linux-kernel - [PATCH] mm: Fix BUILD_BUG assertion in pmdp_clear_flush

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Date:	Mon, 19 Dec 2011 09:38:08 -0800
From:	David Daney <ddaney.cavm@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Paul Mundt <lethal@...ux-sh.org>
Cc:	linux-kernel@...r.kernel.org, David Rientjes <rientjes@...gle.com>,
	David Daney <david.daney@...ium.com>
Subject: [PATCH] mm: Fix BUILD_BUG assertion in pmdp_clear_flush_young()

From: David Daney <david.daney@...ium.com>

It has been reported that when building for sh:

    mm/pgtable-generic.c: In function 'pmdp_clear_flush_young':
    mm/pgtable-generic.c:76: error: call to '__build_bug_failed' declared with attribute error: BUILD_BUG failed

Adding some ugle #ifdeffery will probably fix this issue.

Signed-off-by: David Daney <david.daney@...ium.com>
---

This is completely untested, but may be the best fix for this.  Linus
and others have expressed a dislike for using BUG() to detect what
should be dead code paths at runtime, but it seems to be the state of
the art here.

 mm/pgtable-generic.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c
index eb663fb..73784c8 100644
--- a/mm/pgtable-generic.c
+++ b/mm/pgtable-generic.c
@@ -70,7 +70,7 @@ int pmdp_clear_flush_young(struct vm_area_struct *vma,
 			   unsigned long address, pmd_t *pmdp)
 {
 	int young;
-#ifndef CONFIG_TRANSPARENT_HUGEPAGE
+#if !defined(CONFIG_HUGETLB_PAGE) || !defined(CONFIG_TRANSPARENT_HUGEPAGE)
 	BUG();
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
 	VM_BUG_ON(address & ~HPAGE_PMD_MASK);
-- 
1.7.2.3

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