linux-kernel - [PATCH 1/1] pid_namespace.c/.h: Simplifying defines.

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Date:	Wed,  6 Mar 2013 16:38:06 -0300
From:	"Raphael S.Carvalho" <raphael.scarv@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	linux-kernel@...r.kernel.org,
	"Raphael S.Carvalho" <raphael.scarv@...il.com>
Subject: [PATCH 1/1] pid_namespace.c/.h: Simplifying defines.

This patch removes BITS_PER_PAGE from pid_namespace.c and put
it into pid_namespace.h instead, since we can simplify the
define PID_MAP_ENTRIES by using the BITS_PER_PAGE.

Signed-off-by: Raphael S.Carvalho <raphael.scarv@...il.com>
---
 include/linux/pid_namespace.h |    3 ++-
 kernel/pid_namespace.c        |    2 --
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
index 215e5e3..e4ae945 100644
--- a/include/linux/pid_namespace.h
+++ b/include/linux/pid_namespace.h
@@ -13,7 +13,8 @@ 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 PIDMAP_ENTRIES		((PID_MAX_LIMIT+BITS_PER_PAGE-1)/BITS_PER_PAGE)
 
 struct bsd_acct_struct;
 
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index c1c3dc1..f158e27 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];
-- 
1.7.2.5

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