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Subject[PATCH] mm/swap_slots: use conditional compilation for swap_slots.c
Date
From: Randy Dunlap <rdunlap@infradead.org>

For mm/swap_slots.c, use the traditional Linux method of conditional
compilation and linking instead of always compiling it by using
#ifdef CONFIG_SWAP and #endif for the entire source file (excluding
header files).

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
---
mm/Makefile | 4 ++--
mm/swap_slots.c | 4 ----
2 files changed, 2 insertions(+), 6 deletions(-)

Tim, is there some reason that this is done as it currently is?

--- lnx-415.orig/mm/Makefile
+++ lnx-415/mm/Makefile
@@ -37,7 +37,7 @@ obj-y := filemap.o mempool.o oom_kill.
readahead.o swap.o truncate.o vmscan.o shmem.o \
util.o mmzone.o vmstat.o backing-dev.o \
mm_init.o mmu_context.o percpu.o slab_common.o \
- compaction.o vmacache.o swap_slots.o \
+ compaction.o vmacache.o \
interval_tree.o list_lru.o workingset.o \
debug.o $(mmu-y)

@@ -55,7 +55,7 @@ ifdef CONFIG_MMU
endif
obj-$(CONFIG_HAVE_MEMBLOCK) += memblock.o

-obj-$(CONFIG_SWAP) += page_io.o swap_state.o swapfile.o
+obj-$(CONFIG_SWAP) += page_io.o swap_state.o swapfile.o swap_slots.o
obj-$(CONFIG_FRONTSWAP) += frontswap.o
obj-$(CONFIG_ZSWAP) += zswap.o
obj-$(CONFIG_HAS_DMA) += dmapool.o
--- lnx-415.orig/mm/swap_slots.c
+++ lnx-415/mm/swap_slots.c
@@ -34,8 +34,6 @@
#include <linux/mutex.h>
#include <linux/mm.h>

-#ifdef CONFIG_SWAP
-
static DEFINE_PER_CPU(struct swap_slots_cache, swp_slots);
static bool swap_slot_cache_active;
bool swap_slot_cache_enabled;
@@ -356,5 +354,3 @@ repeat:

return entry;
}
-
-#endif /* CONFIG_SWAP */

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