On Wed, Apr 01, 2020 at 06:54:44PM +0100, Catalin Marinas wrote: > On Tue, Mar 31, 2020 at 08:44:59PM +0100, Mark Brown wrote: > > Compilers with branch protection support can be configured to enable it by > > default, it is likely that distributions will do this as part of deploying > > branch protection system wide. As well as the slight overhead from having > > some extra NOPs for unused branch protection features this can cause more > > serious problems when the kernel is providing pointer authentication to > > userspace but not built for pointer authentication itself. > With 5.7 you won't be able to configure user and kernel PAC support > independently. So, I guess that's something only for prior kernel > versions. Yes, it's really for the benefit of stable at this point - hence the Cc. Going forward it's hopefully more for defensiveness than anything else, it's possible something similar might come up with some future stuff but ideally not.
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