linux-kernel - [PATCH 0/1] MIPS: Fix idle VS timer enqueue

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Message-ID: <20250214105047.150835-1-marco.crivellari@suse.com>
Date: Fri, 14 Feb 2025 11:50:46 +0100
From: Marco Crivellari <marco.crivellari@...e.com>
To: linux-mips@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Marco Crivellari <marco.crivellari@...e.com>,
	Frederic Weisbecker <frederic@...nel.org>
Subject: [PATCH 0/1] MIPS: Fix idle VS timer enqueue

This patch aims to fix idle routine while the CPU receive an interrupt,
because __r4k_wait() only checks if TIF_NEED_RESCHED is set before 
going to sleep.
The same behavior has been changed in LoongArch [1].

Code (cross) compiled successfully and I manage to test it on a VM
emulating a malta board. I ran QEMU with:

qemu-system-mips64el -M malta -m 2G -kernel vmlinux -serial stdio -drive \
file=rootfs.ext2,format=raw -append "rootwait root=/dev/sda" -cpu 5Kc

rootfs generated using buildroot (malta default configuration).

- [1] https://github.com/chenhuacai/linux/commit/a8aa673ea46c03b3f62992ffa4ffe810ac84f6e3

Marco Crivellari (1):
  MIPS: Fix idle VS timer enqueue

 arch/mips/kernel/genex.S | 36 ++++++++++++++++++++----------------
 arch/mips/kernel/idle.c  |  1 -
 2 files changed, 20 insertions(+), 17 deletions(-)

-- 
2.48.1