linux-kernel - Re: [PATCH v4 2/9] clk: tegra: Add tegra specific clocks

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Message-ID: <20130117.070327.1625310713330263780.hdoyu@nvidia.com>
Date:	Thu, 17 Jan 2013 06:03:27 +0100
From:	Hiroshi Doyu <hdoyu@...dia.com>
To:	"swarren@...dotorg.org" <swarren@...dotorg.org>
CC:	Prashant Gaikwad <pgaikwad@...dia.com>,
	"mturquette@...aro.org" <mturquette@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 2/9] clk: tegra: Add tegra specific clocks

Stephen Warren <swarren@...dotorg.org> wrote @ Wed, 16 Jan 2013 21:11:24 +0100:

> >> +static int clk_frac_div_set_rate(struct clk_hw *hw, unsigned long rate,
> >> +                               unsigned long parent_rate)
> >> +{
> >> +       struct tegra_clk_frac_div *divider = to_clk_frac_div(hw);
> >> +       int div;
> >> +       unsigned long flags = 0;
> > 
> > nit, is "flags" not needed to initialize here?
> 
> It avoids a compiler warning; the compiler doesn't that the if condition
> that guards the path that uses flags is the same condition as the path
> that initializes it. Or, it may be related to the fact that
> spin_lock_irqsave() writes to the value through a pointer parameter, and
> the compiler doesn't know it's an out-only parameter.

It might be better to append the special comment /* GCC */[1] on that line.

[1] https://lwn.net/Articles/529954/
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