From b0f1e7962f93a78630161c7c9fc263de43c101ac Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Thu, 11 Sep 2008 23:36:32 -0700 Subject: [PATCH] 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 --- arch/sparc/include/asm/page_64.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/sparc/include/asm/page_64.h b/arch/sparc/include/asm/page_64.h index b579b910ef5..4274ed13ddb 100644 --- a/arch/sparc/include/asm/page_64.h +++ b/arch/sparc/include/asm/page_64.h @@ -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; -- 2.41.1