Re: (subset) [PATCH V2 0/4] Remove WARN_ON in save_processor_state

From: Palmer Dabbelt
Date: Thu Jun 22 2023 - 14:29:04 EST


On Wed, 21 Jun 2023 08:51:43 PDT (-0700), Catalin Marinas wrote:
On Fri, 09 Jun 2023 15:50:45 +0800, Song Shuai wrote:
During hibernation or restoration, freeze_secondary_cpus
checks num_online_cpus via BUG_ON, and the subsequent
save_processor_state also does the checking with WARN_ON.

In the case of CONFIG_PM_SLEEP_SMP=n, freeze_secondary_cpus
is not defined, but the sole possible condition to disable
CONFIG_PM_SLEEP_SMP is !SMP where num_online_cpus is always 1.
We also don't have to check it in save_processor_state.

[...]

Applied to arm64 (for-next/misc), thanks!

I couldn't tell whether this series would go in as a whole but given
that the patches are independent, I picked up the arm64 one.

[2/4] arm64: hibernate: remove WARN_ON in save_processor_state
https://git.kernel.org/arm64/c/615af0021a61

I was pretty much in the same spot until I saw this, so I'm picking the RISC-V bit and just ignoring the rest. It's testing so it might take a bit to
land in linux-next, but seems pretty safe.