[Xen-devel] [PATCH] xen: arm: Document xenheap_megabytes limitation

["Chris (Christopher) Brand" <chris.brand@xxxxxxxxxxxx>]

In setup_mm(), the value passed as xenheap_megabytes gets
converted to pages and passed to setup_xenheap_mappings(),
which in turn passes it to create_32mb_mappings(), which
contains an ASSERT that the value passed is a multiple of
32MB. So specifying any value that is not an integer multiple
of 32 will cause Xen to hit this assert and fail to boot.

Signed-off-by: Chris Brand <chris.brand@xxxxxxxxxxxx>
---
 docs/misc/xen-command-line.markdown | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/misc/xen-command-line.markdown 
b/docs/misc/xen-command-line.markdown
index 4889e27626d4..f3d3bd6ce56a 100644
--- a/docs/misc/xen-command-line.markdown
+++ b/docs/misc/xen-command-line.markdown
@@ -242,7 +242,7 @@ the NMI watchdog is also enabled.
 
 > Default: `0` (1/32 of RAM)
 
-Amount of RAM to set aside for the Xenheap.
+Amount of RAM to set aside for the Xenheap. Must be an integer multiple of 32.
 
 By default will use 1/32 of the RAM up to a maximum of 1GB and with a
 minimum of 32M, subject to a suitably aligned and sized contiguous
-- 
1.9.1


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