diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2012-03-07 21:10:04 +0100 |
|---|---|---|
| committer | Clark Williams <williams@redhat.com> | 2012-03-13 12:40:21 -0500 |
| commit | 3859514c908d95e2d0cd3d3459b1780205a4e9df (patch) | |
| tree | 39ad9bbe5d294c3bfc4147dc3ee88c1b0e7ffe91 | |
| parent | ed03c277ce70b361c82478d129a8e1a21314c298 (diff) | |
net: Use cpu_chill() instead of cpu_relax()
Retry loops on RT might loop forever when the modifying side was
preempted. Use cpu_chill() instead of cpu_relax() to let the system
make progress.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable-rt@vger.kernel.org
| -rw-r--r-- | net/packet/af_packet.c | 5 | ||||
| -rw-r--r-- | net/rds/ib_rdma.c | 3 |
2 files changed, 5 insertions, 3 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index d9d4970b9b07..ed8ef1eb2569 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -89,6 +89,7 @@ #include <linux/virtio_net.h> #include <linux/errqueue.h> #include <linux/net_tstamp.h> +#include <linux/delay.h> #ifdef CONFIG_INET #include <net/inet_common.h> @@ -673,7 +674,7 @@ static void prb_retire_rx_blk_timer_expired(unsigned long data) if (BLOCK_NUM_PKTS(pbd)) { while (atomic_read(&pkc->blk_fill_in_prog)) { /* Waiting for skb_copy_bits to finish... */ - cpu_relax(); + cpu_chill(); } } @@ -928,7 +929,7 @@ static void prb_retire_current_block(struct tpacket_kbdq_core *pkc, if (!(status & TP_STATUS_BLK_TMO)) { while (atomic_read(&pkc->blk_fill_in_prog)) { /* Waiting for skb_copy_bits to finish... */ - cpu_relax(); + cpu_chill(); } } prb_close_block(pkc, pbd, po, status); diff --git a/net/rds/ib_rdma.c b/net/rds/ib_rdma.c index e8fdb172adbb..5a44c6e77cd8 100644 --- a/net/rds/ib_rdma.c +++ b/net/rds/ib_rdma.c @@ -34,6 +34,7 @@ #include <linux/slab.h> #include <linux/rculist.h> #include <linux/llist.h> +#include <linux/delay.h> #include "rds.h" #include "ib.h" @@ -286,7 +287,7 @@ static inline void wait_clean_list_grace(void) for_each_online_cpu(cpu) { flag = &per_cpu(clean_list_grace, cpu); while (test_bit(CLEAN_LIST_BUSY_BIT, flag)) - cpu_relax(); + cpu_chill(); } } |