linux-kernel - Re: [PATCH -V3 3/8] hugetlb: add charge/uncharge calls for HugeTLB alloc/free

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Message-Id: <20120313143654.5dd1243d.akpm@linux-foundation.org>
Date:	Tue, 13 Mar 2012 14:36:54 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	linux-mm@...ck.org, mgorman@...e.de,
	kamezawa.hiroyu@...fujitsu.com, dhillf@...il.com,
	aarcange@...hat.com, mhocko@...e.cz, hannes@...xchg.org,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [PATCH -V3 3/8] hugetlb: add charge/uncharge calls for HugeTLB
 alloc/free

On Tue, 13 Mar 2012 12:37:07 +0530
"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com> wrote:

> +		return ERR_PTR(-VM_FAULT_SIGBUS);

whee, so we have (ab)used the err.h infrastructure to carry
VM_FAULT_foo codes, thus creating a secret requirement that the
VM_FAULT_foo values not exceed MAX_ERRNO.

What a hack, whodidthat?
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