linux-kernel - Re: [PATCH v2 11/25] powerpc/signal: Refactor bad frame logging

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Date:   Tue, 18 Aug 2020 18:19:54 -0700
From:   Joe Perches <joe@...ches.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v2 11/25] powerpc/signal: Refactor bad frame logging

On Tue, 2020-08-18 at 17:19 +0000, Christophe Leroy wrote:
> The logging of bad frame appears half a dozen of times
> and is pretty similar.
[]
> diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c
[]
> @@ -355,3 +355,14 @@ static unsigned long get_tm_stackpointer(struct task_struct *tsk)
>  #endif
>  	return ret;
>  }
> +
> +static const char fm32[] = KERN_INFO "%s[%d]: bad frame in %s: %p nip %08lx lr %08lx\n";
> +static const char fm64[] = KERN_INFO "%s[%d]: bad frame in %s: %p nip %016lx lr %016lx\n";

Why not remove this and use it in place with
%08lx/%016x used as %px with a case to (void *)?

> +void signal_fault(struct task_struct *tsk, struct pt_regs *regs,
> +		  const char *where, void __user *ptr)
> +{
> +	if (show_unhandled_signals)
> +		printk_ratelimited(regs->msr & MSR_64BIT ? fm64 : fm32, tsk->comm,
> +				   task_pid_nr(tsk), where, ptr, regs->nip, regs->link);

	pr_info_ratelimited("%s[%d]: bad frame in %s: %p nip %016lx lr %016lx\n",
			    tsk->comm, task_pid_nr(tsk), where, ptr,
			    (void *)regs->nip, (void *)regs->link);