linux-kernel - [PATCH] pinctrl: Remove hole in pinctrl_gpio

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Date:   Wed, 28 Oct 2020 15:51:17 +0100
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Heiko Stuebner <heiko@...ech.de>, linux-gpio@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] pinctrl: Remove hole in pinctrl_gpio_range

On 64-bit platforms, pointer size and alignment are 64-bit, hence two
4-byte holes are present before the pins and gc members of the
pinctrl_gpio_range structure.  Get rid of these holes by moving the
pins pointer.

This reduces kernel size of an arm64 Rockchip kernel by ca. 512 bytes.

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
Compile-tested only (arm/multi_v7_defconfig and arm64/defconfig).
---
 include/linux/pinctrl/pinctrl.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/pinctrl/pinctrl.h b/include/linux/pinctrl/pinctrl.h
index 2aef59df93d70550..70b45d28e7a9293b 100644
--- a/include/linux/pinctrl/pinctrl.h
+++ b/include/linux/pinctrl/pinctrl.h
@@ -51,8 +51,8 @@ struct pinctrl_pin_desc {
  * @id: an ID number for the chip in this range
  * @base: base offset of the GPIO range
  * @pin_base: base pin number of the GPIO range if pins == NULL
- * @pins: enumeration of pins in GPIO range or NULL
  * @npins: number of pins in the GPIO range, including the base number
+ * @pins: enumeration of pins in GPIO range or NULL
  * @gc: an optional pointer to a gpio_chip
  */
 struct pinctrl_gpio_range {
@@ -61,8 +61,8 @@ struct pinctrl_gpio_range {
 	unsigned int id;
 	unsigned int base;
 	unsigned int pin_base;
-	unsigned const *pins;
 	unsigned int npins;
+	unsigned const *pins;
 	struct gpio_chip *gc;
 };
 
-- 
2.25.1