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mm: frontswap: cleanup code

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After allowing tmem backends to build/run as modules, frontswap_enabled
always true if defined CONFIG_FRONTSWAP.  But frontswap_test() depends on
whether backend is registered, mv it into frontswap.c using fronstswap_ops
to make the decision.

frontswap_set/clear are not used outside frontswap, so don't export them.

Signed-off-by: Bob Liu <lliubbo@gmail.com>
Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Cc: Andor Daam <andor.daam@googlemail.com>
Cc: Dan Magenheimer <dan.magenheimer@oracle.com>
Cc: Florian Schmaus <fschmaus@gmail.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Stefan Hengelein <ilendir@googlemail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Bob Liu 2013-04-30 15:26:53 -07:00 • committed by Linus Torvalds
parent 1e01c968db
commit f066ea230a
2 changed files with 33 additions and 52 deletions
Download patch file Download diff file Expand all files Collapse all files

28
include/linux/frontswap.h
View file

@ -22,6 +22,7 @@ extern void frontswap_writethrough(bool);
#define FRONTSWAP_HAS_EXCLUSIVE_GETS
extern void frontswap_tmem_exclusive_gets(bool);
extern bool __frontswap_test(struct swap_info_struct *, pgoff_t);
extern void __frontswap_init(unsigned type);
extern int __frontswap_store(struct page *page);
extern int __frontswap_load(struct page *page);
@ -29,26 +30,11 @@ extern void __frontswap_invalidate_page(unsigned, pgoff_t);
extern void __frontswap_invalidate_area(unsigned);
#ifdef CONFIG_FRONTSWAP
#define frontswap_enabled (1)
static inline bool frontswap_test(struct swap_info_struct *sis, pgoff_t offset)
{
bool ret = false;
if (frontswap_enabled && sis->frontswap_map)
ret = test_bit(offset, sis->frontswap_map);
return ret;
}
static inline void frontswap_set(struct swap_info_struct *sis, pgoff_t offset)
{
if (frontswap_enabled && sis->frontswap_map)
set_bit(offset, sis->frontswap_map);
}
static inline void frontswap_clear(struct swap_info_struct *sis, pgoff_t offset)
{
if (frontswap_enabled && sis->frontswap_map)
clear_bit(offset, sis->frontswap_map);
return __frontswap_test(sis, offset);
}
static inline void frontswap_map_set(struct swap_info_struct *p,
@ -71,14 +57,6 @@ static inline bool frontswap_test(struct swap_info_struct *sis, pgoff_t offset)
return false;
}
static inline void frontswap_set(struct swap_info_struct *sis, pgoff_t offset)
{
}
static inline void frontswap_clear(struct swap_info_struct *sis, pgoff_t offset)
{
}
static inline void frontswap_map_set(struct swap_info_struct *p,
unsigned long *map)
{