linux-kernel - Re: [PATCH v2 06/35] nds32: MMU fault handling and page table management

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Date:   Thu, 7 Dec 2017 16:40:41 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Greentime Hu <green.hu@...il.com>
Cc:     greentime@...estech.com, linux-kernel@...r.kernel.org,
        arnd@...db.de, linux-arch@...r.kernel.org, tglx@...utronix.de,
        jason@...edaemon.net, marc.zyngier@....com, robh+dt@...nel.org,
        netdev@...r.kernel.org, deanbo422@...il.com,
        devicetree@...r.kernel.org, dhowells@...hat.com,
        will.deacon@....com, daniel.lezcano@...aro.org,
        linux-serial@...r.kernel.org, Vincent Chen <vincentc@...estech.com>
Subject: Re: [PATCH v2 06/35] nds32: MMU fault handling and page table
 management

On Mon, Nov 27, 2017 at 08:27:53PM +0800, Greentime Hu wrote:
> +void do_page_fault(unsigned long entry, unsigned long addr,
> +		   unsigned int error_code, struct pt_regs *regs)
[snip]
> +	/*
> +	 * If we're in an interrupt or have no user
> +	 * context, we must not take the fault..
> +	 */
> +	if (unlikely(in_atomic() || !mm))

Broken.  in_atomic() is wrong here - it should be faulthandler_disabled().