linux-kernel - Re: [03/17] is_vmalloc_addr(): Check if an address is within the vmalloc boundaries

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Date:	Tue, 18 Sep 2007 23:32:13 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Christoph Lameter <clameter@....com>
cc:	Christoph Hellwig <hch@....de>, Mel Gorman <mel@...net.ie>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	David Chinner <dgc@....com>, Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [03/17] is_vmalloc_addr(): Check if an address is within the
 vmalloc boundaries

On Tue, 18 Sep 2007, Christoph Lameter wrote:

> Index: linux-2.6/include/linux/mm.h
> ===================================================================
> --- linux-2.6.orig/include/linux/mm.h	2007-09-17 21:46:06.000000000 -0700
> +++ linux-2.6/include/linux/mm.h	2007-09-17 23:56:54.000000000 -0700
> @@ -1158,6 +1158,14 @@ static inline unsigned long vma_pages(st
>  	return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
>  }
>  
> +/* Determine if an address is within the vmalloc range */
> +static inline int is_vmalloc_addr(const void *x)
> +{
> +	unsigned long addr = (unsigned long)x;
> +
> +	return addr >= VMALLOC_START && addr < VMALLOC_END;
> +}

This breaks on i386 because VMALLOC_END is defined in terms of PKMAP_BASE 
in the CONFIG_HIGHMEM case.

This function should probably be in include/linux/vmalloc.h instead since 
all callers already include it anyway.
-
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