74 lines
2.4 KiB
Diff
74 lines
2.4 KiB
Diff
From 90c6aad822ad054d318d291ff811dbf02633070a Mon Sep 17 00:00:00 2001
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Message-Id: <90c6aad822ad054d318d291ff811dbf02633070a.1601675152.git.zanussi@kernel.org>
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In-Reply-To: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
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References: <5b5a156f9808b1acf1205606e03da117214549ea.1601675151.git.zanussi@kernel.org>
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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 188/333] net: Use cpu_chill() instead of cpu_relax()
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.148-rt64.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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diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
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index b3caf1eac6af..7d58aa1a3fa2 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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@@ -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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@@ -668,7 +669,7 @@ static void prb_retire_rx_blk_timer_expired(struct timer_list *t)
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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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@@ -930,7 +931,7 @@ 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 0b347f46b2f4..f395f06031bc 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_single_path.h"
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#include "ib_mr.h"
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@@ -222,7 +223,7 @@ 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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2.17.1
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