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sparc64: Define WANT_PAGE_VIRTUAL

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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>
This commit is contained in:
David S. Miller 2008-09-11 23:36:32 -07:00
parent 17f04fbb0f
commit b0f1e7962f
1 changed files with 2 additions and 0 deletions
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2
arch/sparc/include/asm/page_64.h
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@ -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;