Merge patch series "RISC-V: Enable cbo.zero in usermode"

Andrew Jones <ajones@ventanamicro.com> says:

In order for usermode to issue cbo.zero, it needs privilege granted to
issue the extension instruction (patch 2) and to know that the extension
is available and its block size (patch 3). Patch 1 could be separate from
this series (it just fixes up some error messages), patches 4-5 convert
the hwprobe selftest to a statically-linked, TAP test and patch 6 adds a
new hwprobe test for the new information as well as testing CBO
instructions can or cannot be issued as appropriate.

* b4-shazam-merge:
  RISC-V: selftests: Add CBO tests
  RISC-V: selftests: Convert hwprobe test to kselftest API
  RISC-V: selftests: Statically link hwprobe test
  RISC-V: hwprobe: Expose Zicboz extension and its block size
  RISC-V: Enable cbo.zero in usermode
  RISC-V: Make zicbom/zicboz errors consistent

Link: https://lore.kernel.org/r/20230918131518.56803-8-ajones@ventanamicro.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

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