On Thu, Oct 12, 2023 at 11:22 PM H. Peter Anvin wrote:
>
> On 10/12/23 14:17, Uros Bizjak wrote:
> >>
> >> Are you PIC-adjusting the percpu variables as well?
> >
> > After this patch (and after fixing percpu_stable_op to use "a" operand
> > modifier on GCC), the only *one* remaining absolute refe
On 10/12/23 14:17, Uros Bizjak wrote:
Are you PIC-adjusting the percpu variables as well?
After this patch (and after fixing percpu_stable_op to use "a" operand
modifier on GCC), the only *one* remaining absolute reference to
percpu variable remain in xen-head.S, where:
movq$INIT_PER
On Thu, Oct 12, 2023 at 11:08 PM H. Peter Anvin wrote:
>
> On 10/12/23 13:59, Uros Bizjak wrote:
> > On Thu, Oct 12, 2023 at 10:53 PM Dave Hansen wrote:
> >>
> >> On 10/12/23 13:12, Uros Bizjak wrote:
> >>> The last patch introduces (%rip) suffix and uses it for x86_64 target,
> >>> resulting in
On 10/12/23 13:59, Uros Bizjak wrote:
On Thu, Oct 12, 2023 at 10:53 PM Dave Hansen wrote:
On 10/12/23 13:12, Uros Bizjak wrote:
The last patch introduces (%rip) suffix and uses it for x86_64 target,
resulting in a small code size decrease: text data bss dec hex filename
25510677 4386685 80838
On Thu, Oct 12, 2023 at 10:53 PM Dave Hansen wrote:
>
> On 10/12/23 13:12, Uros Bizjak wrote:
> > The last patch introduces (%rip) suffix and uses it for x86_64 target,
> > resulting in a small code size decrease: text data bss dec hex filename
> > 25510677 4386685 808388 30705750 1d48856 vmlinux-
On 10/12/23 13:12, Uros Bizjak wrote:
> The last patch introduces (%rip) suffix and uses it for x86_64 target,
> resulting in a small code size decrease: text data bss dec hex filename
> 25510677 4386685 808388 30705750 1d48856 vmlinux-new.o 25510629 4386685
> 808388 30705702 1d48826 vmlinux-old.o
The following patch series introduces %rip-relative addressing to
PER_CPU_VAR macro. Instruction with %rip-relative address operand is
one byte shorter than its absolute address counterpart and is also
compatible with position independent executable (-fpie) build.
The first three patches are clean
