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mm/swap: make swap_address_space an inline function

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make W=1 generates the following warning in page_mapping() for allnoconfig

  mm/util.c:700:15: warning: variable `entry' set but not used [-Wunused-but-set-variable]
     swp_entry_t entry;
                 ^~~~~

swap_address is a #define on !CONFIG_SWAP configurations.  Make the helper
an inline function to suppress the warning, add type checking and to apply
any side-effects in the parameter list.

Link: https://lkml.kernel.org/r/20210520084809.8576-12-mgorman@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman 2021-06-30 18:53:47 -07:00 committed by Linus Torvalds
parent 30522175d2
commit 2bb6a033fb
1 changed files with 5 additions and 1 deletions
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6
include/linux/swap.h
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@ -537,7 +537,11 @@ static inline void put_swap_device(struct swap_info_struct *si)
{
}
#define swap_address_space(entry) (NULL)
static inline struct address_space *swap_address_space(swp_entry_t entry)
{
return NULL;
}
#define get_nr_swap_pages() 0L
#define total_swap_pages 0L
#define total_swapcache_pages() 0UL