linux-kernel - Re: [PATCH v2 08/12] arm64: BTI: Decode BYTPE bits when printing PSTATE

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Date:   Fri, 11 Oct 2019 11:31:02 -0400
From:   Richard Henderson <richard.henderson@...aro.org>
To:     Dave Martin <Dave.Martin@....com>, linux-kernel@...r.kernel.org
Cc:     Andrew Jones <drjones@...hat.com>, Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Eugene Syromiatnikov <esyr@...hat.com>,
        Florian Weimer <fweimer@...hat.com>,
        "H.J. Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Kristina Martšenko <kristina.martsenko@....com>,
        Mark Brown <broonie@...nel.org>,
        Paul Elliott <paul.elliott@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Sudakshina Das <sudi.das@....com>,
        Szabolcs Nagy <szabolcs.nagy@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will.deacon@....com>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>,
        Amit Kachhap <amit.kachhap@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 08/12] arm64: BTI: Decode BYTPE bits when printing
 PSTATE

On 10/10/19 2:44 PM, Dave Martin wrote:
>  #define PSR_IL_BIT		(1 << 20)
> -#define PSR_BTYPE_CALL		(2 << PSR_BTYPE_SHIFT)
> +
> +/* Convenience names for the values of PSTATE.BTYPE */
> +#define PSR_BTYPE_NONE		(0b00 << PSR_BTYPE_SHIFT)
> +#define PSR_BTYPE_JC		(0b01 << PSR_BTYPE_SHIFT)
> +#define PSR_BTYPE_C		(0b10 << PSR_BTYPE_SHIFT)
> +#define PSR_BTYPE_J		(0b11 << PSR_BTYPE_SHIFT)

It'd be nice to sort this patch earlier, so that ...

> diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c
> index 4a3bd32..452ac5b 100644
> --- a/arch/arm64/kernel/signal.c
> +++ b/arch/arm64/kernel/signal.c
> @@ -732,7 +732,7 @@ static void setup_return(struct pt_regs *regs, struct k_sigaction *ka,
>  
>  	if (system_supports_bti()) {
>  		regs->pstate &= ~PSR_BTYPE_MASK;
> -		regs->pstate |= PSR_BTYPE_CALL;
> +		regs->pstate |= PSR_BTYPE_C;
>  	}
>  
>  	if (ka->sa.sa_flags & SA_RESTORER)

... setup_return does not need to be adjusted a second time.

I don't see any other conflicts vs patch 5.


r~