linux-kernel - Re: [PATCH][next] pwm: cros-ec: Avoid -Wflex-array-member-not-at-end warnings

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Message-ID: <aJxhNNqt9PTtZKaW@google.com>
Date: Wed, 13 Aug 2025 09:56:04 +0000
From: Tzung-Bi Shih <tzungbi@...nel.org>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Uwe Kleine-König <ukleinek@...nel.org>,
	Benson Leung <bleung@...omium.org>,
	Guenter Roeck <groeck@...omium.org>, linux-pwm@...r.kernel.org,
	chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] pwm: cros-ec: Avoid -Wflex-array-member-not-at-end
 warnings

On Tue, Aug 12, 2025 at 11:35:41PM +0900, 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 new TRAILING_OVERLAP() helper to fix the following warnings:
> 
> drivers/pwm/pwm-cros-ec.c:53:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/pwm/pwm-cros-ec.c:87:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> 
> This helper creates a union between a flexible-array member (FAM)
> and a set of members that would otherwise follow it. This overlays
> the trailing members onto the FAM while preserving the original
> memory layout.
> 
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Reviewed-by: Tzung-Bi Shih <tzungbi@...nel.org>