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...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

...atic 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. > > I don't think this is a consensus position, and it obviously depends on the > (sub)architecture. It does, but we are not building kernels for specific micro architectures nor do distros AFAIK. But that aside, even with jump tables...