xen/balloon: make the balloon wait interruptible
commit 88a479ff6e
upstream.
So it can be killed, or else processes can get hung indefinitely
waiting for balloon pages.
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20200727091342.52325-3-roger.pau@citrix.com
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
parent
ee4c180d93
commit
8e41ac0bfd
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@ -570,11 +570,13 @@ static int add_ballooned_pages(int nr_pages)
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if (xen_hotplug_unpopulated) {
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st = reserve_additional_memory();
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if (st != BP_ECANCELED) {
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int rc;
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mutex_unlock(&balloon_mutex);
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wait_event(balloon_wq,
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rc = wait_event_interruptible(balloon_wq,
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!list_empty(&ballooned_pages));
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mutex_lock(&balloon_mutex);
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return 0;
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return rc ? -ENOMEM : 0;
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}
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}
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