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

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Message-ID: <20120802180051.GI4537@opensource.wolfsonmicro.com>
Date:	Thu, 2 Aug 2012 19:00:51 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Axel Lin <axel.lin@...il.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

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.
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