linux-kernel - Re: [PATCH] regulator: core: Add intermediate cast to uintptr

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Date:	Mon, 6 Aug 2012 00:10:33 +0800
From:	Axel Lin <axel.lin@...il.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Liam Girdwood <lrg@...com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] regulator: core: Add intermediate cast to uintptr_t
 before casting to pointer

2012/8/3 Mark Brown <broonie@...nsource.wolfsonmicro.com>:
> On Wed, Aug 01, 2012 at 12:08:08AM +0800, Axel Lin wrote:
>> 於 二，2012-07-31 於 16:41 +0100，Mark Brown 提到：
>
>> > So the above cast probably isn't right...  you shouldn't need a double
>> > cast here.
>
>> The issue of original warning is: ( I compile the kernel on x86_64 )
>>         warning: cast to pointer from integer of different size
>
>> What this patch does is:
>> cast best_val to uintptr_t, which is an unsigned integer large enough to
>> hold a void* pointer.
>
>> And then cast it to (void *).
>
>> Thus I did (void *)(uintptr_t)best_val.
>
> Perhaps we need a temporary variable here.  The double cast just looks
> too horrible.

Either is ok to me.
But the double case looks better to me because the intention is clear.
It seems uintptr_t is less commonly used in drivers code.
Maybe just use (void *)(unsigned long)best_val is better in readability.
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