[Bug libc/20492] New: aarch64 lacks sysconf data for caches

["rth at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20492

            Bug ID: 20492
           Summary: aarch64 lacks sysconf data for caches
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: rth at gcc dot gnu.org
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

I know that most of this data is not available from userspace.
For some platforms it is passed down from the kernel in auxvec;
perhaps this should happen for arm as well.

But in the meantime, surely dczid_el0 is a decent approximation
of the L1 cacheline size.

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