linux-kernel - [PATCH 6.6 0/2] fix do_softirq_post_smp_call_flush warnings caused by NET_RX

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Message-Id: <cover.1766987153.git.wen.yang@linux.dev>
Date: Mon, 29 Dec 2025 15:53:15 +0800
From: wen.yang@...ux.dev
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: stable@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Wen Yang <wen.yang@...ux.dev>
Subject: [PATCH 6.6 0/2] fix do_softirq_post_smp_call_flush warnings caused by NET_RX_SOFTIRQ

From: Wen Yang <wen.yang@...ux.dev>

do_softirq_post_smp_call_flush() on PREEMPT_RT kernels carries a
WARN_ON_ONCE() for any SOFTIRQ being raised from an SMP-call-function.
Since do_softirq_post_smp_call_flush() is called with preempt disabled,
raising a SOFTIRQ during flush_smp_call_function_queue() can lead to
longer preempt disabled sections.

RPS distributes network processing load across CPUs by enqueuing
packets on a remote CPU's backlog and raising NET_RX_SOFTIRQ to
process them.

The following patches fixes this issue.

Sebastian Andrzej Siewior (2):
  net: Remove conditional threaded-NAPI wakeup based on task state.
  net: Allow to use SMP threads for backlog NAPI.

 net/core/dev.c | 162 +++++++++++++++++++++++++++++++++++--------------
 1 file changed, 115 insertions(+), 47 deletions(-)

-- 
2.25.1