From 96253444dbd90c6e9e9cfcb25315da5c412b058a Mon Sep 17 00:00:00 2001 From: Sasha Levin Date: Sun, 10 Jun 2012 12:51:01 +0200 Subject: mm: frontswap: split out __frontswap_curr_pages Code was duplicated in two functions, clean it up. Also, assert that the deduplicated code runs under the swap spinlock. Reviewed-by: Minchan Kim Signed-off-by: Sasha Levin Signed-off-by: Konrad Rzeszutek Wilk --- mm/frontswap.c | 28 +++++++++++++++++----------- 1 file changed, 17 insertions(+), 11 deletions(-) (limited to 'mm/frontswap.c') diff --git a/mm/frontswap.c b/mm/frontswap.c index 7ec53d53c13a..5faf840f8726 100644 --- a/mm/frontswap.c +++ b/mm/frontswap.c @@ -216,6 +216,20 @@ void __frontswap_invalidate_area(unsigned type) } EXPORT_SYMBOL(__frontswap_invalidate_area); +static unsigned long __frontswap_curr_pages(void) +{ + int type; + unsigned long totalpages = 0; + struct swap_info_struct *si = NULL; + + assert_spin_locked(&swap_lock); + for (type = swap_list.head; type >= 0; type = si->next) { + si = swap_info[type]; + totalpages += atomic_read(&si->frontswap_pages); + } + return totalpages; +} + /* * Frontswap, like a true swap device, may unnecessarily retain pages * under certain circumstances; "shrink" frontswap is essentially a @@ -240,11 +254,7 @@ void frontswap_shrink(unsigned long target_pages) */ spin_lock(&swap_lock); locked = true; - total_pages = 0; - for (type = swap_list.head; type >= 0; type = si->next) { - si = swap_info[type]; - total_pages += atomic_read(&si->frontswap_pages); - } + total_pages = __frontswap_curr_pages(); if (total_pages <= target_pages) goto out; total_pages_to_unuse = total_pages - target_pages; @@ -282,16 +292,12 @@ EXPORT_SYMBOL(frontswap_shrink); */ unsigned long frontswap_curr_pages(void) { - int type; unsigned long totalpages = 0; - struct swap_info_struct *si = NULL; spin_lock(&swap_lock); - for (type = swap_list.head; type >= 0; type = si->next) { - si = swap_info[type]; - totalpages += atomic_read(&si->frontswap_pages); - } + totalpages = __frontswap_curr_pages(); spin_unlock(&swap_lock); + return totalpages; } EXPORT_SYMBOL(frontswap_curr_pages); -- cgit v1.2.3-59-g8ed1b