linux-kernel - RE: [PATCH] riscv: hibernation: Remove duplicate call of suspend_restore

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Date:   Fri, 19 May 2023 11:14:27 +0000
From:   JeeHeng Sia <jeeheng.sia@...rfivetech.com>
To:     Song Shuai <suagrfillet@...il.com>,
        "paul.walmsley@...ive.com" <paul.walmsley@...ive.com>,
        "palmer@...belt.com" <palmer@...belt.com>,
        "aou@...s.berkeley.edu" <aou@...s.berkeley.edu>,
        Mason Huo <mason.huo@...rfivetech.com>,
        Leyfoon Tan <leyfoon.tan@...rfivetech.com>,
        "ajones@...tanamicro.com" <ajones@...tanamicro.com>
CC:     "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Song Shuai <songshuaishuai@...ylab.org>
Subject: RE: [PATCH] riscv: hibernation: Remove duplicate call of
 suspend_restore_csrs

looks good to me.

Thanks
Regards
Jee Heng

> -----Original Message-----
> From: Song Shuai <suagrfillet@...il.com>
> Sent: Friday, May 19, 2023 6:29 PM
> To: paul.walmsley@...ive.com; palmer@...belt.com; aou@...s.berkeley.edu; suagrfillet@...il.com; Mason Huo
> <mason.huo@...rfivetech.com>; Leyfoon Tan <leyfoon.tan@...rfivetech.com>; ajones@...tanamicro.com; JeeHeng Sia
> <jeeheng.sia@...rfivetech.com>
> Cc: linux-riscv@...ts.infradead.org; linux-kernel@...r.kernel.org; Song Shuai <songshuaishuai@...ylab.org>
> Subject: [PATCH] riscv: hibernation: Remove duplicate call of suspend_restore_csrs
> 
> The suspend_restore_csrs is called in both __hibernate_cpu_resume
> and the `else` of subsequent swsusp_arch_suspend.
> 
> Removing the first call makes both suspend_{save,restore}_csrs
> left in swsusp_arch_suspend for clean code.
> 
> Signed-off-by: Song Shuai <suagrfillet@...il.com>
> Signed-off-by: Song Shuai <songshuaishuai@...ylab.org>
> ---
>  arch/riscv/kernel/hibernate-asm.S | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/arch/riscv/kernel/hibernate-asm.S b/arch/riscv/kernel/hibernate-asm.S
> index 5c76671c7e15..d698dd7df637 100644
> --- a/arch/riscv/kernel/hibernate-asm.S
> +++ b/arch/riscv/kernel/hibernate-asm.S
> @@ -28,7 +28,6 @@ ENTRY(__hibernate_cpu_resume)
> 
>  	REG_L	a0, hibernate_cpu_context
> 
> -	suspend_restore_csrs
>  	suspend_restore_regs
Good catch. This function is invoked twice to restore the CSRs. I am good with removing this function from here.
> 
>  	/* Return zero value. */
> --
> 2.20.1