linux-kernel - [PATCH 6.16 0/2] genirq: Fixes for CPU hotplug / disable-depth regressions

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Message-ID: <20250612183303.3433234-1-briannorris@chromium.org>
Date: Thu, 12 Jun 2025 11:32:50 -0700
From: Brian Norris <briannorris@...omium.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Douglas Anderson <dianders@...omium.org>,
	David Stevens <stevensd@...omium.org>,
	linux-kernel@...r.kernel.org,
	Tsai Sung-Fu <danielsftsai@...gle.com>,
	Aleksandrs Vinarskis <alex.vinarskis@...il.com>,
	Johan Hovold <johan@...nel.org>,
	Brian Norris <briannorris@...omium.org>
Subject: [PATCH 6.16 0/2] genirq: Fixes for CPU hotplug / disable-depth regressions

Hi,

Commit 788019eb559f ("genirq: Retain disable depth for managed
interrupts across CPU hotplug") was merged for v6.16-rc1, but it turns
out there were a few oversights.

One such report:

Re: [PATCH v2 1/2] genirq: Retain depth for managed IRQs across CPU hotplug
https://lore.kernel.org/lkml/24ec4adc-7c80-49e9-93ee-19908a97ab84@gmail.com/

This series contains two fixes for bugs that I've found locally and with
others' help. Some of the testing involved:

1. Aleksandrs Vinarskis tested suspend/resume + NVMe on Qualcomm
   Snapdragon X1E/X1P laptops:
   https://lore.kernel.org/lkml/CAMcHhXrT-y3EotxrcCZ0Pj8Sic6wsPSmRiW7NSzdG=9iH8xqKg@mail.gmail.com/

2. Locally-updated versions of kunit tests I've been working on for
   various kernel/irq/ code:
   Subject: [PATCH v4] genirq: Add kunit tests for depth counts
   https://lore.kernel.org/lkml/20250522210837.4135244-1-briannorris@chromium.org/

3. NVMe + x86 QEMU workloads, + system suspend

4. Pixel phones + modem driver + various CPU hotplug / system
   suspend/resume tests.
   (This is probably least compelling, because this doesn't use the
   latest mainline kernel, and it uses non-upstream drivers for some
   relevant components. But I figured I'd mention it, because we've
   noticed some similar problems to #1 here.)

Regards,
Brian

Brian Norris (2):
  genirq: Rebalance managed interrupts across multi-CPU hotplug
  genirq/cpuhotplug: Restore affinity even for suspended IRQ

 kernel/irq/chip.c       | 8 ++++++++
 kernel/irq/cpuhotplug.c | 7 -------
 2 files changed, 8 insertions(+), 7 deletions(-)

-- 
2.50.0.rc1.591.g9c95f17f64-goog