linux-kernel - Re: [PATCH] clk: use ULONG_MAX as the initial value for the iteration in clk_mux_determine_rate

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Date:   Mon, 24 Apr 2023 18:24:44 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Michael Turquette <mturquette@...libre.com>,
        Yang Xiwen via B4 Relay 
        <devnull+forbidden405.outlook.com@...nel.org>,
        forbidden405@...look.com
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yang Xiwen <forbidden405@...look.com>
Subject: Re: [PATCH] clk: use ULONG_MAX as the initial value for the iteration in clk_mux_determine_rate_flags()

Quoting Yang Xiwen via B4 Relay (2023-04-21 08:56:38)
> From: Yang Xiwen <forbidden405@...look.com>
> 
> Currently, clk_mux_determine_rate_flags() use 0 as the initial value for
> selecting the best matching parent. However, this will choose a
> non-existant rate(0) if the requested rate is closer to 0 than the
> minimum rate the parents have.
> 
> Fix that by initializing the initial value to ULONG_MAX and treat it as a
> magic number.

Can you add a unit test to clk_test.c as well?