linux-kernel - Re: [PATCH 01/32] Add an ERR_CAST() macro to complement ERR

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Message-Id: <20071005092129.8fae521d.randy.dunlap@oracle.com>
Date:	Fri, 5 Oct 2007 09:21:29 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	David Howells <dhowells@...hat.com>
Cc:	hch@...radead.org, viro@....linux.org.uk, torvalds@...l.org,
	akpm@...l.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 01/32] Add an ERR_CAST() macro to complement ERR_PTR and
 co. [try #2]

On Thu, 04 Oct 2007 16:56:07 +0100 David Howells wrote:

> Add an ERR_CAST() macro to complement ERR_PTR and co. for the purposes of
> casting an error entyped as one pointer type to an error of another pointer
> type whilst making it explicit as to what is going on.
> 
> This provides a replacement for the ERR_PTR(PTR_ERR(p)) construct.
> 
> Signed-off-by: David Howells <dhowells@...hat.com>
> ---
> 
>  include/linux/err.h |   12 ++++++++++++
>  1 files changed, 12 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/err.h b/include/linux/err.h
> index 1ab1d44..e810ca4 100644
> --- a/include/linux/err.h
> +++ b/include/linux/err.h
> @@ -34,6 +34,18 @@ static inline long IS_ERR(const void *ptr)
>  	return IS_ERR_VALUE((unsigned long)ptr);
>  }
>  
> +/**
> + * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
> + * ptr: The pointer to cast.

      @ptr:

> + *
> + * Explicitly cast an error-valued pointer to another pointer type in such a
> + * way as to make it clear that's what's going on.
> + */
> +static inline void *ERR_CAST(const void *ptr)
> +{
> +	return (void *) ptr;
> +}
> +
>  #endif
>  
>  #endif /* _LINUX_ERR_H */


---
~Randy
-
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