pid_namespace.c/.h: simplify defines

Move BITS_PER_PAGE from pid_namespace.c to pid_namespace.h, since we can
simplify the define PID_MAP_ENTRIES by using the BITS_PER_PAGE.

[akpm@linux-foundation.org: kernel/pid.c:54:1: warning: "BITS_PER_PAGE" redefined]
Signed-off-by: Raphael S.Carvalho <raphael.scarv@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 3 insertions, 6 deletions

diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
index 215e5e3dda10..8ac32836690e 100644
--- a/include/linux/pid_namespace.h
+++ b/include/linux/pid_namespace.h
@@ -13,7 +13,9 @@ struct pidmap {
        void *page;
 };
 
-#define PIDMAP_ENTRIES         ((PID_MAX_LIMIT + 8*PAGE_SIZE - 1)/PAGE_SIZE/8)
+#define BITS_PER_PAGE           (PAGE_SIZE * 8)
+#define BITS_PER_PAGE_MASK      (BITS_PER_PAGE-1)
+#define PIDMAP_ENTRIES          ((PID_MAX_LIMIT+BITS_PER_PAGE-1)/BITS_PER_PAGE)
 
 struct bsd_acct_struct;
 
diff --git a/kernel/pid.c b/kernel/pid.c
index 8147bdf22f36..6283d6412aff 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -51,9 +51,6 @@ int pid_max = PID_MAX_DEFAULT;
 int pid_max_min = RESERVED_PIDS + 1;
 int pid_max_max = PID_MAX_LIMIT;
 
-#define BITS_PER_PAGE           (PAGE_SIZE*8)
-#define BITS_PER_PAGE_MASK      (BITS_PER_PAGE-1)
-
 static inline int mk_pid(struct pid_namespace *pid_ns,
                 struct pidmap *map, int off)
 {
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index bea15bdf82b0..69473c4a653f 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -19,8 +19,6 @@
 #include <linux/reboot.h>
 #include <linux/export.h>
 
-#define BITS_PER_PAGE           (PAGE_SIZE*8)
-
 struct pid_cache {
         int nr_ids;
         char name[16];