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audit: Add __rcu annotation to RCU pointer

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Add __rcu annotation to RCU-protected global pointer auditd_conn.

auditd_conn is an RCU-protected global pointer,i.e., accessed
via RCU methods rcu_dereference() and rcu_assign_pointer(),
hence it must be annotated with __rcu for sparse to report
warnings/errors correctly.

Fix multiple instances of the sparse error:
error: incompatible types in comparison expression
(different address spaces)

Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Amol Grover <frextrite@gmail.com>
[PM: tweak subject line]
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Amol Grover 2019-12-02 00:03:48 +05:30 committed by Paul Moore
parent e42617b825
commit cb5172d96d
1 changed files with 3 additions and 2 deletions
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5
kernel/audit.c
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@ -102,12 +102,13 @@ struct audit_net {
* This struct is RCU protected; you must either hold the RCU lock for reading * This struct is RCU protected; you must either hold the RCU lock for reading
* or the associated spinlock for writing. * or the associated spinlock for writing.
*/ */
static struct auditd_connection { struct auditd_connection {
struct pid *pid; struct pid *pid;
u32 portid; u32 portid;
struct net *net; struct net *net;
struct rcu_head rcu; struct rcu_head rcu;
} *auditd_conn = NULL; };
static struct auditd_connection __rcu *auditd_conn;
static DEFINE_SPINLOCK(auditd_conn_lock); static DEFINE_SPINLOCK(auditd_conn_lock);
/* If audit_rate_limit is non-zero, limit the rate of sending audit records /* If audit_rate_limit is non-zero, limit the rate of sending audit records