arm64: Fix outdated TCR setup comment

The arm64 kernel has long be able to use more than 39bit VAs.
Since day one, actually. Let's rewrite the offending comment.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: David Brazdil <dbrazdil@google.com>
Link: https://lore.kernel.org/r/20210208095732.3267263-3-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S
index 1f7ee8c..ece7854 100644 (file)
--- a/arch/arm64/mm/proc.S
+++ b/arch/arm64/mm/proc.S
@@ -464,8 +464,8 @@ SYM_FUNC_START(__cpu_setup)
 #endif
        msr     mair_el1, x5
        /*
-        * Set/prepare TCR and TTBR. We use 512GB (39-bit) address range for
-        * both user and kernel.
+        * Set/prepare TCR and TTBR. TCR_EL1.T1SZ gets further
+        * adjusted if the kernel is compiled with 52bit VA support.
         */
        mov_q   x10, TCR_TxSZ(VA_BITS) | TCR_CACHE_FLAGS | TCR_SMP_FLAGS | \
                        TCR_TG_FLAGS | TCR_KASLR_FLAGS | TCR_ASID16 | \