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swap: remove __swp_swapcount() 

__swp_swapcount() just encloses the calling to swap_swapcount() with
get/put_swap_device().  It is called in __read_swap_cache_async() only,
which encloses the calling with get/put_swap_device() already.  So,
__read_swap_cache_async() can call swap_swapcount() directly.

Link: https://lkml.kernel.org/r/20230529061355.125791-4-ying.huang@intel.com
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Chris Li (Google) <chrisl@kernel.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Yu Zhao <yuzhao@google.com>
Cc: Yosry Ahmed <yosryahmed@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Huang Ying 2023-05-29 14:13:53 +08:00 committed by Andrew Morton
parent 46a774d3ea
commit 3ecdeb0f87
3 changed files with 4 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/swap.h
View File

@ -513,7 +513,7 @@ int find_first_swap(dev_t *device);
extern unsigned int count_swap_pages(int, int);
extern sector_t swapdev_block(int, pgoff_t);
extern int __swap_count(swp_entry_t entry);
extern int __swp_swapcount(swp_entry_t entry);
extern int swap_swapcount(struct swap_info_struct *si, swp_entry_t entry);
extern int swp_swapcount(swp_entry_t entry);
extern struct swap_info_struct *page_swap_info(struct page *);
extern struct swap_info_struct *swp_swap_info(swp_entry_t entry);
@ -591,7 +591,7 @@ static inline int __swap_count(swp_entry_t entry)
return 0;
}
static inline int __swp_swapcount(swp_entry_t entry)
static inline int swap_swapcount(struct swap_info_struct *si, swp_entry_t entry)
{
return 0;
}

2
mm/swap_state.c
View File

@ -447,7 +447,7 @@ struct page *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
* as SWAP_HAS_CACHE. That's done in later part of code or
* else swap_off will be aborted if we return NULL.
*/
if (!__swp_swapcount(entry) && swap_slot_cache_enabled)
if (!swap_swapcount(si, entry) && swap_slot_cache_enabled)
goto fail_put_swap;
/*

20
mm/swapfile.c
View File

@ -1444,7 +1444,7 @@ int __swap_count(swp_entry_t entry)
* This does not give an exact answer when swap count is continued,
* but does include the high COUNT_CONTINUED flag to allow for that.
*/
static int swap_swapcount(struct swap_info_struct *si, swp_entry_t entry)
int swap_swapcount(struct swap_info_struct *si, swp_entry_t entry)
{
pgoff_t offset = swp_offset(entry);
struct swap_cluster_info *ci;
@ -1456,24 +1456,6 @@ static int swap_swapcount(struct swap_info_struct *si, swp_entry_t entry)
return count;
}
/*
* How many references to @entry are currently swapped out?
* This does not give an exact answer when swap count is continued,
* but does include the high COUNT_CONTINUED flag to allow for that.
*/
int __swp_swapcount(swp_entry_t entry)
{
int count = 0;
struct swap_info_struct *si;
si = get_swap_device(entry);
if (si) {
count = swap_swapcount(si, entry);
put_swap_device(si);
}
return count;
}
/*
* How many references to @entry are currently swapped out?
* This considers COUNT_CONTINUED so it returns exact answer.