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ipv4/route: Use this_cpu_inc() for stats on PREEMPT_RT

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[ Upstream commit 1c0829788a ]

The statistics are incremented with raw_cpu_inc() assuming it always
happens with bottom half disabled. Without per-CPU locking in
local_bh_disable() on PREEMPT_RT this is no longer true.

Use this_cpu_inc() on PREEMPT_RT for the increment to not worry about
preemption.

Cc: David Ahern <dsahern@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://patch.msgid.link/20250512092736.229935-4-bigeasy@linutronix.de
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Sebastian Andrzej Siewior
2025-05-12 11:27:24 +02:00
committed by Greg Kroah-Hartman
parent 97033659fc
commit c1ee5f1675
1 changed files with 4 additions and 0 deletions
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net/ipv4/route.c
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@@ -200,7 +200,11 @@ const __u8 ip_tos2prio[16] = {
EXPORT_SYMBOL(ip_tos2prio);
static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat);
#ifndef CONFIG_PREEMPT_RT
#define RT_CACHE_STAT_INC(field) raw_cpu_inc(rt_cache_stat.field)
#else
#define RT_CACHE_STAT_INC(field) this_cpu_inc(rt_cache_stat.field)
#endif
#ifdef CONFIG_PROC_FS
static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos)