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Message-ID: <20200723084523.42109-3-roger.pau@citrix.com>
Date: Thu, 23 Jul 2020 10:45:22 +0200
From: Roger Pau Monne <roger.pau@...rix.com>
To: <linux-kernel@...r.kernel.org>
CC: Roger Pau Monne <roger.pau@...rix.com>, <stable@...r.kernel.org>,
"Boris Ostrovsky" <boris.ostrovsky@...cle.com>,
Juergen Gross <jgross@...e.com>,
Stefano Stabellini <sstabellini@...nel.org>,
<xen-devel@...ts.xenproject.org>
Subject: [PATCH 2/3] xen/balloon: make the balloon wait interruptible
So it can be killed, or else processes can get hung indefinitely
waiting for balloon pages.
Signed-off-by: Roger Pau Monné <roger.pau@...rix.com>
Cc: stable@...r.kernel.org
---
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc: Juergen Gross <jgross@...e.com>
Cc: Stefano Stabellini <sstabellini@...nel.org>
Cc: xen-devel@...ts.xenproject.org
---
drivers/xen/balloon.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index 3cb10ed32557..292413b27575 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -568,11 +568,13 @@ static int add_ballooned_pages(int nr_pages)
if (xen_hotplug_unpopulated) {
st = reserve_additional_memory();
if (st != BP_ECANCELED) {
+ int rc;
+
mutex_unlock(&balloon_mutex);
- wait_event(balloon_wq,
+ rc = wait_event_interruptible(balloon_wq,
!list_empty(&ballooned_pages));
mutex_lock(&balloon_mutex);
- return 0;
+ return rc ? -ENOMEM : 0;
}
}
--
2.27.0
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