linux-kernel - [PATCH] mm/swap_slots: use conditional compilation for swap

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Date:   Tue, 30 Jan 2018 15:14:17 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Linux MM <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Tim Chen <tim.c.chen@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] mm/swap_slots: use conditional compilation for swap_slots.c

From: Randy Dunlap <rdunlap@...radead.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@...radead.org>
Cc: Tim Chen <tim.c.chen@...ux.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 */