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| author |   Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2025-05-12 11:27:24 +0200 |
|---|---|---|
| committer |   Paolo Abeni <pabeni@redhat.com> | 2025-05-15 15:23:30 +0200 |
| commit | 1c0829788a6e6e165846b9bedd0b908ef16260b6 (patch) | |
| tree | 3cdf044e94bb3eef22e379d28bdc2b3ae3c1f975 | |
| parent | net: dst_cache: Use nested-BH locking for dst_cache::cache (diff) | |
| download | wireguard-linux-1c0829788a6e6e165846b9bedd0b908ef16260b6.tar.xz wireguard-linux-1c0829788a6e6e165846b9bedd0b908ef16260b6.zip | |
ipv4/route: Use this_cpu_inc() for stats on PREEMPT_RT
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>
| -rw-r--r-- | net/ipv4/route.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 507b2e5dec50..fccb05fb3a79 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -189,7 +189,11 @@ 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) |