[PATCH v2] aarch64: Add MTE mode tunable

[Wilco Dijkstra]

Hi Yury,

+  /* Check if MTE is supported.  */
+  if (GLRO (dl_hwcap2) & HWCAP2_MTE)
+    TUNABLE_GET (glibc, cpu, mtemode, tunable_val_t *,
+                TUNABLE_CALLBACK (set_aarch64_mte_mode));
+  else
+    GL (dl_aarch64_mte_mode) = MTE_MODE_DISABLED;
+

Do we need the else if we skip initialization if the HWCAP is set
but the tunable is not? If we can rely on default initialization to
MTE_MODE_DISABLED in that case, why not here too?

Cheers,
Wilco