From 56057e1a128a9aab516350500e5b154e70577929 Mon Sep 17 00:00:00 2001
From: Michal Schmidt <xschmi00@stud.feec.vutbr.cz>
Date: Sat, 3 Sep 2005 15:57:02 -0700
Subject: [PATCH] [PATCH] swsusp: simpler calculation of number of pages in PBE
list
The function calc_nr uses an iterative algorithm to calculate the number of
pages needed for the image and the pagedir. Exactly the same result can be
obtained with a one-line expression.
Note that this was even proved correct ;-).
Signed-off-by: Michal Schmidt <xschmi00@stud.feec.vutbr.cz>
Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
kernel/power/swsusp.c | 13 +------------
1 file changed, 1 insertion(+), 12 deletions(-)
diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c
index b041cea2e8781..1681e8a3fe514 100644
--- a/kernel/power/swsusp.c
+++ b/kernel/power/swsusp.c
@@ -737,18 +737,7 @@ static void copy_data_pages(void)
static int calc_nr(int nr_copy)
{
- int extra = 0;
- int mod = !!(nr_copy % PBES_PER_PAGE);
- int diff = (nr_copy / PBES_PER_PAGE) + mod;
-
- do {
- extra += diff;
- nr_copy += diff;
- mod = !!(nr_copy % PBES_PER_PAGE);
- diff = (nr_copy / PBES_PER_PAGE) + mod - extra;
- } while (diff > 0);
-
- return nr_copy;
+ return nr_copy + (nr_copy+PBES_PER_PAGE-2)/(PBES_PER_PAGE-1);
}
/**
--
2.30.2