[PATCH][next] platform/chrome: cros_ec_proto: avoid -Wflex-array-member-not-at-end warnings

[PATCH][next] platform/chrome: cros_ec_proto: avoid -Wflex-array-member-not-at-end warnings

[Gustavo A. R. Silva]

Use the `DEFINE_RAW_FLEX()` helper for an on-stack definition of
a flexible structure where the size of the flexible-array member
is known at compile-time, and refactor the rest of the code,
accordingly.

So, with these changes, fix the following warning:
drivers/platform/chrome/cros_ec_proto_test.c:1547:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
drivers/platform/chrome/cros_ec_proto_test.c:1607:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
drivers/platform/chrome/cros_ec_proto_test.c:1645:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
drivers/platform/chrome/cros_ec_proto_test.c:1668:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Link: https://github.com/KSPP/linux/issues/202
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
 drivers/platform/chrome/cros_ec_proto_test.c | 72 ++++++++------------
 1 file changed, 30 insertions(+), 42 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_proto_test.c b/drivers/platform/chrome/cros_ec_proto_test.c
index b6169d6f2467..41378c2ee6a0 100644
--- a/drivers/platform/chrome/cros_ec_proto_test.c
+++ b/drivers/platform/chrome/cros_ec_proto_test.c
@@ -1543,21 +1543,18 @@ static void cros_ec_proto_test_cmd_xfer_normal(struct kunit *test)
 	struct cros_ec_device *ec_dev = &priv->ec_dev;
 	struct ec_xfer_mock *mock;
 	int ret;
-	struct {
-		struct cros_ec_command msg;
-		u8 data[0x100];
-	} __packed buf;
+	DEFINE_RAW_FLEX(struct cros_ec_command, buf, data, 0x100);
 
 	ec_dev->max_request = 0xff;
 	ec_dev->max_response = 0xee;
 	ec_dev->max_passthru = 0xdd;
 
-	buf.msg.version = 0;
-	buf.msg.command = EC_CMD_HELLO;
-	buf.msg.insize = 4;
-	buf.msg.outsize = 2;
-	buf.data[0] = 0x55;
-	buf.data[1] = 0xaa;
+	buf->version = 0;
+	buf->command = EC_CMD_HELLO;
+	buf->insize = 4;
+	buf->outsize = 2;
+	buf->data[0] = 0x55;
+	buf->data[1] = 0xaa;
 
 	{
 		u8 *data;
@@ -1572,7 +1569,7 @@ static void cros_ec_proto_test_cmd_xfer_normal(struct kunit *test)
 		data[3] = 0x33;
 	}
 
-	ret = cros_ec_cmd_xfer(ec_dev, &buf.msg);
+	ret = cros_ec_cmd_xfer(ec_dev, buf);
 	KUNIT_EXPECT_EQ(test, ret, 4);
 
 	{
@@ -1590,10 +1587,10 @@ static void cros_ec_proto_test_cmd_xfer_normal(struct kunit *test)
 		KUNIT_EXPECT_EQ(test, data[0], 0x55);
 		KUNIT_EXPECT_EQ(test, data[1], 0xaa);
 
-		KUNIT_EXPECT_EQ(test, buf.data[0], 0xaa);
-		KUNIT_EXPECT_EQ(test, buf.data[1], 0x55);
-		KUNIT_EXPECT_EQ(test, buf.data[2], 0xcc);
-		KUNIT_EXPECT_EQ(test, buf.data[3], 0x33);
+		KUNIT_EXPECT_EQ(test, buf->data[0], 0xaa);
+		KUNIT_EXPECT_EQ(test, buf->data[1], 0x55);
+		KUNIT_EXPECT_EQ(test, buf->data[2], 0xcc);
+		KUNIT_EXPECT_EQ(test, buf->data[3], 0x33);
 	}
 }
 
@@ -1603,26 +1600,23 @@ static void cros_ec_proto_test_cmd_xfer_excess_msg_insize(struct kunit *test)
 	struct cros_ec_device *ec_dev = &priv->ec_dev;
 	struct ec_xfer_mock *mock;
 	int ret;
-	struct {
-		struct cros_ec_command msg;
-		u8 data[0x100];
-	} __packed buf;
+	DEFINE_RAW_FLEX(struct cros_ec_command, buf, data, 0x100);
 
 	ec_dev->max_request = 0xff;
 	ec_dev->max_response = 0xee;
 	ec_dev->max_passthru = 0xdd;
 
-	buf.msg.version = 0;
-	buf.msg.command = EC_CMD_HELLO;
-	buf.msg.insize = 0xee + 1;
-	buf.msg.outsize = 2;
+	buf->version = 0;
+	buf->command = EC_CMD_HELLO;
+	buf->insize = 0xee + 1;
+	buf->outsize = 2;
 
