netdev - [PATCH] vhost: reduce stack usage in log

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Date:   Tue, 15 Sep 2020 02:08:09 +0800
From:   Li Wang <li.wang@...driver.com>
To:     <mst@...hat.com>, <jasowang@...hat.com>
CC:     <kvm@...r.kernel.org>, <virtualization@...ts.linux-foundation.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] vhost: reduce stack usage in log_used

Fix the warning: [-Werror=-Wframe-larger-than=]

drivers/vhost/vhost.c: In function log_used:
drivers/vhost/vhost.c:1906:1:
warning: the frame size of 1040 bytes is larger than 1024 bytes

Signed-off-by: Li Wang <li.wang@...driver.com>
---
 drivers/vhost/vhost.c | 2 +-
 drivers/vhost/vhost.h | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index b45519c..31837a5
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -1884,7 +1884,7 @@ static int log_write_hva(struct vhost_virtqueue *vq, u64 hva, u64 len)
 
 static int log_used(struct vhost_virtqueue *vq, u64 used_offset, u64 len)
 {
-	struct iovec iov[64];
+	struct iovec *iov = vq->log_iov;
 	int i, ret;
 
 	if (!vq->iotlb)
diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
index 9032d3c..5fe4b47
--- a/drivers/vhost/vhost.h
+++ b/drivers/vhost/vhost.h
@@ -123,6 +123,7 @@ struct vhost_virtqueue {
 	/* Log write descriptors */
 	void __user *log_base;
 	struct vhost_log *log;
+	struct iovec log_iov[64];
 
 	/* Ring endianness. Defaults to legacy native endianness.
 	 * Set to true when starting a modern virtio device. */
-- 
2.7.4