64 lines
1.8 KiB
Diff
64 lines
1.8 KiB
Diff
Subject: net: Use cpu_chill() instead of cpu_relax()
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Wed, 07 Mar 2012 21:10:04 +0100
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.8/older/patches-4.8.6-rt5.tar.xz
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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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---
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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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--- a/net/packet/af_packet.c
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+++ b/net/packet/af_packet.c
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@@ -63,6 +63,7 @@
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#include <linux/if_packet.h>
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#include <linux/wireless.h>
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#include <linux/kernel.h>
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+#include <linux/delay.h>
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#include <linux/kmod.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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@@ -695,7 +696,7 @@ static void prb_retire_rx_blk_timer_expi
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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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@@ -957,7 +958,7 @@ static void prb_retire_current_block(str
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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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--- 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_single_path.h"
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#include "ib_mr.h"
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@@ -210,7 +211,7 @@ static inline void wait_clean_list_grace
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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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