linux-kernel - Re: [PATCH] arm64: pass ESR_ELx to die() of cfi

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Date:   Mon, 20 Feb 2023 10:02:57 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Sangmoon Kim <sangmoon.kim@...sung.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Mark Brown <broonie@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: pass ESR_ELx to die() of cfi_handler

On Mon, Feb 20, 2023 at 04:34:41PM +0900, Sangmoon Kim wrote:
> Commit 0f2cb928a154 ("arm64: consistently pass ESR_ELx to die()") caused
> all callers to pass the ESR_ELx value to die().
> 
> For consistency, this patch also adds esr to die() call of cfi_handler.
> Also, when CFI error occurs, die handlers can use ESR_ELx value.
> 
> Signed-off-by: Sangmoon Kim <sangmoon.kim@...sung.com>

Consistently reporting the ESR value makes sense to me, so:

Acked-by: Mark Rutland <mark.rutland@....com>

Mark.

> ---
>  arch/arm64/kernel/traps.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
> index 0ccc063daccb..4a623e2e982b 100644
> --- a/arch/arm64/kernel/traps.c
> +++ b/arch/arm64/kernel/traps.c
> @@ -990,7 +990,7 @@ static int cfi_handler(struct pt_regs *regs, unsigned long esr)
>  
>  	switch (report_cfi_failure(regs, regs->pc, &target, type)) {
>  	case BUG_TRAP_TYPE_BUG:
> -		die("Oops - CFI", regs, 0);
> +		die("Oops - CFI", regs, esr);
>  		break;
>  
>  	case BUG_TRAP_TYPE_WARN:
> -- 
> 2.17.1
>