[Xen-changelog] [xen-unstable] arm: comment the use of second_linear_offset() in mm.c

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Tim Deegan <tim@xxxxxxx>
# Date 1360935126 0
# Node ID 980b1273c7116aa43085992888a1bbefa0d17de5
# Parent  759574df84a6e61205e0c28b33243e08a4476045
arm: comment the use of second_linear_offset() in mm.c

Signed-off-by: Tim Deegan <tim@xxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Committed-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---


diff -r 759574df84a6 -r 980b1273c711 xen/arch/arm/mm.c
--- a/xen/arch/arm/mm.c Fri Feb 15 09:24:43 2013 +0000
+++ b/xen/arch/arm/mm.c Fri Feb 15 13:32:06 2013 +0000
@@ -41,6 +41,9 @@ struct domain *dom_xen, *dom_io, *dom_co
 
 /* Static start-of-day pagetables that we use before the allocators are up */
 lpae_t xen_pgtable[LPAE_ENTRIES] __attribute__((__aligned__(4096)));
+/* N.B. The second-level table is 4 contiguous pages long, and covers
+ * all addresses from 0 to 0xffffffff.  Offsets into it are calculated
+ * with second_linear_offset(), not second_table_offset(). */
 lpae_t xen_second[LPAE_ENTRIES*4] __attribute__((__aligned__(4096*4)));
 lpae_t xen_fixmap[LPAE_ENTRIES] __attribute__((__aligned__(4096)));
 static lpae_t xen_xenmap[LPAE_ENTRIES] __attribute__((__aligned__(4096)));

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