[PATCH]pid.c: remove unused header files

git diff kernel/pid.c
diff --git a/kernel/pid.c b/kernel/pid.c
index e9fd8c1..97fa0b7 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -27,15 +27,12 @@
  */
 
 #include <linux/mm.h>
-#include <linux/module.h>
-#include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/rculist.h>
 #include <linux/bootmem.h>
 #include <linux/hash.h>
 #include <linux/pid_namespace.h>
 #include <linux/init_task.h>
-#include <linux/syscalls.h>
 
 #define pid_hashfn(nr, ns)     \
        hash_long((unsigned long)nr + (unsigned long)ns, pidhash_shift)
--

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