linux-kernel - [PATCH net] doc: net: napi: Update documentation for napi_schedule

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Message-Id: <20240930153955.971657-1-sean.anderson@linux.dev>
Date: Mon, 30 Sep 2024 11:39:54 -0400
From: Sean Anderson <sean.anderson@...ux.dev>
To: "David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jonathan Corbet <corbet@....net>,
	Brett Creeley <bcreeley@....com>,
	Sean Anderson <sean.anderson@...ux.dev>
Subject: [PATCH net] doc: net: napi: Update documentation for napi_schedule_irqoff

Since commit 8380c81d5c4f ("net: Treat __napi_schedule_irqoff() as
__napi_schedule() on PREEMPT_RT"), napi_schedule_irqoff will do the
right thing if IRQs are threaded. Therefore, there is no need to use
IRQF_NO_THREAD.

Signed-off-by: Sean Anderson <sean.anderson@...ux.dev>
---
https://lore.kernel.org/netdev/20240913150954.2287196-1-sean.anderson@linux.dev/

 Documentation/networking/napi.rst | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/Documentation/networking/napi.rst b/Documentation/networking/napi.rst
index 7bf7b95c4f7a..dfa5d549be9c 100644
--- a/Documentation/networking/napi.rst
+++ b/Documentation/networking/napi.rst
@@ -144,9 +144,8 @@ IRQ should only be unmasked after a successful call to napi_complete_done():
 
 napi_schedule_irqoff() is a variant of napi_schedule() which takes advantage
 of guarantees given by being invoked in IRQ context (no need to
-mask interrupts). Note that PREEMPT_RT forces all interrupts
-to be threaded so the interrupt may need to be marked ``IRQF_NO_THREAD``
-to avoid issues on real-time kernel configurations.
+mask interrupts). napi_schedule_irqoff() will fall back to napi_schedule() if
+IRQs are threaded (such as if ``PREEMPT_RT`` is enabled).
 
 Instance to queue mapping
 -------------------------
-- 
2.35.1.1320.gc452695387.dirty