linux-kernel - [PATCH V2 0/4] Remove WARN_ON in save_processor

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Message-Id: <20230609075049.2651723-1-songshuaishuai@tinylab.org>
Date:   Fri,  9 Jun 2023 15:50:45 +0800
From:   Song Shuai <songshuaishuai@...ylab.org>
To:     catalin.marinas@....com, will@...nel.org, paul.walmsley@...ive.com,
        palmer@...belt.com, aou@...s.berkeley.edu, chris@...kel.net,
        jcmvbkbc@...il.com, songshuaishuai@...ylab.org,
        steven.price@....com, vincenzo.frascino@....com,
        leyfoon.tan@...rfivetech.com, mason.huo@...rfivetech.com,
        jeeheng.sia@...rfivetech.com, conor.dooley@...rochip.com,
        ajones@...tanamicro.com
Cc:     linux@...linux.org.uk, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: [PATCH V2 0/4] Remove WARN_ON in save_processor_state

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.

So remove the unnecessary checking in save_processor_state
for ARM,arm64,riscv,xtensa architechtures.

Changes since V1:
https://lore.kernel.org/linux-riscv/20230525025555.24104-1-songshuaishuai@tinylab.org/
- supplement the case of CONFIG_PM_SLEEP_SMP=n in commit message as Will suggests

Song Shuai (4):
  ARM: hibernate: remove WARN_ON in save_processor_state
  arm64: hibernate: remove WARN_ON in save_processor_state
  riscv: hibernate: remove WARN_ON in save_processor_state
  xtensa: hibernate: remove WARN_ON in save_processor_state

 arch/arm/kernel/hibernate.c    | 1 -
 arch/arm64/kernel/hibernate.c  | 1 -
 arch/riscv/kernel/hibernate.c  | 1 -
 arch/xtensa/kernel/hibernate.c | 1 -
 4 files changed, 4 deletions(-)

-- 
2.20.1