linux-kernel - [PATCH 2/4] sysctl: Remember the ctl_table we passed to register_sysctl

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Date:	Thu, 29 Nov 2007 10:46:26 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Herbert Xu <herbert@...dor.apana.org.au>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Serge Hallyn <serue@...ibm.com>,
	Daniel Lezcano <dlezcano@...ibm.com>,
	Cedric Le Goater <clg@...ibm.com>,
	Linux Containers <containers@...ts.osdl.org>,
	Pavel Emelyanov <xemul@...nvz.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, David Miller <davem@...emloft.net>,
	Olaf Kirch <okir@...e.de>, Olaf Hering <olaf@...fle.de>
Subject: [PATCH 2/4] sysctl: Remember the ctl_table we passed to register_sysctl_paths


By doing this we allow users of register_sysctl_paths that build
and dynamically allocate their ctl_table to be simpler.  This allows
them to just remember the ctl_table_header returned from
register_sysctl_paths from which they can now find the
ctl_table array they need to free.

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 include/linux/sysctl.h |    1 +
 kernel/sysctl.c        |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index eb522bf..8b2e9e0 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -1063,6 +1063,7 @@ struct ctl_table_header
 	struct list_head ctl_entry;
 	int used;
 	struct completion *unregistering;
+	struct ctl_table *ctl_table_arg;
 };
 
 /* struct ctl_path describes where in the hierarchy a table is added */
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index fa92e70..effae87 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1598,6 +1598,7 @@ struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
 		new += 2;
 	}
 	*prevp = table;
+	header->ctl_table_arg = table;
 
 	INIT_LIST_HEAD(&header->ctl_entry);
 	header->used = 0;
-- 
1.5.3.rc6.17.g1911

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