linux-kernel - [PATCHv3 1/2] groups: Factor out a function to set a pre-sorted group list

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Message-ID: <3ccec8a13019b5e8ce7b1d7889677b778b070dc8.1416095211.git.josh@joshtriplett.org>
Date:	Sat, 15 Nov 2014 15:49:57 -0800
From:	Josh Triplett <josh@...htriplett.org>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Kees Cook <keescook@...omium.org>, mtk.manpages@...il.com,
	linux-api@...r.kernel.org, linux-man@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCHv3 1/2] groups: Factor out a function to set a pre-sorted
 group list

This way, functions that already need to sort the group list need not do
so twice.

The new set_groups_sorted is intentionally not exported.

Signed-off-by: Josh Triplett <josh@...htriplett.org>
---
v2, v3: No changes to patch 1/2.
 kernel/groups.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/kernel/groups.c b/kernel/groups.c
index 451698f..f0667e7 100644
--- a/kernel/groups.c
+++ b/kernel/groups.c
@@ -154,16 +154,26 @@ int groups_search(const struct group_info *group_info, kgid_t grp)
 }
 
 /**
+ * set_groups_sorted - Change a group subscription in a set of credentials
+ * @new: The newly prepared set of credentials to alter
+ * @group_info: The group list to install; must be sorted
+ */
+static void set_groups_sorted(struct cred *new, struct group_info *group_info)
+{
+	put_group_info(new->group_info);
+	get_group_info(group_info);
+	new->group_info = group_info;
+}
+
+/**
  * set_groups - Change a group subscription in a set of credentials
  * @new: The newly prepared set of credentials to alter
  * @group_info: The group list to install
  */
 void set_groups(struct cred *new, struct group_info *group_info)
 {
-	put_group_info(new->group_info);
 	groups_sort(group_info);
-	get_group_info(group_info);
-	new->group_info = group_info;
+	set_groups_sorted(new, group_info);
 }
 
 EXPORT_SYMBOL(set_groups);
-- 
2.1.3

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