From: Huang Ying <ying.huang@xxxxxxxxx> Subject: mm/swapfile.c: call free_swap_slot() in __swap_entry_free() This is a code cleanup patch without functionality change. Originally, when __swap_entry_free() is called, and its return value is 0, free_swap_slot() will always be called to free the swap entry to the per-CPU pool. So move the call to free_swap_slot() to __swap_entry_free() to simplify the code. Link: http://lkml.kernel.org/r/20180827075535.17406-3-ying.huang@xxxxxxxxx Signed-off-by: "Huang, Ying" <ying.huang@xxxxxxxxx> Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Shaohua Li <shli@xxxxxxxxxx> Cc: Hugh Dickins <hughd@xxxxxxxxxx> Cc: Minchan Kim <minchan@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/swapfile.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) --- a/mm/swapfile.c~swap-call-free_swap_slot-in-__swap_entry_free +++ a/mm/swapfile.c @@ -1182,6 +1182,8 @@ static unsigned char __swap_entry_free(s ci = lock_cluster_or_swap_info(p, offset); usage = __swap_entry_free_locked(p, offset, usage); unlock_cluster_or_swap_info(p, ci); + if (!usage) + free_swap_slot(entry); return usage; } @@ -1212,10 +1214,8 @@ void swap_free(swp_entry_t entry) struct swap_info_struct *p; p = _swap_info_get(entry); - if (p) { - if (!__swap_entry_free(p, entry, 1)) - free_swap_slot(entry); - } + if (p) + __swap_entry_free(p, entry, 1); } /* @@ -1637,8 +1637,6 @@ int free_swap_and_cache(swp_entry_t entr !swap_page_trans_huge_swapped(p, entry)) __try_to_reclaim_swap(p, swp_offset(entry), TTRS_UNMAPPED | TTRS_FULL); - else if (!count) - free_swap_slot(entry); } return p != NULL; } _
