| Date | Fri, 14 Sep 2018 15:05:23 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [patch 00/11] x86/vdso: Cleanups, simmplifications and CLOCK_TAI support |
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On Fri, 14 Sep 2018, Florian Weimer wrote:
> 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.
Unless you have IBRS/STIPB enabled, you need user space ratpoutine as well.
Thanks,
tglx
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