From: "Gustavo A. R. Silva" <gustavoars@kernel.org>
To: Simon Horman <simon.horman@corigine.com>
Cc: Felix Fietkau <nbd@nbd.name>,
Lorenzo Bianconi <lorenzo@kernel.org>,
Ryder Lee <ryder.lee@mediatek.com>,
Shayne Chen <shayne.chen@mediatek.com>,
Sean Wang <sean.wang@mediatek.com>, Kalle Valo <kvalo@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>,
linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org,
linux-hardening@vger.kernel.org
Subject: Re: [PATCH][next] wifi: mt76: mt7921: Replace fake flex-arrays with flexible-array members
Date: Mon, 20 Mar 2023 13:26:49 -0600 [thread overview]
Message-ID: <ZBizeZ5DaBT5KKXN@work> (raw)
In-Reply-To: <ZBh0NhaNFnttWRz8@corigine.com>
On Mon, Mar 20, 2023 at 03:56:54PM +0100, Simon Horman wrote:
> > struct mt7921_asar_cl {
> > @@ -85,7 +85,7 @@ struct mt7921_asar_fg {
> > u8 rsvd;
> > u8 nr_flag;
> > u8 rsvd1;
> > - u8 flag[0];
> > + u8 flag[];
>
> I am curious to know why DECLARE_FLEX_ARRAY isn't used here.
In contrast to the other structs, there is no object of type struct
mt7921_asar_fg declared in a union:
91 struct mt7921_acpi_sar {
92 u8 ver;
93 union {
94 struct mt7921_asar_dyn *dyn;
95 struct mt7921_asar_dyn_v2 *dyn_v2;
96 };
97 union {
98 struct mt7921_asar_geo *geo;
99 struct mt7921_asar_geo_v2 *geo_v2;
100 };
101 struct mt7921_asar_cl *countrylist;
102 struct mt7921_asar_fg *fg;
103 };
The DECLARE_FLEX_ARRAY() helper was created to declare flex-array members
in unions or alone in structs[1].
--
Gustavo
[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays
next prev parent reply other threads:[~2023-03-20 19:33 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-17 20:56 [PATCH][next] wifi: mt76: mt7921: Replace fake flex-arrays with flexible-array members Gustavo A. R. Silva
2023-03-20 14:56 ` Simon Horman
2023-03-20 19:26 ` Gustavo A. R. Silva [this message]
2023-03-20 19:48 ` Simon Horman
2023-03-30 20:11 ` Gustavo A. R. Silva
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