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authorBecky Bruce <beckyb@kernel.crashing.org>2011-06-28 09:54:48 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-09-20 09:19:40 +1000
commit41151e77a4d96ea138cede6d84c955aa4769ce74 (patch)
tree2d997b77b9adf406a2fd30326bff688577d2e64f /arch/powerpc/mm/hash_utils_64.c
parent7df5659eefad9b6d457ccdee016bd78bd064cfc0 (diff)
powerpc: Hugetlb for BookE
Enable hugepages on Freescale BookE processors. This allows the kernel to use huge TLB entries to map pages, which can greatly reduce the number of TLB misses and the amount of TLB thrashing experienced by applications with large memory footprints. Care should be taken when using this on FSL processors, as the number of large TLB entries supported by the core is low (16-64) on current processors. The supported set of hugepage sizes include 4m, 16m, 64m, 256m, and 1g. Page sizes larger than the max zone size are called "gigantic" pages and must be allocated on the command line (and cannot be deallocated). This is currently only fully implemented for Freescale 32-bit BookE processors, but there is some infrastructure in the code for 64-bit BooKE. Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm/hash_utils_64.c')
-rw-r--r--arch/powerpc/mm/hash_utils_64.c3
1 files changed, 0 insertions, 3 deletions
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 26b2872b3d00..1f8b2a05e3d0 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -105,9 +105,6 @@ int mmu_kernel_ssize = MMU_SEGSIZE_256M;
int mmu_highuser_ssize = MMU_SEGSIZE_256M;
u16 mmu_slb_size = 64;
EXPORT_SYMBOL_GPL(mmu_slb_size);
-#ifdef CONFIG_HUGETLB_PAGE
-unsigned int HPAGE_SHIFT;
-#endif
#ifdef CONFIG_PPC_64K_PAGES
int mmu_ci_restrictions;
#endif