linux-kernel - [PATCH 2/2] hugetlb: Replace BUG() with BUILD_BUG_ON

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Date:	Mon, 21 Nov 2011 17:31:06 -0800
From:	David Daney <ddaney.cavm@...il.com>
To:	ralf@...ux-mips.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	David Daney <david.daney@...ium.com>
Subject: [PATCH 2/2] hugetlb: Replace BUG() with BUILD_BUG_ON_USED() for dummy definitions.

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

The file linux/hugetlb.h has many places where dummy symbols were
defined so that the main source code would contain fewer:

    #ifdef CONFIG_HUGETLBFS

If there were any misuse of these symbols, the only symptom would be
an OOPS at runtime.  Change the BUG() to BUILD_BUG_ON_USED() to catch
any such abuse at compile time instead.

Signed-off-by: David Daney <david.daney@...ium.com>
---
 include/linux/hugetlb.h |   15 ++++++++-------
 1 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index d9d6c86..0067191 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -85,11 +85,11 @@ static inline unsigned long hugetlb_total_pages(void)
 	return 0;
 }
 
-#define follow_hugetlb_page(m,v,p,vs,a,b,i,w)	({ BUG(); 0; })
+#define follow_hugetlb_page(m,v,p,vs,a,b,i,w)	({ BUILD_BUG_ON_USED(); 0; })
 #define follow_huge_addr(mm, addr, write)	ERR_PTR(-EINVAL)
-#define copy_hugetlb_page_range(src, dst, vma)	({ BUG(); 0; })
-#define hugetlb_prefault(mapping, vma)		({ BUG(); 0; })
-#define unmap_hugepage_range(vma, start, end, page)	BUG()
+#define copy_hugetlb_page_range(src, dst, vma)	({ BUILD_BUG_ON_USED(); 0; })
+#define hugetlb_prefault(mapping, vma)		({ BUILD_BUG_ON_USED(); 0; })
+#define unmap_hugepage_range(vma, start, end, page)	BUILD_BUG_ON_USED()
 static inline void hugetlb_report_meminfo(struct seq_file *m)
 {
 }
@@ -100,8 +100,9 @@ static inline void hugetlb_report_meminfo(struct seq_file *m)
 #define pmd_huge(x)	0
 #define pud_huge(x)	0
 #define is_hugepage_only_range(mm, addr, len)	0
-#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
-#define hugetlb_fault(mm, vma, addr, flags)	({ BUG(); 0; })
+#define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling)	\
+	({BUILD_BUG_ON_USED(); 0; })
+#define hugetlb_fault(mm, vma, addr, flags)	({ BUILD_BUG_ON_USED(); 0; })
 #define huge_pte_offset(mm, address)	0
 #define dequeue_hwpoisoned_huge_page(page)	0
 static inline void copy_huge_page(struct page *dst, struct page *src)
@@ -186,7 +187,7 @@ static inline void set_file_hugepages(struct file *file)
 #else /* !CONFIG_HUGETLBFS */
 
 #define is_file_hugepages(file)			0
-#define set_file_hugepages(file)		BUG()
+#define set_file_hugepages(file)		BUILD_BUG_ON_USED()
 static inline struct file *hugetlb_file_setup(const char *name, size_t size,
 		vm_flags_t acctflag, struct user_struct **user, int creat_flags)
 {
-- 
1.7.2.3

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