linux-kernel - Re: mmu_notifier: reduce size of mm_struct if !CONFIG_MMU

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Date:	Thu, 31 Jan 2008 14:16:10 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Andrea Arcangeli <andrea@...ranet.com>
cc:	Robin Holt <holt@....com>, Avi Kivity <avi@...ranet.com>,
	Izik Eidus <izike@...ranet.com>,
	kvm-devel@...ts.sourceforge.net,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, steiner@....com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	daniel.blueman@...drics.com
Subject: Re: mmu_notifier: reduce size of mm_struct if !CONFIG_MMU_NOTIFIER

mmu_notifier: Reduce size of mm_struct if !CONFIG_MMU_NOTIFIER

Andrea and Peter had a concern about this.

Use an #ifdef to make the mmu_notifer_head structure empty if we have
no notifier. That allows the use of the structure in inline functions
(which allows parameter verification even if !CONFIG_MMU_NOTIFIER)

Signed-off-by: Christoph Lameter <clameter@....com>

---
 include/linux/mm_types.h |    2 ++
 1 file changed, 2 insertions(+)

Index: linux-2.6/include/linux/mm_types.h
===================================================================
--- linux-2.6.orig/include/linux/mm_types.h	2008-01-31 14:03:23.000000000 -0800
+++ linux-2.6/include/linux/mm_types.h	2008-01-31 14:03:38.000000000 -0800
@@ -154,7 +154,9 @@ struct vm_area_struct {
 };
 
 struct mmu_notifier_head {
+#ifdef CONFIG_MMU_NOTIFIER
 	struct hlist_head head;
+#endif
 };
 
 struct mm_struct {

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