[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>

diff --git a/arch/x86_64/kernel/entry.S b/arch/x86_64/kernel/entry.S
index 38a7b2d..038dcf7 100644 (file)
--- 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)