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Message-ID: <Z-WG6_uhWsy_FCq3@kspp>
Date: Thu, 27 Mar 2025 11:12:11 -0600
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Lukasz Majczak <lma@...omium.org>,
Wim Van Sebroeck <wim@...ux-watchdog.org>,
Guenter Roeck <linux@...ck-us.net>,
Benson Leung <bleung@...omium.org>,
Tzung-Bi Shih <tzungbi@...nel.org>
Cc: chrome-platform@...ts.linux.dev, linux-watchdog@...r.kernel.org,
linux-kernel@...r.kernel.org,
"Gustavo A. R. Silva" <gustavoars@...nel.org>,
linux-hardening@...r.kernel.org
Subject: [PATCH v2][next] watchdog: cros-ec: Avoid
-Wflex-array-member-not-at-end warning
-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 on-stack definitions 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/watchdog/cros_ec_wdt.c:29:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
Reviewed-by: Tzung-Bi Shih <tzungbi@...nel.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
Changes v2:
- Fix truncated line in changelog text. (Tzung-Bi)
- Update variable name: s/buf/msg (Tzung-Bi)
- Cast to structs instead of union. (Tzung-Bi)
- Add RB tag.
v1:
- Link: https://lore.kernel.org/linux-hardening/Z-SBITmMfwjocYwL@kspp/
drivers/watchdog/cros_ec_wdt.c | 30 +++++++++++++-----------------
1 file changed, 13 insertions(+), 17 deletions(-)
diff --git a/drivers/watchdog/cros_ec_wdt.c b/drivers/watchdog/cros_ec_wdt.c
index 716c23f4388c..9ffe7f505645 100644
--- a/drivers/watchdog/cros_ec_wdt.c
+++ b/drivers/watchdog/cros_ec_wdt.c
@@ -25,26 +25,22 @@ static int cros_ec_wdt_send_cmd(struct cros_ec_device *cros_ec,
union cros_ec_wdt_data *arg)
{
int ret;
- struct {
- struct cros_ec_command msg;
- union cros_ec_wdt_data data;
- } __packed buf = {
- .msg = {
- .version = 0,
- .command = EC_CMD_HANG_DETECT,
- .insize = (arg->req.command == EC_HANG_DETECT_CMD_GET_STATUS) ?
- sizeof(struct ec_response_hang_detect) :
- 0,
- .outsize = sizeof(struct ec_params_hang_detect),
- },
- .data.req = arg->req
- };
-
- ret = cros_ec_cmd_xfer_status(cros_ec, &buf.msg);
+ DEFINE_RAW_FLEX(struct cros_ec_command, msg, data,
+ sizeof(union cros_ec_wdt_data));
+
+ msg->version = 0;
+ msg->command = EC_CMD_HANG_DETECT;
+ msg->insize = (arg->req.command == EC_HANG_DETECT_CMD_GET_STATUS) ?
+ sizeof(struct ec_response_hang_detect) :
+ 0;
+ msg->outsize = sizeof(struct ec_params_hang_detect);
+ *(struct ec_params_hang_detect *)msg->data = arg->req;
+
+ ret = cros_ec_cmd_xfer_status(cros_ec, msg);
if (ret < 0)
return ret;
- arg->resp = buf.data.resp;
+ arg->resp = *(struct ec_response_hang_detect *)msg->data;
return 0;
}
--
2.43.0
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