On Mon, Jul 27, 2015 at 1:33 PM, Denys Vlasenko <[email protected]> wrote: > This change swaps a few instructions in final register restoring/zeroing > section of SYSENTER fast path, and adds/deletes a few empty lines. > > After this, the difference between SYSENTER and SYCALL fast paths > (after the prologue which saved pt_regs) is very small: > they differ merely in the choice of register to hold arg6 (EBP or R9) > and in the value of EDX on exit: SYSENTER ABI doesn't need to preserve it, > so it is zeroed. SYSCALL preserves it:
Acked-by: Andy Lutomirski <[email protected]> (I haven't tested it, but this looks Obviously Correct (tm) and there's no funny stack manipulation in the middle of the changes that could break things.) --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
