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virtio: handle > 2 billion page balloon targets

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If the host asks for a huge target towards_target() can overflow, and
we up oops as we try to release more pages than we have.  The simple
fix is to use a 64-bit value.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2008-03-17 22:58:15 -05:00
parent c483934670
commit bdc1681cdf
1 changed files with 2 additions and 2 deletions
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4
drivers/virtio/virtio_balloon.c
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@ -152,7 +152,7 @@ static void virtballoon_changed(struct virtio_device *vdev)
wake_up(&vb->config_change);
}
static inline int towards_target(struct virtio_balloon *vb)
static inline s64 towards_target(struct virtio_balloon *vb)
{
u32 v;
__virtio_config_val(vb->vdev,
@ -176,7 +176,7 @@ static int balloon(void *_vballoon)
set_freezable();
while (!kthread_should_stop()) {
int diff;
s64 diff;
try_to_freeze();
wait_event_interruptible(vb->config_change,