linux-kernel - [PATCH v2 0/6] Stop NULLifying match pointer in of_match

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Date:   Fri, 22 Jan 2021 19:44:22 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Rob Herring <robh@...nel.org>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Alexandre Torgue <alexandre.torgue@...com>,
        Arnd Bergmann <arnd@...db.de>,
        "David S. Miller" <davem@...emloft.net>,
        Frank Rowand <frowand.list@...il.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Guenter Roeck <linux@...ck-us.net>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Jean Delvare <jdelvare@...e.com>, Jiri Slaby <jslaby@...e.com>,
        linux-hwmon@...r.kernel.org, linux-media@...r.kernel.org,
        linux-omap@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-serial@...r.kernel.org, linux-usb@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Richard Leitner <richard.leitner@...data.com>,
        Rob Herring <robh+dt@...nel.org>
Subject: [PATCH v2 0/6]  Stop NULLifying match pointer in of_match_device()

(This is a continuation of this series[1] per Rob's request. I've picked
up the acks, etc. with b4 and compile tested the patches along with an
arm64 allmodconfig build. Presumably Rob will pick these up directly.)

of_match_device() uses of_match_ptr() to make the match table argument
NULL via the pre-processor when CONFIG_OF=n. This makes life harder for
compilers who think that match tables are never used and warn about
unused variables when CONFIG_OF=n. This series changes various callers
to use of_device_get_match_data() instead, which doesn't have this
problem, and removes the of_match_ptr() usage from of_match_device() so
that the compiler can stop complaining about unused variables. It will
do dead code elimination instead and remove the match table if it isn't
actually used.

[1] https://lore.kernel.org/r/20191004214334.149976-1-swboyd@chromium.org

Cc: Alexandre Torgue <alexandre.torgue@...com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Frank Rowand <frowand.list@...il.com>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Grygorii Strashko <grygorii.strashko@...com>
Cc: Guenter Roeck <linux@...ck-us.net>
Cc: Jacopo Mondi <jacopo@...ndi.org>
Cc: Jean Delvare <jdelvare@...e.com>
Cc: Jiri Slaby <jslaby@...e.com>
Cc: <linux-hwmon@...r.kernel.org>
Cc: <linux-kernel@...r.kernel.org>,
Cc: <linux-media@...r.kernel.org>
Cc: <linux-omap@...r.kernel.org>
Cc: <linux-renesas-soc@...r.kernel.org>
Cc: <linux-serial@...r.kernel.org>
Cc: <linux-usb@...r.kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: Maxime Coquelin <mcoquelin.stm32@...il.com>
Cc: Richard Leitner <richard.leitner@...data.com>
Cc: Rob Herring <robh+dt@...nel.org>

Stephen Boyd (6):
  media: renesas-ceu: Use of_device_get_match_data()
  drivers: net: davinci_mdio: Use of_device_get_match_data()
  serial: stm32: Use of_device_get_match_data()
  usb: usb251xb: Use of_device_get_match_data()
  hwmon: (lm70) Avoid undefined reference to match table
  of/device: Don't NULLify match table in of_match_device() with
    CONFIG_OF=n

 drivers/hwmon/lm70.c                   |  2 +-
 drivers/media/platform/renesas-ceu.c   |  2 +-
 drivers/net/ethernet/ti/davinci_mdio.c | 12 ++---
 drivers/tty/serial/stm32-usart.c       | 71 ++++++++++++--------------
 drivers/tty/serial/stm32-usart.h       |  2 +-
 drivers/usb/misc/usb251xb.c            | 12 ++---
 include/linux/of_device.h              |  4 +-
 7 files changed, 47 insertions(+), 58 deletions(-)

base-commit: 19c329f6808995b142b3966301f217c831e7cf31
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