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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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