On Fri, Jul 15, 2022 at 03:41:20PM -0300, Tulio Magno Quites Machado Filho wrote:

Nicholas Piggin [off-list ref] writes:

quoted

+PPC_FEATURE_ARCH_2_05
+    The processor supports the v2.05 userlevel architecture. Processors
+    supporting later architectures also set this feature.

I don't think this bit is enabled when processors support later architectures.
In my tests, this behavior started only with v2.06, i.e. processors that
support v2.07 enable bit v2.06, but do not enable bit v2.05.

That is a usability problem.  Can it be fixed, or will that create its
own compatibility problems?  In practice I mean.  If it is, the C
libraries could fix it up, for new programs, and then after a while the
kernel can do the sane thing?

How big is the problem, anyway?  Is it only 2.05, or also 2.04, 2.03?


Segher