linux-kernel - Re: [powerpc] Fix bogus BUG_ON() in in hugetlb_get_unmapped

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Date:	Fri, 22 Dec 2006 01:31:26 +0100
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	David Gibson <david@...son.dropbear.id.au>
Cc:	Andrew Morton <akpm@...l.org>, Paul Mackerras <paulus@...ba.org>,
	libhugetlbfs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org,
	William Lee Irwin <wli@...omorphy.com>,
	linuxppc-dev@...abs.org
Subject: Re: [powerpc] Fix bogus BUG_ON() in in hugetlb_get_unmapped_area()

> +	if (len > TASK_SIZE)
> +		return -ENOMEM;

Shouldn't that be addr+len instead?  The check looks incomplete
otherwise.  And you meant ">=" I guess?

> -		/* Paranoia, caller should have dealt with this */
> -		BUG_ON((addr + len) > 0x100000000UL);
> -

Any real reason to remove the paranoia check?  If it's trivially
always satisfied, the compiler will get rid of it for you :-)

Cheers,


Segher

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