From b962716b459505a8d83aea313fea0abe76749f42 Mon Sep 17 00:00:00 2001 From: Hugh Dickins Date: Tue, 6 Jan 2009 14:39:41 -0800 Subject: mm: optimize get_scan_ratio for no swap Rik suggests a simplified get_scan_ratio() for !CONFIG_SWAP. Yes, the gcc optimizer gives us that, when nr_swap_pages is #defined as 0L. Move usual declaration to swapfile.c: it never belonged in page_alloc.c. Signed-off-by: Hugh Dickins Cc: Lee Schermerhorn Acked-by: Rik van Riel Cc: Nick Piggin Cc: KAMEZAWA Hiroyuki Cc: Robin Holt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/swap.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'include/linux') diff --git a/include/linux/swap.h b/include/linux/swap.h index c0d23ac710d5..3a31cc25bd2c 100644 --- a/include/linux/swap.h +++ b/include/linux/swap.h @@ -163,7 +163,6 @@ struct swap_list_t { /* linux/mm/page_alloc.c */ extern unsigned long totalram_pages; extern unsigned long totalreserve_pages; -extern long nr_swap_pages; extern unsigned int nr_free_buffer_pages(void); extern unsigned int nr_free_pagecache_pages(void); @@ -291,6 +290,7 @@ extern struct page *swapin_readahead(swp_entry_t, gfp_t, struct vm_area_struct *vma, unsigned long addr); /* linux/mm/swapfile.c */ +extern long nr_swap_pages; extern long total_swap_pages; extern void si_swapinfo(struct sysinfo *); extern swp_entry_t get_swap_page(void); @@ -331,7 +331,8 @@ static inline void disable_swap_token(void) #else /* CONFIG_SWAP */ -#define total_swap_pages 0 +#define nr_swap_pages 0L +#define total_swap_pages 0L #define total_swapcache_pages 0UL #define si_swapinfo(val) \ -- cgit v1.2.3-59-g8ed1b