linux-kernel - Re: [PATCH] clk: sunxi-ng: fix recalc

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Message-ID: <20170320093355.wougjul675q3hru7@lukather>
Date:   Mon, 20 Mar 2017 10:33:55 +0100
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Icenowy Zheng <icenowy@...c.xyz>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Quentin Schulz <quentin.schulz@...e-electrons.com>,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH] clk: sunxi-ng: fix recalc_rate formula of NKMP clocks

On Sat, Mar 18, 2017 at 04:19:43AM +0800, Icenowy Zheng wrote:
> In commit e66f81bbd746 ("clk: sunxi-ng: Implement factors offsets"), the
> final formula of NKMP clocks' recalc_rate is refactored; however, the
> refactored formula broke the calculation due to some C language operand
> priority problem -- the priority of operand >> is lower than * and /,
> makes the formula being parsed as "(parent_rate * n * k) >> (p / m)", but
> it should be "(parent_rate * n * k >> p) / m".
> 
> Add the pair of parentheses to fix up this issue. This pair of
> parentheses used to exist in the old formula.
> 
> Fixes: commit e66f81bbd746 ("clk: sunxi-ng: Implement factors offsets")

You shouldn't have commit here.

> Signed-off-by: Icenowy Zheng <icenowy@...c.xyz>

Fixed it, and applied, thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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