Re: [patch 00/11] x86/vdso: Cleanups, simmplifications and CLOCK_TAI support

[Florian Weimer]

On 09/14/2018 02:50 PM, Thomas Gleixner wrote:
> Matt attempted to add CLOCK_TAI support to the VDSO clock_gettime()
> implementation, which extended the clockid switch case and added yet
> another slightly different copy of the same code.
>
> Especially the extended switch case is problematic as the compiler tends to
> generate a jump table which then requires to use retpolines.

Does vDSO code really have to use retpolines?  It's in userspace, after all.

Thanks,
Florian