linux-kernel - Re: [PATCH v2 04/10] powerpc/traps: Use REG_FMT in show_signal

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Message-ID: <20180727184023.Horde.KRXPzZpG18uxt_B9sy_FBg5@messagerie.si.c-s.fr>
Date:   Fri, 27 Jul 2018 18:40:23 +0200
From:   LEROY Christophe <christophe.leroy@....fr>
To:     Murilo Opsfelder Araujo <muriloo@...ux.ibm.com>
Cc:     linuxppc-dev@...ts.ozlabs.org, "Tobin C . Harding" <me@...in.cc>,
        Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
        Simon Guo <wei.guo.simon@...il.com>,
        Paul Mackerras <paulus@...ba.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Michael Neuling <mikey@...ling.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Cyril Bur <cyrilbur@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Balbir Singh <bsingharora@...il.com>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        Alastair D'Silva <alastair@...ilva.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 04/10] powerpc/traps: Use REG_FMT in
 show_signal_msg()

Murilo Opsfelder Araujo <muriloo@...ux.ibm.com> a écrit :

> Simplify the message format by using REG_FMT as the register format.  This
> avoids having two different formats and avoids checking for MSR_64BIT.

Are you sure it is what we want ?

Won't it change the behaviour for a 32 bits app running on a 64bits kernel ?

Christophe


>
> Signed-off-by: Murilo Opsfelder Araujo <muriloo@...ux.ibm.com>
> ---
>  arch/powerpc/kernel/traps.c | 12 ++++--------
>  1 file changed, 4 insertions(+), 8 deletions(-)
>
> diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
> index 4faab4705774..047d980ac776 100644
> --- a/arch/powerpc/kernel/traps.c
> +++ b/arch/powerpc/kernel/traps.c
> @@ -311,17 +311,13 @@ static bool show_unhandled_signals_ratelimited(void)
>  static void show_signal_msg(int signr, struct pt_regs *regs, int code,
>  			    unsigned long addr)
>  {
> -	const char fmt32[] = KERN_INFO "%s[%d]: unhandled signal %d " \
> -		"at %08lx nip %08lx lr %08lx code %x\n";
> -	const char fmt64[] = KERN_INFO "%s[%d]: unhandled signal %d " \
> -		"at %016lx nip %016lx lr %016lx code %x\n";
> -
>  	if (!unhandled_signal(current, signr))
>  		return;
>
> -	printk(regs->msr & MSR_64BIT ? fmt64 : fmt32,
> -	       current->comm, current->pid, signr,
> -	       addr, regs->nip, regs->link, code);
> +	pr_info("%s[%d]: unhandled signal %d at "REG_FMT \
> +		" nip "REG_FMT" lr "REG_FMT" code %x\n",
> +		current->comm, current->pid, signr, addr,
> +		regs->nip, regs->link, code);
>  }
>
>  void _exception_pkey(int signr, struct pt_regs *regs, int code,
> --
> 2.17.1