linux-kernel - Re: [PATCH 3/5] clocksource/drivers/mtk_timer: add _

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Date:	Mon, 18 Apr 2016 17:51:41 +0200
From:	Matthias Brugger <matthias.bgg@...il.com>
To:	Julia Lawall <Julia.Lawall@...6.fr>,
	Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:	kernel-janitors@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	"Luis R . Rodriguez" <mcgrof@...nel.org>,
	Josh Triplett <josh@...htriplett.org>
Subject: Re: [PATCH 3/5] clocksource/drivers/mtk_timer: add __init attribute



On 18/04/16 16:55, Julia Lawall wrote:
> Add __init attribute on a function that is only called from other __init
> functions and that is not inlined, at least with gcc version 4.8.4 on an
> x86 machine with allyesconfig.  Currently, the function is put in the
> .text.unlikely segment.  Declaring it as __init will cause it to be put in
> the .init.text and to disappear after initialization.
>
> The result of objdump -x on the function before the change is as follows:
>
> 0000000000000000 l     F .text.unlikely 000000000000006f mtk_timer_setup.isra.4
>
> And after the change it is as follows:
>
> 0000000000000000 l     F .init.text	000000000000006a mtk_timer_setup.isra.4
>
> Done with the help of Coccinelle.  The semantic patch checks for local
> static non-init functions that are called from an __init function and are
> not called from any other function.
>
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
>

Acked-by: Matthias Brugger <matthias.bgg@...il.com>

> ---
>   drivers/clocksource/mtk_timer.c |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/clocksource/mtk_timer.c b/drivers/clocksource/mtk_timer.c
> index d67bc35..7e583f8 100644
> --- a/drivers/clocksource/mtk_timer.c
> +++ b/drivers/clocksource/mtk_timer.c
> @@ -152,7 +152,7 @@ static irqreturn_t mtk_timer_interrupt(int irq, void *dev_id)
>   }
>
>   static void
> -mtk_timer_setup(struct mtk_clock_event_device *evt, u8 timer, u8 option)
> +__init mtk_timer_setup(struct mtk_clock_event_device *evt, u8 timer, u8 option)
>   {
>   	writel(TIMER_CTRL_CLEAR | TIMER_CTRL_DISABLE,
>   		evt->gpt_base + TIMER_CTRL_REG(timer));
>