linux-kernel - Re: [patch 07/24] x86/traps: Prepare for using DEFINE

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Date:   Fri, 28 Feb 2020 15:13:43 +0100
From:   Alexandre Chartre <alexandre.chartre@...cle.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Steven Rostedt <rostedt@...dmis.org>,
        Brian Gerst <brgerst@...il.com>,
        Juergen Gross <jgross@...e.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [patch 07/24] x86/traps: Prepare for using DEFINE_IDTENTRY


On 2/25/20 11:16 PM, Thomas Gleixner wrote:
> Prepare for using IDTENTRY to define the C exception/trap entry points. It
> would be possible to glue this into the existing macro maze, but it's
> simpler and better to read at the end to just make them distinct. Provide
> a trivial inline helper to read the trap address.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
>   arch/x86/kernel/traps.c |    5 +++++
>   1 file changed, 5 insertions(+)
> 
> --- a/arch/x86/kernel/traps.c
> +++ b/arch/x86/kernel/traps.c
> @@ -274,6 +274,11 @@ static void do_error_trap(struct pt_regs
>   	}
>   }
>   
> +static inline void __user *error_get_trap_addr(struct pt_regs *regs)
> +{
> +	return (void __user *)uprobe_get_trap_addr(regs);
> +}
> +
>   #define IP ((void __user *)uprobe_get_trap_addr(regs))

And you will eventually get rid of this IP macro, right?

Reviewed-by: Alexandre Chartre <alexandre.chartre@...cle.com>

alex.

>   #define DO_ERROR(trapnr, signr, sicode, addr, str, name)		   \
>   dotraplinkage void do_##name(struct pt_regs *regs, long error_code)	   \
> 
>