[Xen-changelog] [BALLOON] Do not allow target to be set below two percent of maximum

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 79d74ce206bbd4a4bfc5fa4890b442522da03223
# Parent  1449c0f57b9dc55c85732401bce24a3cdc54ddbd
[BALLOON] Do not allow target to be set below two percent of maximum
memory size.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
 linux-2.6-xen-sparse/drivers/xen/balloon/balloon.c |    6 ++++++
 1 files changed, 6 insertions(+)

diff -r 1449c0f57b9d -r 79d74ce206bb 
linux-2.6-xen-sparse/drivers/xen/balloon/balloon.c
--- a/linux-2.6-xen-sparse/drivers/xen/balloon/balloon.c        Thu May 25 
14:47:23 2006 +0100
+++ b/linux-2.6-xen-sparse/drivers/xen/balloon/balloon.c        Thu May 25 
14:54:43 2006 +0100
@@ -360,6 +360,12 @@ static void balloon_process(void *unused
 /* Resets the Xen limit, sets new target, and kicks off processing. */
 static void set_new_target(unsigned long target)
 {
+       unsigned long min_target;
+
+       /* Do not allow target to reduce below 2% of maximum memory size. */
+       min_target = max_pfn / 50;
+       target = max(target, min_target);
+
        /* No need for lock. Not read-modify-write updates. */
        hard_limit   = ~0UL;
        target_pages = target;

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