x86/asm/entry/64: Use local label to skip around sycall dispatch

Logically, we just want to jump around the following instruction
and its prologue/epilogue:

  call *sys_call_table(,%rax,8)

if the syscall number is too big - we do not specifically target
the "int_ret_from_sys_call" label.

Use a local, numerical label for this jump, for more clarity.

This also makes the code smaller:

 -ffffffff8187756b:      0f 87 0f 00 00 00       ja     ffffffff81877580 <int_ret_from_sys_call>
 +ffffffff8187756b:      77 0f                   ja     ffffffff8187757c <int_ret_from_sys_call>

because jumps to global labels are never translated to short jump
instructions by GAS.

Signed-off-by: Denys Vlasenko <[email protected]>
Cc: Alexei Starovoitov <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Will Drewry <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
[ Improved the changelog. ]
Signed-off-by: Ingo Molnar <[email protected]>

0 files changed, 0 insertions, 0 deletions