTE binaries */
+#define PIF_SYSCALL_RET_SET		2	/* return value was set via ptrace */
+#define PIF_GUEST_FAULT			3	/* indicates program check in sie64a */
+
+#define _PIF_SYSCALL			BIT(PIF_SYSCALL)
+#define _PIF_EXECVE_PGSTE_RESTART	BIT(PIF_EXECVE_PGSTE_RESTART)
+#define _PIF_SYSCALL_RET_SET		BIT(PIF_SYSCALL_RET_SET)
+#define _PIF_GUEST_FAULT		BIT(PIF_GUEST_FAULT)
 
 #ifndef __ASSEMBLY__
 

arch/s390/kernel/syscall.c

@@ -134,6 +134,7 @@ static void do_syscall(struct pt_regs *regs)
 	 * work, the ptrace code sets PIF_SYSCALL_RET_SET, which is checked here
 	 * and if set, the syscall will be skipped.
 	 */
+
 	if (unlikely(test_and_clear_pt_regs_flag(regs, PIF_SYSCALL_RET_SET)))
 		goto out;
 	regs->gprs[2] = -ENOSYS;
@@ -141,7 +142,7 @@ static void do_syscall(struct pt_regs *regs)
 		goto out;
 	do {
 		regs->gprs[2] = current->thread.sys_call_table[nr](regs);
-	} while (test_and_clear_pt_regs_flag(regs, PIF_SYSCALL_RESTART));
+	} while (test_and_clear_pt_regs_flag(regs, PIF_EXECVE_PGSTE_RESTART));
 out:
 	syscall_exit_to_user_mode_work(regs);
 }