[PATCH] x86-64: Fix ENOSYS in system call tracing

This patch:

- out of range system calls failing to return -ENOSYS under
  system call tracing

[AK: split out from another patch by Jan as separate bugfix]

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/x86_64/kernel/entry.S b/arch/x86_64/kernel/entry.S
index 38a7b2d528e2..038dcf733a1b 100644
--- a/arch/x86_64/kernel/entry.S
+++ b/arch/x86_64/kernel/entry.S
@@ -315,6 +315,8 @@ tracesys:
         LOAD_ARGS ARGOFFSET  /* reload args from stack in case ptrace changed it */
         RESTORE_REST
         cmpq $__NR_syscall_max,%rax
+        movq $-ENOSYS,%rcx
+        cmova %rcx,%rax
         ja  1f
         movq %r10,%rcx  /* fixup for C */
         call *sys_call_table(,%rax,8)