On Thu, 4 Jan 2018, Alan Cox wrote: > On Wed, 3 Jan 2018 16:15:01 -0800 > Andi Kleen <a...@firstfloor.org> wrote: > > > > It should be a CPU_BUG bit as we have for the other mess. And that can be > > > used for patching. > > > > It has to be done at compile time because it requires a compiler option. > > > > Most of the indirect calls are in C code. > > > > So it cannot just patched in, only partially out. > > You can replace the pushl ; jmp with an alternatives section (although > there might be a lot of them). Even if gcc isn't smart enough to do that > perl is.
So you say, that we finally need a perl interpreter in the kernel to do alternative patching? Thanks, tglx