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Commit d78d0891 authored by David S. Miller's avatar David S. Miller
Browse files

[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: default avatarDavid S. Miller <davem@davemloft.net>
parent 43bed127

arch/sparc64/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -220,6 +220,7 @@ config ARCH_SPARSEMEM_ENABLE 


config ARCH_SPARSEMEM_DEFAULT

	def_bool y

	select SPARSEMEM_STATIC



config LARGE_ALLOCS

	def_bool y

include/asm-sparc64/sparsemem.h

+3 −3
Original line number Diff line number Diff line
@@ -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__) */