linux-kernel - Re: [PATCH RFC 6/6] kprobes: Add cases for arm and arm64 in sample module

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Message-ID: <20131025152428.GD10673@mudshark.cambridge.arm.com>
Date:	Fri, 25 Oct 2013 16:24:28 +0100
From:	Will Deacon <will.deacon@....com>
To:	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"patches@...aro.org" <patches@...aro.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"steve.capper@...aro.org" <steve.capper@...aro.org>,
	"nico@...aro.org" <nico@...aro.org>,
	"srikar@...ux.vnet.ibm.com" <srikar@...ux.vnet.ibm.com>,
	"rostedt@...dmis.org" <rostedt@...dmis.org>,
	"masami.hiramatsu.pt@...achi.com" <masami.hiramatsu.pt@...achi.com>,
	"dsaxena@...aro.org" <dsaxena@...aro.org>,
	"jiang.liu@...wei.com" <jiang.liu@...wei.com>,
	"Vijaya.Kumar@...iumnetworks.com" <Vijaya.Kumar@...iumnetworks.com>
Subject: Re: [PATCH RFC 6/6] kprobes: Add cases for arm and arm64 in sample
 module

On Thu, Oct 17, 2013 at 12:17:51PM +0100, Sandeepa Prabhu wrote:
> Add info prints in sample kprobe handlers for ARM and ARM64
> architecture.
> 
> Signed-off-by: Sandeepa Prabhu <sandeepa.prabhu@...aro.org>
> ---
>  samples/kprobes/kprobe_example.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/samples/kprobes/kprobe_example.c b/samples/kprobes/kprobe_example.c
> index 366db1a..0521246 100644
> --- a/samples/kprobes/kprobe_example.c
> +++ b/samples/kprobes/kprobe_example.c
> @@ -42,6 +42,14 @@ static int handler_pre(struct kprobe *p, struct pt_regs *regs)
>  			" ex1 = 0x%lx\n",
>  		p->addr, regs->pc, regs->ex1);
>  #endif
> +#ifdef CONFIG_ARM
> +	printk(KERN_INFO "pre_handler: p->addr = 0x%p, pc = 0x%lx\n",
> +			p->addr, regs->ARM_pc);
> +#endif
> +#ifdef CONFIG_ARM64
> +	printk(KERN_INFO "pre_handler: p->addr = 0x%p, pc = 0x%lx\n",
> +		p->addr, (long)regs->pc);
> +#endif

Huh? Why can't you combine these two together and either unconditionall cast
to long, or use void * and %p?

Will
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