commit d78d0891d3dd976a2fb707c6c691d9cd5ed60727
author David S. Miller <davem@sunset.davemloft.net> Wed Mar 14 22:47:01 2007 -0700
committer David S. Miller <davem@sunset.davemloft.net> Thu Apr 26 01:55:22 2007 -0700
tree 75a1f09a7f316c5cfd6ab3d1dc0e48e89320a200
parent 43bed127376ff2ef9c268cf6688a43d0fbed2ff4

[SPARC64]: Use SPARSEMEM_STATIC

Decrease the SECTION_SIZE_BITS --> MAX_PHYSADDR_BITS
range a little bit.

The cost of going to SPARSEMEM_STATIC becomes 8K of BSS space, and in
return we save a pointer dereferences on every page struct lookup.
Even better we hit the main kernel image for the base address which is
in a hugepage locked TLB entry.

Signed-off-by: David S. Miller <davem@davemloft.net>

include/asm-sparc64/sparsemem.h

diff --git a/include/asm-sparc64/sparsemem.h b/include/asm-sparc64/sparsemem.h
index ed5c9d8..411e0e2 100644
--- a/include/asm-sparc64/sparsemem.h
+++ b/include/asm-sparc64/sparsemem.h
@@ -3,9 +3,9 @@
 
 #ifdef __KERNEL__
 
-#define SECTION_SIZE_BITS       26
-#define MAX_PHYSADDR_BITS       42
-#define MAX_PHYSMEM_BITS        42
+#define SECTION_SIZE_BITS       31
+#define MAX_PHYSADDR_BITS       41
+#define MAX_PHYSMEM_BITS        41
 
 #endif /* !(__KERNEL__) */