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authorDavid S. Miller <davem@davemloft.net>2014-09-24 21:20:14 -0700
committerDavid S. Miller <davem@davemloft.net>2014-10-05 16:53:39 -0700
commitc06240c7f5c39c83dfd7849c0770775562441b96 (patch)
treece4deb5dadaea70c75d3f6680495055f16efb9c3 /arch/sparc/kernel
parent0dd5b7b09e13dae32869371e08e1048349fd040c (diff)
sparc64: Use kernel page tables for vmemmap.
For sparse memory configurations, the vmemmap array behaves terribly and it takes up an inordinate amount of space in the BSS section of the kernel image unconditionally. Just build huge PMDs and look them up just like we do for TLB misses in the vmalloc area. Kernel BSS shrinks by about 2MB. Signed-off-by: David S. Miller <davem@davemloft.net> Acked-by: Bob Picco <bob.picco@oracle.com>
Diffstat (limited to 'arch/sparc/kernel')
-rw-r--r--arch/sparc/kernel/ktlb.S9
1 files changed, 2 insertions, 7 deletions
diff --git a/arch/sparc/kernel/ktlb.S b/arch/sparc/kernel/ktlb.S
index 94a1e6648bd0..2627a7fa33d9 100644
--- a/arch/sparc/kernel/ktlb.S
+++ b/arch/sparc/kernel/ktlb.S
@@ -186,13 +186,8 @@ kvmap_dtlb_load:
#ifdef CONFIG_SPARSEMEM_VMEMMAP
kvmap_vmemmap:
- sub %g4, %g5, %g5
- srlx %g5, ILOG2_4MB, %g5
- sethi %hi(vmemmap_table), %g1
- sllx %g5, 3, %g5
- or %g1, %lo(vmemmap_table), %g1
- ba,pt %xcc, kvmap_dtlb_load
- ldx [%g1 + %g5], %g5
+ KERN_PGTABLE_WALK(%g4, %g5, %g2, kvmap_dtlb_longpath)
+ ba,a,pt %xcc, kvmap_dtlb_load
#endif
kvmap_dtlb_nonlinear: