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Subject[PATCH] mm: cleanup swap unused warning
On Tuesday 16 May 2006 20:55, Con Kolivas wrote:
> Ok so if we fix it by making swp_entry_t __attribute__((__unused__) we
> break swap migration code?
> If we make swap_free() an empty static inline function then gcc compiles in
> the variable needlessly and we won't know it.

Rather than assume I checked the generated code and I was wrong (which is
something I'm getting good at being).

The variable is not compiled in so the empty static inline as suggested by
Pekka suffices to silence this warning.

if CONFIG_SWAP is not defined we get:

mm/vmscan.c: In function ‘remove_mapping’:
mm/vmscan.c:387: warning: unused variable ‘swap’

Signed-off-by: Con Kolivas <>

include/linux/swap.h | 5 ++++-
1 files changed, 4 insertions(+), 1 deletion(-)

Index: linux-2.6.17-rc4/include/linux/swap.h
--- linux-2.6.17-rc4.orig/include/linux/swap.h 2006-05-16 23:07:35.000000000 +1000
+++ linux-2.6.17-rc4/include/linux/swap.h 2006-05-16 23:08:08.000000000 +1000
@@ -292,7 +292,10 @@ static inline void disable_swap_token(vo
#define show_swap_cache_info() /*NOTHING*/
#define free_swap_and_cache(swp) /*NOTHING*/
#define swap_duplicate(swp) /*NOTHING*/
-#define swap_free(swp) /*NOTHING*/
+static inline void swap_free(swp_entry_t swp)
#define read_swap_cache_async(swp,vma,addr) NULL
#define lookup_swap_cache(swp) NULL
#define valid_swaphandles(swp, off) 0
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