* Denys Vlasenko <[email protected]> wrote:
> Before this patch, r11 was saved in pt_regs->r11.
> Which looks natural, but requires messy shuffling to/from iret frame
> whenever ptrace or e.g. iopl wants to modify flags - because
> that's how this register is used by SYSCALL/SYSRET.
>
> This patch saves r11 in pt_regs->flags,
> and uses that value for SYSRET64 insn. Shuffling is eliminated.
>
> stub_iopl is no longer needed: pt_regs->flags needs no fixing up.
Could you please split this into two patches: R11 saving, and
stub_iopl removal?
For x86/asm changes we want as small changes as physically possible.
Thanks,
Ingo
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