linux-kernel - Re: [PATCH v2 3/4] powerpc/interrupt: Rename and lightly change syscall_exit_prepare

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Date:   Fri, 11 Jun 2021 12:32:34 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2 3/4] powerpc/interrupt: Rename and lightly change
 syscall_exit_prepare_main()

Excerpts from Christophe Leroy's message of June 5, 2021 12:56 am:
> Rename syscall_exit_prepare_main() into interrupt_exit_prepare_main()
> 
> Make it static as it is not used anywhere else.
> 
> Pass it the 'ret' so that it can 'or' it directly instead of
> oring twice, once inside the function and once outside.
> 
> And remove 'r3' parameter which is not used.
> 
> Also fix a typo where CONFIG_PPC_BOOK3S should be CONFIG_PPC_BOOK3S_64.

This all looks good I think. I need to grab this fix from your series.

Reviewed-by: Nicholas Piggin <npiggin@...il.com>

> 
> Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
> ---
>  arch/powerpc/kernel/interrupt.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c
> index b6aa80930733..bc3c1892ed80 100644
> --- a/arch/powerpc/kernel/interrupt.c
> +++ b/arch/powerpc/kernel/interrupt.c
> @@ -228,11 +228,10 @@ static notrace void booke_load_dbcr0(void)
>  #endif
>  }
>  
> -notrace unsigned long syscall_exit_prepare_main(unsigned long r3,
> -						struct pt_regs *regs)
> +static notrace unsigned long
> +interrupt_exit_user_prepare_main(struct pt_regs *regs, unsigned long ret)
>  {
>  	unsigned long ti_flags;
> -	unsigned long ret = 0;
>  
>  again:
>  	ti_flags = READ_ONCE(current_thread_info()->flags);
> @@ -254,7 +253,7 @@ notrace unsigned long syscall_exit_prepare_main(unsigned long r3,
>  		ti_flags = READ_ONCE(current_thread_info()->flags);
>  	}
>  
> -	if (IS_ENABLED(CONFIG_PPC_BOOK3S) && IS_ENABLED(CONFIG_PPC_FPU)) {
> +	if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && IS_ENABLED(CONFIG_PPC_FPU)) {
>  		if (IS_ENABLED(CONFIG_PPC_TRANSACTIONAL_MEM) &&
>  				unlikely((ti_flags & _TIF_RESTORE_TM))) {
>  			restore_tm_state(regs);
> @@ -350,7 +349,7 @@ notrace unsigned long syscall_exit_prepare(unsigned long r3,
>  	}
>  
>  	local_irq_disable();
> -	ret |= syscall_exit_prepare_main(r3, regs);
> +	ret = interrupt_exit_user_prepare_main(regs, ret);
>  
>  #ifdef CONFIG_PPC64
>  	regs->exit_result = ret;
> @@ -378,7 +377,7 @@ notrace unsigned long syscall_exit_restart(unsigned long r3, struct pt_regs *reg
>  
>  	BUG_ON(!user_mode(regs));
>  
> -	regs->exit_result |= syscall_exit_prepare_main(r3, regs);
> +	regs->exit_result = interrupt_exit_user_prepare_main(regs, regs->exit_result);
>  
>  	return regs->exit_result;
>  }
> -- 
> 2.25.0
> 
>