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kernel: fix warning on retrying page pool release

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Fixes the following warning:
[  180.314652] NOHZ tick-stop error: local softirq work is pending, handler #08!!!

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2025-05-15 15:41:37 +02:00
parent ca51f7aaf5
commit 610dd871aa
1 changed files with 8 additions and 3 deletions
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11
target/linux/generic/hack-6.6/610-net-page_pool-try-to-free-deferred-skbs-while-waitin.patch
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@ -16,16 +16,17 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -873,7 +873,7 @@ static void page_pool_release_retry(stru
@@ -873,7 +873,8 @@ static void page_pool_release_retry(stru
{
struct delayed_work *dwq = to_delayed_work(wq);
struct page_pool *pool = container_of(dwq, typeof(*pool), release_dw);
- int inflight;
+ unsigned long flags;
+ int cpu, inflight;
inflight = page_pool_release(pool);
/* In rare cases, a driver bug may cause inflight to go negative.
@@ -885,6 +885,17 @@ static void page_pool_release_retry(stru
@@ -885,6 +886,21 @@ static void page_pool_release_retry(stru
if (inflight <= 0)
return;
@ -33,12 +34,16 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
+ * defer_list that can stay in the list until we have enough queued
+ * traffic.
+ */
+ local_irq_save(flags);
+ for_each_online_cpu(cpu) {
+ struct softnet_data *sd = &per_cpu(softnet_data, cpu);
+
+ if (!cmpxchg(&sd->defer_ipi_scheduled, 0, 1))
+ if (cpu == raw_smp_processor_id())
+ raise_softirq_irqoff(NET_RX_SOFTIRQ);
+ else if (!cmpxchg(&sd->defer_ipi_scheduled, 0, 1))
+ smp_call_function_single_async(cpu, &sd->defer_csd);
+ }
+ local_irq_restore(flags);
+
/* Periodic warning */
if (time_after_eq(jiffies, pool->defer_warn)) {