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swap_info: swap_map of chars not shorts

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Halve the vmalloc'ed swap_map array from unsigned shorts to unsigned
chars: it's still very unusual to reach a swap count of 126, and the
next patch allows it to be extended indefinitely.

Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2009-12-14 17:58:45 -08:00 • committed by Linus Torvalds
parent 253d553ba7
commit 8d69aaee80
2 changed files with 27 additions and 21 deletions
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8
include/linux/swap.h
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@ -151,9 +151,9 @@ enum {
#define SWAP_CLUSTER_MAX 32
#define SWAP_MAP_MAX 0x7ffe
#define SWAP_MAP_BAD 0x7fff
#define SWAP_HAS_CACHE 0x8000 /* There is a swap cache of entry. */
#define SWAP_MAP_MAX 0x7e
#define SWAP_MAP_BAD 0x7f
#define SWAP_HAS_CACHE 0x80 /* There is a swap cache of entry. */
/*
* The in-memory structure used to track swap areas.
@ -167,7 +167,7 @@ struct swap_info_struct {
struct block_device *bdev;
struct swap_extent first_swap_extent;
struct swap_extent *curr_swap_extent;
unsigned short *swap_map;
unsigned char *swap_map;
unsigned int lowest_bit;
unsigned int highest_bit;
unsigned int lowest_alloc; /* while preparing discard cluster */