mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 14:43:58 +08:00
4f89849da2
Frontswap initialization routine depends on swap_lock, which want to be atomic about frontswap's first appearance. IOW, frontswap is not present and will fail all calls OR frontswap is fully functional but if new swap_info_struct isn't registered by enable_swap_info, swap subsystem doesn't start I/O so there is no race between init procedure and page I/O working on frontswap. So let's remove unnecessary swap_lock dependency. Cc: Dan Magenheimer <dan.magenheimer@oracle.com> Signed-off-by: Minchan Kim <minchan@kernel.org> [v1: Rebased on my branch, reworked to work with backends loading late] [v2: Added a check for !map] [v3: Made the invalidate path follow the init path] [v4: Address comments by Wanpeng Li <liwanp@linux.vnet.ibm.com>] Signed-off-by: Konrad Rzeszutek Wilk <konrad@darnok.org> Signed-off-by: Bob Liu <lliubbo@gmail.com> Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com> Cc: Andor Daam <andor.daam@googlemail.com> Cc: Florian Schmaus <fschmaus@gmail.com> Cc: Stefan Hengelein <ilendir@googlemail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
#ifndef _LINUX_FRONTSWAP_H
|
|
#define _LINUX_FRONTSWAP_H
|
|
|
|
#include <linux/swap.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/bitops.h>
|
|
|
|
struct frontswap_ops {
|
|
void (*init)(unsigned);
|
|
int (*store)(unsigned, pgoff_t, struct page *);
|
|
int (*load)(unsigned, pgoff_t, struct page *);
|
|
void (*invalidate_page)(unsigned, pgoff_t);
|
|
void (*invalidate_area)(unsigned);
|
|
};
|
|
|
|
extern bool frontswap_enabled;
|
|
extern struct frontswap_ops *
|
|
frontswap_register_ops(struct frontswap_ops *ops);
|
|
extern void frontswap_shrink(unsigned long);
|
|
extern unsigned long frontswap_curr_pages(void);
|
|
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, unsigned long *map);
|
|
extern int __frontswap_store(struct page *page);
|
|
extern int __frontswap_load(struct page *page);
|
|
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)
|
|
{
|
|
return __frontswap_test(sis, offset);
|
|
}
|
|
|
|
static inline void frontswap_map_set(struct swap_info_struct *p,
|
|
unsigned long *map)
|
|
{
|
|
p->frontswap_map = map;
|
|
}
|
|
|
|
static inline unsigned long *frontswap_map_get(struct swap_info_struct *p)
|
|
{
|
|
return p->frontswap_map;
|
|
}
|
|
#else
|
|
/* all inline routines become no-ops and all externs are ignored */
|
|
|
|
#define frontswap_enabled (0)
|
|
|
|
static inline bool frontswap_test(struct swap_info_struct *sis, pgoff_t offset)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline void frontswap_map_set(struct swap_info_struct *p,
|
|
unsigned long *map)
|
|
{
|
|
}
|
|
|
|
static inline unsigned long *frontswap_map_get(struct swap_info_struct *p)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
static inline int frontswap_store(struct page *page)
|
|
{
|
|
int ret = -1;
|
|
|
|
if (frontswap_enabled)
|
|
ret = __frontswap_store(page);
|
|
return ret;
|
|
}
|
|
|
|
static inline int frontswap_load(struct page *page)
|
|
{
|
|
int ret = -1;
|
|
|
|
if (frontswap_enabled)
|
|
ret = __frontswap_load(page);
|
|
return ret;
|
|
}
|
|
|
|
static inline void frontswap_invalidate_page(unsigned type, pgoff_t offset)
|
|
{
|
|
if (frontswap_enabled)
|
|
__frontswap_invalidate_page(type, offset);
|
|
}
|
|
|
|
static inline void frontswap_invalidate_area(unsigned type)
|
|
{
|
|
if (frontswap_enabled)
|
|
__frontswap_invalidate_area(type);
|
|
}
|
|
|
|
static inline void frontswap_init(unsigned type, unsigned long *map)
|
|
{
|
|
if (frontswap_enabled)
|
|
__frontswap_init(type, map);
|
|
}
|
|
|
|
#endif /* _LINUX_FRONTSWAP_H */
|