Messages in this thread | | | Date | Fri, 20 Aug 2021 12:18:45 -0500 | From | Segher Boessenkool <> | Subject | Re: [PATCH] powerpc/32: indirect function call use bctrl rather than blrl in ret_from_kernel_thread |
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On Fri, Aug 20, 2021 at 10:15:11PM +1000, Michael Ellerman wrote: > Christophe Leroy <christophe.leroy@csgroup.eu> writes: > > Copied from commit 89bbe4c798bc ("powerpc/64: indirect function call > > use bctrl rather than blrl in ret_from_kernel_thread") > > > > blrl is not recommended to use as an indirect function call, as it may > > corrupt the link stack predictor. > > Do we know if any 32-bit CPUs have a link stack predictor or similar?
74xx do.
Segher
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