linux-kernel - [PATCH] powerpc/mm: Export HPAGE

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Message-ID: <20090203164930.GA10101@mtls03>
Date:	Tue, 3 Feb 2009 18:49:30 +0200
From:	Eli Cohen <eli@...lanox.co.il>
To:	linux-kernel@...r.kernel.org, Roland Dreier <rdreier@...co.com>
Subject: [PATCH] powerpc/mm: Export HPAGE_SHIFT

Drivers may want to take advantage of the large pages used for memory obtained
from hugetlbfs. One example is mlx4_ib which can use much less MTT entries (in
the order of HPAGE_SIZE / PAGE_SIZE) when registering such memory, thus scale
significantly better when registering larger memory regions. Other drivers
could also benefit from this.

Signed-off-by: Eli Cohen <eli@...lanox.co.il>
---
 arch/powerpc/mm/hash_utils_64.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 8d5b475..6cff8c7 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -104,6 +104,7 @@ int mmu_highuser_ssize = MMU_SEGSIZE_256M;
 u16 mmu_slb_size = 64;
 #ifdef CONFIG_HUGETLB_PAGE
 unsigned int HPAGE_SHIFT;
+EXPORT_SYMBOL(HPAGE_SHIFT);
 #endif
 #ifdef CONFIG_PPC_64K_PAGES
 int mmu_ci_restrictions;
-- 
1.6.1

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