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Date: Wed, 20 Jul 2016 17:28:28 +0100
From: Catalin Marinas <catalin.marinas@arm.com>
To: Marc Zyngier <marc.zyngier@arm.com>
Cc: David Long <dave.long@linaro.org>, Huang Shijie <shijie.huang@arm.com>,
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Subject: Re: [PATCH v15 04/10] arm64: Kprobes with single stepping support
Message-ID: <20160720162827.GF25890@e104818-lin.cambridge.arm.com>
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On Wed, Jul 20, 2016 at 05:09:28PM +0100, Marc Zyngier wrote:
> +static inline unsigned long min_stack_size(unsigned long addr)
> +{
> +	unsigned long size;
> +	struct kprobe_ctlblk *ctl;
> +
> +	if (on_irq_stack(addr, raw_smp_processor_id()))
> +		size = IRQ_STACK_PTR(raw_smp_processor_id()) - addr;
> +	else
> +		size = (unsigned long)current_thread_info() + THREAD_START_SP - addr;
> +
> +	return min(size, sizeof(ctl->jprobes_stack));
> +}

We could drop the local ctl pointer:

	return min(size, sizeof(((struct kprobe_ctlblk *)0)->jprobes_stack));

If you add a log, I'll push the patch on top of the kprobes branch.

Thanks.

-- 
Catalin