sh: Document PTEL 31:29 use on PTEA-wielding parts.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/include/asm-sh/pgtable_32.h b/include/asm-sh/pgtable_32.h
index 7efc95404c645eea31a74cb683aa650f0bd3a623..3e3557c53c558c9c3f244ef9148313a4cd64dc87 100644 (file)
--- a/include/asm-sh/pgtable_32.h
+++ b/include/asm-sh/pgtable_32.h
@@ -22,8 +22,9 @@
  * - Bits 10 and 11 are low bits of the PPN that are reserved on >= 4K pages.
  *   Bit 10 is used for _PAGE_ACCESSED, bit 11 remains unused.
  *
- * - Bits 31, 30, and 29 remain unused by everyone and can be used for future
- *   software flags, although care must be taken to update _PAGE_CLEAR_FLAGS.
+ * - On 29 bit platforms, bits 31 to 29 are used for the space attributes
+ *   and timing control which (together with bit 0) are moved into the
+ *   old-style PTEA on the parts that support it.
  *
  * XXX: Leave the _PAGE_FILE and _PAGE_WT overhaul for a rainy day.
  *