 	{
 		mock = cros_kunit_ec_xfer_mock_add(test, 0xcc);
 		KUNIT_ASSERT_PTR_NE(test, mock, NULL);
 	}
 
-	ret = cros_ec_cmd_xfer(ec_dev, &buf.msg);
+	ret = cros_ec_cmd_xfer(ec_dev, buf);
 	KUNIT_EXPECT_EQ(test, ret, 0xcc);
 
 	{
@@ -1641,21 +1635,18 @@ static void cros_ec_proto_test_cmd_xfer_excess_msg_outsize_without_passthru(stru
 	struct cros_ec_proto_test_priv *priv = test->priv;
 	struct cros_ec_device *ec_dev = &priv->ec_dev;
 	int ret;
-	struct {
-		struct cros_ec_command msg;
-		u8 data[0x100];
-	} __packed buf;
+	DEFINE_RAW_FLEX(struct cros_ec_command, buf, data, 0x100);
 
 	ec_dev->max_request = 0xff;
 	ec_dev->max_response = 0xee;
 	ec_dev->max_passthru = 0xdd;
 
-	buf.msg.version = 0;
-	buf.msg.command = EC_CMD_HELLO;
-	buf.msg.insize = 4;
-	buf.msg.outsize = 0xff + 1;
+	buf->version = 0;
+	buf->command = EC_CMD_HELLO;
+	buf->insize = 4;
+	buf->outsize = 0xff + 1;
 
-	ret = cros_ec_cmd_xfer(ec_dev, &buf.msg);
+	ret = cros_ec_cmd_xfer(ec_dev, buf);
 	KUNIT_EXPECT_EQ(test, ret, -EMSGSIZE);
 }
 
@@ -1664,21 +1655,18 @@ static void cros_ec_proto_test_cmd_xfer_excess_msg_outsize_with_passthru(struct
 	struct cros_ec_proto_test_priv *priv = test->priv;
 	struct cros_ec_device *ec_dev = &priv->ec_dev;
 	int ret;
-	struct {
-		struct cros_ec_command msg;
-		u8 data[0x100];
-	} __packed buf;
+	DEFINE_RAW_FLEX(struct cros_ec_command, buf, data, 0x100);
 
 	ec_dev->max_request = 0xff;
 	ec_dev->max_response = 0xee;
 	ec_dev->max_passthru = 0xdd;
 
-	buf.msg.version = 0;
-	buf.msg.command = EC_CMD_PASSTHRU_OFFSET(CROS_EC_DEV_PD_INDEX) + EC_CMD_HELLO;
-	buf.msg.insize = 4;
-	buf.msg.outsize = 0xdd + 1;
+	buf->version = 0;
+	buf->command = EC_CMD_PASSTHRU_OFFSET(CROS_EC_DEV_PD_INDEX) + EC_CMD_HELLO;
+	buf->insize = 4;
+	buf->outsize = 0xdd + 1;
 
-	ret = cros_ec_cmd_xfer(ec_dev, &buf.msg);
+	ret = cros_ec_cmd_xfer(ec_dev, buf);
 	KUNIT_EXPECT_EQ(test, ret, -EMSGSIZE);
 }
 
-- 
2.34.1

Re: [PATCH][next] platform/chrome: cros_ec_proto: avoid -Wflex-array-member-not-at-end warnings

[patchwork-bot+chrome-platform]

Hello:

This patch was applied to chrome-platform/linux.git (for-next)
by Tzung-Bi Shih <tzungbi@kernel.org>:

On Tue, 26 Mar 2024 12:55:10 -0600 you wrote:
> Use the `DEFINE_RAW_FLEX()` helper for an on-stack definition of
> a flexible structure where the size of the flexible-array member
> is known at compile-time, and refactor the rest of the code,
> accordingly.
> 
> So, with these changes, fix the following warning:
> drivers/platform/chrome/cros_ec_proto_test.c:1547:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/platform/chrome/cros_ec_proto_test.c:1607:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/platform/chrome/cros_ec_proto_test.c:1645:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/platform/chrome/cros_ec_proto_test.c:1668:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> 
> [...]

Here is the summary with links:
  - [next] platform/chrome: cros_ec_proto: avoid -Wflex-array-member-not-at-end warnings
    https://git.kernel.org/chrome-platform/c/6c85a13b133f

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

Re: [PATCH][next] platform/chrome: cros_ec_proto: avoid -Wflex-array-member-not-at-end warnings

[patchwork-bot+chrome-platform]

Hello:

This patch was applied to chrome-platform/linux.git (for-kernelci)
by Tzung-Bi Shih <tzungbi@kernel.org>:

On Tue, 26 Mar 2024 12:55:10 -0600 you wrote:
> Use the `DEFINE_RAW_FLEX()` helper for an on-stack definition of
> a flexible structure where the size of the flexible-array member
> is known at compile-time, and refactor the rest of the code,
> accordingly.
> 
> So, with these changes, fix the following warning:
> drivers/platform/chrome/cros_ec_proto_test.c:1547:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/platform/chrome/cros_ec_proto_test.c:1607:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/platform/chrome/cros_ec_proto_test.c:1645:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/platform/chrome/cros_ec_proto_test.c:1668:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> 
> [...]

