linux-kernel - Re: [PATCH 1/2] asm/sections: Add helpers to check for section data

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Message-Id: <20151105030221.68b7e98c.akpm@linux-foundation.org>
Date:	Thu, 5 Nov 2015 03:02:21 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Thierry Reding <thierry.reding@...il.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Joe Perches <joe@...ches.com>, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] asm/sections: Add helpers to check for section data

On Thu, 29 Oct 2015 09:26:06 +0100 Thierry Reding <thierry.reding@...il.com> wrote:

> From: Thierry Reding <treding@...dia.com>
> 
> Add a helper to check if an object (given an address and a size) is part
> of a section (given beginning and end addresses). For convenience, also
> provide a helper that performs this check for __init data using the
> __init_begin and __init_end limits.
> 
> ...
>
> --- a/include/asm-generic/sections.h
> +++ b/include/asm-generic/sections.h
> @@ -63,4 +63,15 @@ static inline int arch_is_kernel_data(unsigned long addr)
>  }
>  #endif
>  
> +static inline bool section_contains(void *virt, size_t size, void *begin,
> +				    void *end)
> +{
> +	return virt >= begin && virt + size <= end;
> +}

This is ambiguous: does it return true if the object is wholly within
the region, or if it is only partially within the region.  A code
comment will help.  Something like

/*
 * Return true if the region described by [virt, virt+size) is wholly contained
 * within the region described by [begin, end).
 */


Which makes me wonder whether this function should in fact do
"partially within".  Shrug, doesn't matter much I guess.


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