linux-kernel - [PATCH] firewire: firewire-cdev.h: Avoid the use of one-element array

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Date:   Thu, 30 Jul 2020 11:27:00 +0800
From:   Qianli Zhao <zhaoqianligood@...il.com>
To:     stefanr@...6.in-berlin.de, linux1394-devel@...ts.sourceforge.net
Cc:     linux-kernel@...r.kernel.org, gustavo@...eddedor.com,
        zhaoqianli@...omi.com
Subject: [PATCH] firewire: firewire-cdev.h: Avoid the use of one-element array

From: Qianli Zhao <zhaoqianli@...omi.com>

There is a regular need in the kernel to provide a way to declare having a
dynamically sized set of trailing elements in a structure. Kernel code should
always use “flexible array members”[1] for these cases. The older style of
one-element or zero-length arrays should no longer be used[2].

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://github.com/KSPP/linux/issues/21

Signed-off-by: Qianli Zhao <zhaoqianli@...omi.com>
---
 include/uapi/linux/firewire-cdev.h | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/uapi/linux/firewire-cdev.h b/include/uapi/linux/firewire-cdev.h
index 7e5b5c1..487de87f 100644
--- a/include/uapi/linux/firewire-cdev.h
+++ b/include/uapi/linux/firewire-cdev.h
@@ -118,7 +118,7 @@ struct fw_cdev_event_response {
 	__u32 type;
 	__u32 rcode;
 	__u32 length;
-	__u32 data[0];
+	__u32 data[];
 };
 
 /**
@@ -142,7 +142,7 @@ struct fw_cdev_event_request {
 	__u64 offset;
 	__u32 handle;
 	__u32 length;
-	__u32 data[0];
+	__u32 data[];
 };
 
 /**
@@ -205,7 +205,7 @@ struct fw_cdev_event_request2 {
 	__u32 generation;
 	__u32 handle;
 	__u32 length;
-	__u32 data[0];
+	__u32 data[];
 };
 
 /**
@@ -344,7 +344,7 @@ struct fw_cdev_event_iso_resource {
  * @data:	Incoming data
  *
  * If @type is %FW_CDEV_EVENT_PHY_PACKET_SENT, @length is 0 and @data empty,
- * except in case of a ping packet:  Then, @length is 4, and @data[0] is the
+ * except in case of a ping packet:  Then, @length is 4, and @data[] is the
  * ping time in 49.152MHz clocks if @rcode is %RCODE_COMPLETE.
  *
  * If @type is %FW_CDEV_EVENT_PHY_PACKET_RECEIVED, @length is 8 and @data
@@ -355,7 +355,7 @@ struct fw_cdev_event_phy_packet {
 	__u32 type;
 	__u32 rcode;
 	__u32 length;
-	__u32 data[0];
+	__u32 data[];
 };
 
 /**
-- 
2.7.4