71 lines
2.0 KiB
Diff
71 lines
2.0 KiB
Diff
From a8c617a33aa12cc4f45c3be022babf026fd12a79 Mon Sep 17 00:00:00 2001
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Wed, 7 Mar 2012 21:10:04 +0100
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Subject: [PATCH 260/278] net: Use cpu_chill() instead of cpu_relax()
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Retry loops on RT might loop forever when the modifying side was
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preempted. Use cpu_chill() instead of cpu_relax() to let the system
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make progress.
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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Cc: stable-rt@vger.kernel.org
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---
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net/packet/af_packet.c | 5 +++--
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net/rds/ib_rdma.c | 3 ++-
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2 files changed, 5 insertions(+), 3 deletions(-)
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diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
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index d9d4970..ed8ef1e 100644
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--- a/net/packet/af_packet.c
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+++ b/net/packet/af_packet.c
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@@ -89,6 +89,7 @@
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#include <linux/virtio_net.h>
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#include <linux/errqueue.h>
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#include <linux/net_tstamp.h>
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+#include <linux/delay.h>
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#ifdef CONFIG_INET
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#include <net/inet_common.h>
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@@ -673,7 +674,7 @@ static void prb_retire_rx_blk_timer_expired(unsigned long data)
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if (BLOCK_NUM_PKTS(pbd)) {
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while (atomic_read(&pkc->blk_fill_in_prog)) {
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/* Waiting for skb_copy_bits to finish... */
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- cpu_relax();
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+ cpu_chill();
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}
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}
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@@ -928,7 +929,7 @@ static void prb_retire_current_block(struct tpacket_kbdq_core *pkc,
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if (!(status & TP_STATUS_BLK_TMO)) {
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while (atomic_read(&pkc->blk_fill_in_prog)) {
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/* Waiting for skb_copy_bits to finish... */
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- cpu_relax();
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+ cpu_chill();
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}
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}
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prb_close_block(pkc, pbd, po, status);
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diff --git a/net/rds/ib_rdma.c b/net/rds/ib_rdma.c
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index e8fdb17..5a44c6e 100644
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--- a/net/rds/ib_rdma.c
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+++ b/net/rds/ib_rdma.c
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@@ -34,6 +34,7 @@
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#include <linux/slab.h>
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#include <linux/rculist.h>
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#include <linux/llist.h>
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+#include <linux/delay.h>
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#include "rds.h"
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#include "ib.h"
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@@ -286,7 +287,7 @@ static inline void wait_clean_list_grace(void)
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for_each_online_cpu(cpu) {
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flag = &per_cpu(clean_list_grace, cpu);
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while (test_bit(CLEAN_LIST_BUSY_BIT, flag))
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- cpu_relax();
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+ cpu_chill();
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}
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}
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--
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1.7.10
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