[PATCH] swap: swap unsigned int consistency
The swap header's unsigned int last_page determines the range of swap pages,
but swap_info has been using int or unsigned long in some cases: use unsigned
int throughout (except, in several places a local unsigned long is useful to
avoid overflows when adding).
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/linux/swap.h b/include/linux/swap.h
index f2b16ac..93f0eca 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -130,10 +130,10 @@
unsigned int highest_bit;
unsigned int cluster_next;
unsigned int cluster_nr;
+ unsigned int pages;
+ unsigned int max;
+ unsigned int inuse_pages;
int prio; /* swap priority */
- int pages;
- unsigned long max;
- unsigned long inuse_pages;
int next; /* next entry on swap list */
};
diff --git a/mm/swapfile.c b/mm/swapfile.c
index d4da84e..6cc6dfb 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -84,7 +84,7 @@
up_read(&swap_unplug_sem);
}
-static inline int scan_swap_map(struct swap_info_struct *si)
+static inline unsigned long scan_swap_map(struct swap_info_struct *si)
{
unsigned long offset;
/*
@@ -531,10 +531,11 @@
* Scan swap_map from current position to next entry still in use.
* Recycle to start on reaching the end, returning 0 when empty.
*/
-static int find_next_to_unuse(struct swap_info_struct *si, int prev)
+static unsigned int find_next_to_unuse(struct swap_info_struct *si,
+ unsigned int prev)
{
- int max = si->max;
- int i = prev;
+ unsigned int max = si->max;
+ unsigned int i = prev;
int count;
/*
@@ -577,7 +578,7 @@
unsigned short swcount;
struct page *page;
swp_entry_t entry;
- int i = 0;
+ unsigned int i = 0;
int retval = 0;
int reset_overflow = 0;
int shmem;
@@ -1216,7 +1217,7 @@
file = ptr->swap_file;
len = seq_path(swap, file->f_vfsmnt, file->f_dentry, " \t\n\\");
- seq_printf(swap, "%*s%s\t%d\t%ld\t%d\n",
+ seq_printf(swap, "%*s%s\t%u\t%u\t%d\n",
len < 40 ? 40 - len : 1, " ",
S_ISBLK(file->f_dentry->d_inode->i_mode) ?
"partition" : "file\t",
@@ -1275,8 +1276,8 @@
static int least_priority;
union swap_header *swap_header = NULL;
int swap_header_version;
- int nr_good_pages = 0;
- int nr_extents;
+ unsigned int nr_good_pages = 0;
+ int nr_extents = 0;
sector_t span;
unsigned long maxpages = 1;
int swapfilesize;
@@ -1509,7 +1510,7 @@
nr_swap_pages += nr_good_pages;
total_swap_pages += nr_good_pages;
- printk(KERN_INFO "Adding %dk swap on %s. "
+ printk(KERN_INFO "Adding %uk swap on %s. "
"Priority:%d extents:%d across:%lluk\n",
nr_good_pages<<(PAGE_SHIFT-10), name, p->prio,
nr_extents, (unsigned long long)span<<(PAGE_SHIFT-10));
