Re: [PATCH v5 12/22] powerpc/syscall: Change condition to check MSR_RI

[Nicholas Piggin]

Excerpts from Christophe Leroy's message of February 9, 2021 1:10 am:
> In system_call_exception(), MSR_RI also needs to be checked on 8xx.
> Only booke and 40x doesn't have MSR_RI.

Reviewed-by: Nicholas Piggin <npiggin@xxxxxxxxx>

...
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
> ---
> v5: Also in interrupt exit prepare
> ---
>  arch/powerpc/kernel/interrupt.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/powerpc/kernel/interrupt.c b/arch/powerpc/kernel/interrupt.c
> index 1a2dec49f811..107ec39f05cb 100644
> --- a/arch/powerpc/kernel/interrupt.c
> +++ b/arch/powerpc/kernel/interrupt.c
> @@ -39,7 +39,7 @@ notrace long system_call_exception(long r3, long r4, long r5,
>  
>  	trace_hardirqs_off(); /* finish reconciling */
>  
> -	if (IS_ENABLED(CONFIG_PPC_BOOK3S))
> +	if (!IS_ENABLED(CONFIG_BOOKE) && !IS_ENABLED(CONFIG_40x))
>  		BUG_ON(!(regs->msr & MSR_RI));
>  	BUG_ON(!(regs->msr & MSR_PR));
>  	BUG_ON(!FULL_REGS(regs));
> @@ -338,7 +338,7 @@ notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs, unsigned
>  	unsigned long flags;
>  	unsigned long ret = 0;
>  
> -	if (IS_ENABLED(CONFIG_PPC_BOOK3S))
> +	if (!IS_ENABLED(CONFIG_BOOKE) && !IS_ENABLED(CONFIG_40x))
>  		BUG_ON(!(regs->msr & MSR_RI));
>  	BUG_ON(!(regs->msr & MSR_PR));
>  	BUG_ON(!FULL_REGS(regs));
> @@ -436,7 +436,8 @@ notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs, unsign
>  	unsigned long amr;
>  #endif
>  
> -	if (IS_ENABLED(CONFIG_PPC_BOOK3S) && unlikely(!(regs->msr & MSR_RI)))
> +	if (!IS_ENABLED(CONFIG_BOOKE) && !IS_ENABLED(CONFIG_40x) &&
> +	    unlikely(!(regs->msr & MSR_RI)))
>  		unrecoverable_exception(regs);
>  	BUG_ON(regs->msr & MSR_PR);
>  	BUG_ON(!FULL_REGS(regs));
> -- 
> 2.25.0
> 
>