linux-kernel - Re: is

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Date:	Sun, 24 Jul 2016 15:17:51 +0200
From:	walter harms <wharms@....de>
To:	Julia Lawall <julia.lawall@...6.fr>
CC:	kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: is_err checking



Am 23.07.2016 16:56, schrieb Julia Lawall:
> Code like the following looks a bit clunky to me:
> 
> if (IS_ERR(data->clk) && PTR_ERR(data->clk) != -EPROBE_DEFER)
> 
> Is there any reason not to always use eg
> 
> data->clk == ERR_PTR(-EPROBE_DEFER)
> 
> Code of the latter form is a bit more popular.  Perhaps one could want
> something like:
> 
> IS_ERR_VALUE(data->clk, -EPROBE_DEFER)
> 
> but IS_ERR_VALUE is laready used for something else.
> 

note: i do not like hiding behind #defines

did you actually see code like IS_ERR_VALUE(data->clk, -EPROBE_DEFER)
in the current kernel ?
because there is no second argument:

#define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)

or is this a misunderstanding ?

re,
 wh

> julia
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