Commit b0f1e796 authored Sep 11, 2008 by David S. Miller

sparc64: Define WANT_PAGE_VIRTUAL



As sparse warns, without this struct page pointer subtraction is
extremely expensive, and this is a pretty common operation in
fast paths.

With this define struct page becomes 64 bytes which makes for a
simple subtract and shift, instead of a costly divide or reciprocol
multiply.

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

parent 17f04fbb

arch/sparc/include/asm/page_64.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -38,6 +38,8 @@

		#ifndef __ASSEMBLY__

		#define WANT_PAGE_VIRTUAL

		extern void _clear_page(void *page);
		#define clear_page(X) _clear_page((void *)(X))
		struct page;