Here is the summary with links:
  - [next] platform/chrome: cros_ec_proto: avoid -Wflex-array-member-not-at-end warnings
    https://git.kernel.org/chrome-platform/c/6c85a13b133f

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

[PATCH][next] platform/chrome: cros_ec_proto: Avoid -Wflex-array-member-not-at-end warnings

[Gustavo A. R. Silva]

-Wflex-array-member-not-at-end was introduced in GCC-14, and we are
getting ready to enable it, globally.

Use the `DEFINE_RAW_FLEX()` helper for an on-stack definition of
a flexible structure where the size of the flexible-array member
is known at compile-time, and refactor the rest of the code,
accordingly.

So, with these changes, fix the following warnings:

drivers/platform/chrome/cros_ec_proto.c:143:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
drivers/platform/chrome/cros_ec_proto.c:761:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
 drivers/platform/chrome/cros_ec_proto.c | 21 ++++++++-------------
 1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index 877b107fee4b..586358fbf981 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -139,12 +139,10 @@ static int cros_ec_xfer_command(struct cros_ec_device *ec_dev, struct cros_ec_co
 
 static int cros_ec_wait_until_complete(struct cros_ec_device *ec_dev, uint32_t *result)
 {
-	struct {
-		struct cros_ec_command msg;
-		struct ec_response_get_comms_status status;
-	} __packed buf;
-	struct cros_ec_command *msg = &buf.msg;
-	struct ec_response_get_comms_status *status = &buf.status;
+	DEFINE_RAW_FLEX(struct cros_ec_command, msg, data,
+			sizeof(struct ec_response_get_comms_status));
+	struct ec_response_get_comms_status *status =
+			(struct ec_response_get_comms_status *)msg->data;
 	int ret = 0, i;
 
 	msg->version = 0;
@@ -757,16 +755,13 @@ static int get_next_event_xfer(struct cros_ec_device *ec_dev,
 
 static int get_next_event(struct cros_ec_device *ec_dev)
 {
-	struct {
-		struct cros_ec_command msg;
-		struct ec_response_get_next_event_v3 event;
-	} __packed buf;
-	struct cros_ec_command *msg = &buf.msg;
-	struct ec_response_get_next_event_v3 *event = &buf.event;
+	DEFINE_RAW_FLEX(struct cros_ec_command, msg, data,
+			sizeof(struct ec_response_get_next_event_v3));
+	struct ec_response_get_next_event_v3 *event =
+			(struct ec_response_get_next_event_v3 *)msg->data;
 	int cmd_version = ec_dev->mkbp_event_supported - 1;
 	u32 size;
 
-	memset(msg, 0, sizeof(*msg));
 	if (ec_dev->suspended) {
 		dev_dbg(ec_dev->dev, "Device suspended.\n");
 		return -EHOSTDOWN;
-- 
2.43.0

Re: [PATCH][next] platform/chrome: cros_ec_proto: Avoid -Wflex-array-member-not-at-end warnings

[Tzung-Bi Shih]

On Fri, Mar 28, 2025 at 07:00:15AM -0600, Gustavo A. R. Silva wrote:
> -Wflex-array-member-not-at-end was introduced in GCC-14, and we are
> getting ready to enable it, globally.
> 
> Use the `DEFINE_RAW_FLEX()` helper for an on-stack definition of
> a flexible structure where the size of the flexible-array member
> is known at compile-time, and refactor the rest of the code,
> accordingly.
> 
> So, with these changes, fix the following warnings:
> 
> drivers/platform/chrome/cros_ec_proto.c:143:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/platform/chrome/cros_ec_proto.c:761:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> 
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

For my reference:
Reviewed-by: Tzung-Bi Shih <tzungbi@kernel.org>

Re: [PATCH][next] platform/chrome: cros_ec_proto: Avoid -Wflex-array-member-not-at-end warnings

[Tzung-Bi Shih]

On Fri, Mar 28, 2025 at 07:00:15AM -0600, Gustavo A. R. Silva wrote:
> -Wflex-array-member-not-at-end was introduced in GCC-14, and we are
> getting ready to enable it, globally.
> 
> Use the `DEFINE_RAW_FLEX()` helper for an on-stack definition of
> a flexible structure where the size of the flexible-array member
> is known at compile-time, and refactor the rest of the code,
> accordingly.
> 
> [...]

Applied to

    https://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux.git for-next

[1/1] platform/chrome: cros_ec_proto: Avoid -Wflex-array-member-not-at-end warnings
      commit: db4ea66acddf95b4bb13ef17537097820218fb7a

Thanks!