From: David Miller <davem@davemloft.net>
To: brgl@bgdev.pl
Cc: edwin.peer@broadcom.com, devicetree@vger.kernel.org,
stephane.leprovost@mediatek.com, arnd@arndb.de,
bgolaszewski@baylibre.com, netdev@vger.kernel.org,
sean.wang@mediatek.com, linux-kernel@vger.kernel.org,
pedro.tsai@mediatek.com, fparent@baylibre.com,
robh+dt@kernel.org, linux-mediatek@lists.infradead.org,
andrew.perepech@mediatek.com, john@phrozen.org,
matthias.bgg@gmail.com, kuba@kernel.org,
Mark-MC.Lee@mediatek.com, linux-arm-kernel@lists.infradead.org,
hkallweit1@gmail.com
Subject: Re: [PATCH v2 05/14] net: core: provide priv_to_netdev()
Date: Mon, 11 May 2020 13:41:17 -0700 (PDT) [thread overview]
Message-ID: <20200511.134117.1336222619714836904.davem@davemloft.net> (raw)
In-Reply-To: <20200511150759.18766-6-brgl@bgdev.pl>
From: Bartosz Golaszewski <brgl@bgdev.pl>
Date: Mon, 11 May 2020 17:07:50 +0200
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>
> Appropriate amount of extra memory for private data is allocated at
> the end of struct net_device. We have a helper - netdev_priv() - that
> returns its address but we don't have the reverse: a function which
> given the address of the private data, returns the address of struct
> net_device.
>
> This has caused many drivers to store the pointer to net_device in
> the private data structure, which basically means storing the pointer
> to a structure in this very structure.
>
> This patch proposes to add priv_to_netdev() - a helper which converts
> the address of the private data to the address of the associated
> net_device.
>
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Sorry, please don't do this. We had this almost two decades ago and
explicitly removed it intentionally.
Store the back pointer in your software state just like everyone else
does.
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next prev parent reply other threads:[~2020-05-11 20:41 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-11 15:07 [PATCH v2 00/14] mediatek: add support for MediaTek Ethernet MAC Bartosz Golaszewski
2020-05-11 15:07 ` [PATCH v2 01/14] dt-bindings: arm: add a binding document for MediaTek PERICFG controller Bartosz Golaszewski
2020-05-19 18:28 ` Rob Herring
2020-05-20 9:19 ` Bartosz Golaszewski
2020-05-11 15:07 ` [PATCH v2 02/14] dt-bindings: net: add a binding document for MediaTek Ethernet MAC Bartosz Golaszewski
2020-05-11 15:07 ` [PATCH v2 03/14] net: ethernet: mediatek: rename Kconfig prompt Bartosz Golaszewski
2020-05-11 15:07 ` [PATCH v2 04/14] net: ethernet: mediatek: remove unnecessary spaces from Makefile Bartosz Golaszewski
2020-05-11 15:07 ` [PATCH v2 05/14] net: core: provide priv_to_netdev() Bartosz Golaszewski
2020-05-11 16:39 ` Andrew Lunn
2020-05-11 20:41 ` David Miller [this message]
2020-05-12 6:04 ` Bartosz Golaszewski
2020-05-12 19:30 ` David Miller
2020-05-11 15:07 ` [PATCH v2 06/14] net: move devres helpers into a separate source file Bartosz Golaszewski
2020-05-11 15:07 ` [PATCH v2 07/14] net: devres: define a separate devres structure for devm_alloc_etherdev() Bartosz Golaszewski
2020-05-11 15:07 ` [PATCH v2 08/14] net: devres: provide devm_register_netdev() Bartosz Golaszewski
2020-05-11 15:07 ` [PATCH v2 09/14] net: ethernet: mtk-eth-mac: new driver Bartosz Golaszewski
2020-05-11 19:24 ` Florian Fainelli
2020-05-12 6:35 ` Bartosz Golaszewski
2020-05-11 15:07 ` [PATCH v2 10/14] ARM64: dts: mediatek: add pericfg syscon to mt8516.dtsi Bartosz Golaszewski
2020-05-11 15:07 ` [PATCH v2 11/14] ARM64: dts: mediatek: add the ethernet node " Bartosz Golaszewski
2020-05-11 15:07 ` [PATCH v2 12/14] ARM64: dts: mediatek: add an alias for ethernet0 for pumpkin boards Bartosz Golaszewski
2020-05-11 15:07 ` [PATCH v2 13/14] ARM64: dts: mediatek: add ethernet pins " Bartosz Golaszewski
2020-05-11 15:07 ` [PATCH v2 14/14] ARM64: dts: mediatek: enable ethernet on " Bartosz Golaszewski
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