MIPS: asm: syscall: Add the syscall_rollback function

The syscall_rollback function is used by seccomp-bpf but it was never
added for MIPS. It doesn't need to do anything as none of the registers
are clobbered if the system call has been denied by the seccomp filter.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Reviewed-by: James Hogan <james.hogan@imgtec.com>
Reviewed-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6403/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/include/asm/syscall.h b/arch/mips/include/asm/syscall.h
index 33e8dbfc1b631626b3f52dd9c60d27957ae0f364..2981ef5bb0922a75b03803f2f495368b54fcc6d4 100644 (file)
--- a/arch/mips/include/asm/syscall.h
+++ b/arch/mips/include/asm/syscall.h
@@ -65,6 +65,12 @@ static inline long syscall_get_return_value(struct task_struct *task,
        return regs->regs[2];
 }
 
+static inline void syscall_rollback(struct task_struct *task,
+                                   struct pt_regs *regs)
+{
+       /* Do nothing */
+}
+
 static inline void syscall_set_return_value(struct task_struct *task,
                                            struct pt_regs *regs,
                                            int error, long val)