linux-kernel - Re: [PATCH 01/14] x86/dumpstack: Add SHOW_REGS

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Date:   Fri, 13 Mar 2020 12:10:04 +0100 (CET)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Vince Weaver <vincent.weaver@...ne.edu>,
        Dave Jones <dsj@...com>, Jann Horn <jannh@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 01/14] x86/dumpstack: Add SHOW_REGS_IRET mode

On Thu, 12 Mar 2020, Josh Poimboeuf wrote:

> Now that __show_regs() has the concept of "modes" to indicate which
> registers should be displayed, replace show_iret_regs() with a new
> SHOW_REGS_IRET mode.  This is only a cleanup and doesn't change any
> behavior.
> 
> Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
> ---
>  arch/x86/include/asm/kdebug.h |  1 +
>  arch/x86/kernel/dumpstack.c   | 27 ++++++++++-----------------
>  arch/x86/kernel/process_64.c  |  7 ++++++-
>  3 files changed, 17 insertions(+), 18 deletions(-)
> 
> diff --git a/arch/x86/include/asm/kdebug.h b/arch/x86/include/asm/kdebug.h
> index 247ab14c6309..6112227368e7 100644
> --- a/arch/x86/include/asm/kdebug.h
> +++ b/arch/x86/include/asm/kdebug.h
> @@ -23,6 +23,7 @@ enum die_val {
>  };
>  
>  enum show_regs_mode {
> +	SHOW_REGS_IRET,
>  	SHOW_REGS_SHORT,
>  	/*
>  	 * For when userspace crashed, but we don't think it's our fault, and
> diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
> index ae64ec7f752f..8a9ff25779ec 100644
> --- a/arch/x86/kernel/dumpstack.c
> +++ b/arch/x86/kernel/dumpstack.c
> @@ -126,15 +126,8 @@ void show_ip(struct pt_regs *regs, const char *loglvl)
>  	show_opcodes(regs, loglvl);
>  }
>  
> -void show_iret_regs(struct pt_regs *regs)
> -{
> -	show_ip(regs, KERN_DEFAULT);
> -	printk(KERN_DEFAULT "RSP: %04x:%016lx EFLAGS: %08lx", (int)regs->ss,
> -		regs->sp, regs->flags);
> -}
> -

There is also declaration of show_iret_regs() in 
arch/x86/include/asm/kdebug.h which can be removed now.

Miroslav