linux-kernel - Re: [PATCH][next] crypto: qat - Avoid -Wflex-array-member-not-at-end warnings

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Date: Tue, 2 Apr 2024 17:21:18 +0100
From: "Cabiddu, Giovanni" <giovanni.cabiddu@...el.com>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
CC: Herbert Xu <herbert@...dor.apana.org.au>, "David S. Miller"
	<davem@...emloft.net>, <qat-linux@...el.com>, <linux-crypto@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-hardening@...r.kernel.org>
Subject: Re: [PATCH][next] crypto: qat - Avoid -Wflex-array-member-not-at-end
 warnings

On Mon, Mar 25, 2024 at 02:44:55PM -0600, Gustavo A. R. Silva wrote:
> -Wflex-array-member-not-at-end is coming in GCC-14, and we are getting
> ready to enable it globally.
> 
> Use the `__struct_group()` helper to separate the flexible array
> from the rest of the members in flexible `struct qat_alg_buf_list`,
> through tagged `struct qat_alg_buf_list_hdr`, and avoid embedding the
> flexible-array member in the middle of `struct qat_alg_fixed_buf_list`.
> 
> Also, use `container_of()` whenever we need to retrieve a pointer to
> the flexible structure.
> 
> So, with these changes, fix the following warnings:
> drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
> drivers/crypto/intel/qat/qat_common/qat_bl.h:25:33: 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@...nel.org>
Acked-by: Giovanni Cabiddu <giovanni.cabiddu@...el.com>

Regards,

-- 
Giovanni