mm/mempool: minor coding style tweaks

Various coding style tweaks to various files under mm/

[[email protected]: mm/swapfile: minor coding style tweaks]
  Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: mm/sparse: minor coding style tweaks]
  Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: mm/vmscan: minor coding style tweaks]
  Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: mm/compaction: minor coding style tweaks]
  Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: mm/oom_kill: minor coding style tweaks]
  Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: mm/shmem: minor coding style tweaks]
  Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: mm/page_alloc: minor coding style tweaks]
  Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: mm/filemap: minor coding style tweaks]
  Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: mm/mlock: minor coding style tweaks]
  Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: mm/frontswap: minor coding style tweaks]
  Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: mm/vmalloc: minor coding style tweaks]
  Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: mm/memory_hotplug: minor coding style tweaks]
  Link: https://lkml.kernel.org/r/[email protected]
[[email protected]: mm/mempolicy: minor coding style tweaks]
  Link: https://lkml.kernel.org/r/[email protected]

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Zhiyuan Dai <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 084a5b9..149e774 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -2780,7 +2780,7 @@ static int swap_show(struct seq_file *swap, void *v)
 	unsigned int bytes, inuse;
 
 	if (si == SEQ_START_TOKEN) {
-		seq_puts(swap,"Filename\t\t\t\tType\t\tSize\t\tUsed\t\tPriority\n");
+		seq_puts(swap, "Filename\t\t\t\tType\t\tSize\t\tUsed\t\tPriority\n");
 		return 0;
 	}
 
@@ -3284,7 +3284,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
 					 sizeof(long),
 					 GFP_KERNEL);
 
-	if (p->bdev &&(swap_flags & SWAP_FLAG_DISCARD) && swap_discardable(p)) {
+	if (p->bdev && (swap_flags & SWAP_FLAG_DISCARD) && swap_discardable(p)) {
 		/*
 		 * When discard is enabled for swap with no particular
 		 * policy flagged, we set all swap discard flags here in