riscv: turn pgtable_l4|[l5]_enabled to static key for RV64
On a specific HW platform, pgtable_l4|[l5]_enabled won't change after
boot, and the check sits at hot code path, this characteristic makes it
suitable for optimization with static key.
_pgtable_l4|[l5]_enabled is used very early during boot, even is used
with MMU off, so the static key mechanism isn't ready. For this case,
we use another static key _pgtable_lx_ready to indicate whether we
have finalised pgtable_l4|[l5]_enabled or not, then fall back to
_pgtable_l4|[l5]_enabled_early bool.
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20220821140918.3613-3-jszhang@kernel.org/
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
7 files changed
