csky/syscall_trace: Fixup return processing flow

The function tracehook_report_syscall_entry's return value is
__must_check attribute. We should add return processing flow in
ptrace.c and set the syscall number to -1 when failed just like
riscv's.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Arnd Bergmann <arnd@arndb.de>

1 files changed, 7 insertions, 0 deletions

diff --git a/arch/csky/include/asm/syscall.h b/arch/csky/include/asm/syscall.h
index 850b694a463e..8278658e74f9 100644
--- a/arch/csky/include/asm/syscall.h
+++ b/arch/csky/include/asm/syscall.h
@@ -17,6 +17,13 @@ syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
 }
 
 static inline void
+syscall_set_nr(struct task_struct *task, struct pt_regs *regs,
+	       int sysno)
+{
+	regs_syscallid(regs) = sysno;
+}
+
+static inline void
 syscall_rollback(struct task_struct *task, struct pt_regs *regs)
 {
 	regs->a0 = regs->orig_a0;