[Xen-changelog] [xen master] xen: arm: Document xenheap_megabytes limitation

[patchbot@xxxxxxx]

commit a7da1081d1ee403464ce1f4fbda5c084cfb868df
Author:     Chris (Christopher) Brand <chris.brand@xxxxxxxxxxxx>
AuthorDate: Thu Jul 23 16:31:56 2015 +0000
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Fri Jul 24 11:16:11 2015 +0100

    xen: arm: Document xenheap_megabytes limitation
    
    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>
    Reviewed-by: Julien Grall <julien.grall@xxxxxxxxxx>
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 docs/misc/xen-command-line.markdown |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/docs/misc/xen-command-line.markdown 
b/docs/misc/xen-command-line.markdown
index 70d7ab8..a1bca2b 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
--
generated by git-patchbot for /home/xen/git/xen.git#master

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