linux-kernel - Re: [PATCH v15 04/10] arm64: Kprobes with single stepping support

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Message-ID: <20160720162827.GF25890@e104818-lin.cambridge.arm.com>
Date:	Wed, 20 Jul 2016 17:28:28 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	David Long <dave.long@...aro.org>,
	Huang Shijie <shijie.huang@....com>,
	James Morse <james.morse@....com>,
	Pratyush Anand <panand@...hat.com>,
	Sandeepa Prabhu <sandeepa.s.prabhu@...il.com>,
	Will Deacon <will.deacon@....com>,
	William Cohen <wcohen@...hat.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Steve Capper <steve.capper@...aro.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Li Bin <huawei.libin@...wei.com>,
	Jisheng Zhang <jszhang@...vell.com>,
	Mark Rutland <mark.rutland@....com>,
	Daniel Thompson <daniel.thompson@...aro.org>,
	Vladimir Murzin <Vladimir.Murzin@....com>,
	Petr Mladek <pmladek@...e.com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Jens Wiklander <jens.wiklander@...aro.org>,
	Robin Murphy <robin.murphy@....com>,
	Mark Brown <broonie@...nel.org>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Dave P Martin <Dave.Martin@....com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	yalin wang <yalin.wang2010@...il.com>,
	Yang Shi <yang.shi@...aro.org>,
	Zi Shen Lim <zlim.lnx@...il.com>,
	John Blackwood <john.blackwood@...r.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alex Bennée <alex.bennee@...aro.org>,
	Adam Buchbinder <adam.buchbinder@...il.com>,
	Christoffer Dall <christoffer.dall@...aro.org>
Subject: Re: [PATCH v15 04/10] arm64: Kprobes with single stepping support

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