linux-kernel - [PATCH V2 2/4] arm64: hibernate: remove WARN_ON in save_processor

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Message-Id: <20230609075049.2651723-3-songshuaishuai@tinylab.org>
Date:   Fri,  9 Jun 2023 15:50:47 +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 2/4] arm64: hibernate: 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.

Signed-off-by: Song Shuai <songshuaishuai@...ylab.org>
---
 arch/arm64/kernel/hibernate.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/arm64/kernel/hibernate.c b/arch/arm64/kernel/hibernate.c
index 788597a6b6a2..02870beb271e 100644
--- a/arch/arm64/kernel/hibernate.c
+++ b/arch/arm64/kernel/hibernate.c
@@ -99,7 +99,6 @@ int pfn_is_nosave(unsigned long pfn)
 
 void notrace save_processor_state(void)
 {
-	WARN_ON(num_online_cpus() != 1);
 }
 
 void notrace restore_processor_state(void)
-- 
2.20.1