linux-kernel - [PATCH v2] rbd: Remove VLA usage

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Date:   Thu, 15 Mar 2018 21:32:43 -0700
From:   Kyle Spiers <kyle@...ers.me>
To:     idryomov@...il.com
Cc:     sage@...hat.com, elder@...nel.org, ceph-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org, keescook@...omium.org, me@...in.cc,
        Kyle Spiers <kyle@...ers.me>
Subject: [PATCH v2] rbd: Remove VLA usage

As part of the effort to remove VLAs from the kernel[1], this moves
the literal values into the stack array calculation instead of using a
variable for the sizing. The resulting size can be found from
sizeof(buf).

[1] https://lkml.org/lkml/2018/3/7/621

Signed-off-by: Kyle Spiers <kyle@...ers.me>
---
 drivers/block/rbd.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 8e40da0..0e94e1f 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -3100,8 +3100,8 @@ static int __rbd_notify_op_lock(struct rbd_device *rbd_dev,
 {
 	struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
 	struct rbd_client_id cid = rbd_get_cid(rbd_dev);
-	int buf_size = 4 + 8 + 8 + CEPH_ENCODING_START_BLK_LEN;
-	char buf[buf_size];
+	char buf[4 + 4 + 8 + 8 + CEPH_ENCODING_START_BLK_LEN];
+	int buf_size = sizeof(buf)
 	void *p = buf;
 
 	dout("%s rbd_dev %p notify_op %d\n", __func__, rbd_dev, notify_op);
@@ -3619,8 +3619,8 @@ static void __rbd_acknowledge_notify(struct rbd_device *rbd_dev,
 				     u64 notify_id, u64 cookie, s32 *result)
 {
 	struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
-	int buf_size = 4 + CEPH_ENCODING_START_BLK_LEN;
-	char buf[buf_size];
+	char buf[4 + CEPH_ENCODING_START_BLK_LEN];
+	int buf_size = sizeof(buf);
 	int ret;
 
 	if (result) {
-- 
2.7.4