linux-kernel - [PATCH v2 1/2] hugetlb: Provide a default HPAGE_SHIFT if !CONFIG_HUGETLB

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Date:	Thu, 17 Nov 2011 13:57:29 -0800
From:	David Daney <ddaney.cavm@...il.com>
To:	linux-mips@...ux-mips.org, ralf@...ux-mips.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Cc:	David Daney <david.daney@...ium.com>,
	David Rientjes <rientjes@...gle.com>
Subject: [PATCH v2 1/2] hugetlb: Provide a default HPAGE_SHIFT if !CONFIG_HUGETLB_PAGE

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

When linux-next 10111117 is build for MIPS with
cavium-octeon_defconfig, we get:

  arch/mips/mm/tlb-r4k.c: In function 'local_flush_tlb_range':
  arch/mips/mm/tlb-r4k.c:129:28: error: 'HPAGE_SHIFT' undeclared (first use in this function)

The fix is to supply a dummy HPAGE_SHIFT in the !CONFIG_HUGETLB_PAGE
case.  Instead of supplying the non-huge value, as was done for
HPAGE_MASK and HPAGE_SIZE, we do BUG() instead.  This satisfies the
compiler, but give us runtime safety if someone were to use HPAGE_SIZE
incorrectly.

Cc: David Rientjes <rientjes@...gle.com>
Signed-off-by: David Daney <david.daney@...ium.com>
---
 include/linux/hugetlb.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 19644e0..380451c 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -113,6 +113,7 @@ static inline void copy_huge_page(struct page *dst, struct page *src)
 #ifndef HPAGE_MASK
 #define HPAGE_MASK	PAGE_MASK		/* Keep the compiler happy */
 #define HPAGE_SIZE	PAGE_SIZE
+#define HPAGE_SHIFT	({BUG(); 0; })
 #endif
 
 #endif /* !CONFIG_HUGETLB_PAGE */
-- 
1.7.2.3

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