net: mvpp2: add comments about smp_processor_id() usage
A previous commit modified a number of smp_processor_id() used in
migration-enabled contexts into get_cpu/put_cpu sections. However, a few
smp_processor_id() calls remain in the driver, and this commit adds
comments explaining why they can be kept.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/marvell/mvpp2.c b/drivers/net/ethernet/marvell/mvpp2.c
index ca4b55c..4b3bf37 100644
--- a/drivers/net/ethernet/marvell/mvpp2.c
+++ b/drivers/net/ethernet/marvell/mvpp2.c
@@ -4162,7 +4162,10 @@
MVPP2_ISR_DISABLE_INTERRUPT(cpu_mask));
}
-/* Mask the current CPU's Rx/Tx interrupts */
+/* Mask the current CPU's Rx/Tx interrupts
+ * Called by on_each_cpu(), guaranteed to run with migration disabled,
+ * using smp_processor_id() is OK.
+ */
static void mvpp2_interrupts_mask(void *arg)
{
struct mvpp2_port *port = arg;
@@ -4171,7 +4174,10 @@
MVPP2_ISR_RX_TX_MASK_REG(port->id), 0);
}
-/* Unmask the current CPU's Rx/Tx interrupts */
+/* Unmask the current CPU's Rx/Tx interrupts.
+ * Called by on_each_cpu(), guaranteed to run with migration disabled,
+ * using smp_processor_id() is OK.
+ */
static void mvpp2_interrupts_unmask(void *arg)
{
struct mvpp2_port *port = arg;
@@ -4554,7 +4560,11 @@
return txq->descs + tx_desc;
}
-/* Update HW with number of aggregated Tx descriptors to be sent */
+/* Update HW with number of aggregated Tx descriptors to be sent
+ *
+ * Called only from mvpp2_tx(), so migration is disabled, using
+ * smp_processor_id() is OK.
+ */
static void mvpp2_aggr_txq_pend_desc_add(struct mvpp2_port *port, int pending)
{
/* aggregated access - relevant TXQ number is written in TX desc */
@@ -4565,6 +4575,9 @@
/* Check if there are enough free descriptors in aggregated txq.
* If not, update the number of occupied descriptors and repeat the check.
+ *
+ * Called only from mvpp2_tx(), so migration is disabled, using
+ * smp_processor_id() is OK.
*/
static int mvpp2_aggr_desc_num_check(struct mvpp2 *priv,
struct mvpp2_tx_queue *aggr_txq, int num)
@@ -4583,7 +4596,12 @@
return 0;
}
-/* Reserved Tx descriptors allocation request */
+/* Reserved Tx descriptors allocation request
+ *
+ * Called only from mvpp2_txq_reserved_desc_num_proc(), itself called
+ * only by mvpp2_tx(), so migration is disabled, using
+ * smp_processor_id() is OK.
+ */
static int mvpp2_txq_alloc_reserved_desc(struct mvpp2 *priv,
struct mvpp2_tx_queue *txq, int num)
{
@@ -4687,6 +4705,10 @@
/* Get number of sent descriptors and decrement counter.
* The number of sent descriptors is returned.
* Per-CPU access
+ *
+ * Called only from mvpp2_txq_done(), called from mvpp2_tx()
+ * (migration disabled) and from the TX completion tasklet (migration
+ * disabled) so using smp_processor_id() is OK.
*/
static inline int mvpp2_txq_sent_desc_proc(struct mvpp2_port *port,
struct mvpp2_tx_queue *txq)
@@ -4701,6 +4723,9 @@
MVPP2_TRANSMITTED_COUNT_OFFSET;
}
+/* Called through on_each_cpu(), so runs on all CPUs, with migration
+ * disabled, therefore using smp_processor_id() is OK.
+ */
static void mvpp2_txq_sent_counter_clear(void *arg)
{
struct mvpp2_port *port = arg;