linux-kernel - Re: [PATCH V6 04/33] csky: Exception handling and mm-fault

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Date:   Fri, 28 Sep 2018 09:15:03 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Guo Ren <ren_guo@...ky.com>
Cc:     akpm@...ux-foundation.org, arnd@...db.de,
        daniel.lezcano@...aro.org, davem@...emloft.net,
        gregkh@...uxfoundation.org, jason@...edaemon.net,
        marc.zyngier@....com, mark.rutland@....com,
        mchehab+samsung@...nel.org, peterz@...radead.org, robh@...nel.org,
        robh+dt@...nel.org, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        devicetree@...r.kernel.org, green.hu@...il.com
Subject: Re: [PATCH V6 04/33] csky: Exception handling and mm-fault

> +#ifndef CONFIG_CPU_HAS_TLBI
> +	/*
> +	 * We fault-in kernel-space virtual memory on-demand. The
> +	 * 'reference' page table is init_mm.pgd.
> +	 *
> +	 * NOTE! We MUST NOT take any locks for this case. We may
> +	 * be in an interrupt or a critical region, and should
> +	 * only copy the information from the master page table,
> +	 * nothing more.
> +	 */
> +	if (unlikely(address >= VMALLOC_START && address <= VMALLOC_END))
> +	{

This doesn't fir the kernel style.  Please run checkpatch.pl over
your code and fix at least all warnings that don't seem clearly bogus.