* Josh Poimboeuf <jpoim...@redhat.com> wrote:
> On Thu, Aug 31, 2017 at 12:25:42PM -0500, Josh Poimboeuf wrote:
> > 2) Put "sp" in the clobbers list instead of as an i/o constraint. This
> > mostly works for GCC, and doesn't break clang. However, it causes
> > GCC to insert a "lea -0x10(%rbp),%rsp" in the epilogue of every
> > affected function.
>
> And maybe this extra instruction is negligible for performance and not a
> big deal? I might look at this one after the holiday too.
Please do statistics of how many functions are affected, on a defconfig-ish
kernel.
Thanks,
Ingo
