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SubjectRe: [PATCH v3] kernel: audit.c: Add __rcu annotation to RCU pointer
Good idea to CC the following on RCU patches:
Paul McKenney
Steven Rostedt
(Any others on the RCU maintainers list).
And, the list: rcu@vger.kernel.org

Could anyone Ack the patch? Looks safe and straight forward.

On Mon, Dec 02, 2019 at 12:03:48AM +0530, Amol Grover wrote:
> 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>
> ---
> v3:
> - update changelog to be more descriptive
>
> v2:
> - fix erroneous RCU pointer initialization
>
> kernel/audit.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/audit.c b/kernel/audit.c
> index da8dc0db5bd3..ff7cfc61f53d 100644
> --- a/kernel/audit.c
> +++ b/kernel/audit.c
> @@ -102,12 +102,13 @@ struct audit_net {
> * This struct is RCU protected; you must either hold the RCU lock for reading
> * or the associated spinlock for writing.
> */
> -static struct auditd_connection {
> +struct auditd_connection {
> struct pid *pid;
> u32 portid;
> struct net *net;
> struct rcu_head rcu;
> -} *auditd_conn = NULL;
> +};
> +static struct auditd_connection __rcu *auditd_conn;
> static DEFINE_SPINLOCK(auditd_conn_lock);
>
> /* If audit_rate_limit is non-zero, limit the rate of sending audit records
> --
> 2.24.0
>

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