From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pingfan Liu Date: Mon, 9 May 2022 12:13:03 +0800 Subject: [PATCHv3 0/2] cpu/hotplug: Keep cpu hotplug disabled until the rebooting cpu is stable Message-ID: <20220509041305.15056-1-kernelfans@gmail.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: kexec@lists.infradead.org For the arches (arm/arm64/ia64/riscv), which relies on the cpu hot-removing mechanism to implement "kexec -e", it is important to make sure that the rebooting happens on a valid online cpu. And this logic should have been guaranteed in migrate_to_reboot_cpu(). But the current code has either contradict (resolved by [2/2]) or redundancy (resolved by [1/2]) about the logic. V2 -> V3: Taking in [2/2], which also has problem with the valid rebooting cpu. (I had sent three patches for different arches. But maybe it is better to collapse them into one and collect acks from different arches' maintainers ) Cc: Eric Biederman Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Valentin Schneider Cc: Vincent Donnefort Cc: Ingo Molnar Cc: YueHaibing Cc: Baokun Li Cc: Randy Dunlap Cc: Valentin Schneider Cc: kexec at lists.infradead.org Cc: Geert Uytterhoeven Cc: Kees Cook Cc: Jens Axboe To: linux-ia64@vger.kernel.org Cc: Russell King Cc: Guenter Roeck Cc: Arnd Bergmann Cc: Wolfram Sang Cc: Lee Jones Cc: Catalin Marinas Cc: Will Deacon Cc: Mark Rutland Cc: Peter Collingbourne Cc: Marc Zyngier To: linux-arm-kernel@lists.infradead.org To: linux-kernel@vger.kernel.org Pingfan Liu (2): cpu/hotplug: Keep cpu hotplug disabled until the rebooting cpu is stable arm/arm64/ia64: kexec: fix the primary cpu passed to smp_shutdown_nonboot_cpus() arch/arm/kernel/reboot.c | 2 +- arch/arm64/kernel/process.c | 2 +- arch/ia64/kernel/process.c | 2 +- kernel/cpu.c | 16 ++++++++++------ kernel/kexec_core.c | 10 ++++------ 5 files changed, 17 insertions(+), 15 deletions(-) -- 2.31.1