riscv: 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.

Fixes: c031721 ("RISC-V: Add arch functions to support hibernation/suspend-to-disk")
Signed-off-by: Song Shuai <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

Author: Song Shuai

arch/riscv/kernel/hibernate.c

@@ -80,7 +80,6 @@ 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)