linux-kernel - Re: [PATCH v5 RESEND 06/17] mm/ioremap: add slab availability checking in ioremap

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Message-ID: <ZGR0mLozn5OQzAEN@infradead.org>
Date:   Tue, 16 May 2023 23:30:48 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        linux-mm@...ck.org, arnd@...db.de, christophe.leroy@...roup.eu,
        hch@...radead.org, agordeev@...ux.ibm.com,
        wangkefeng.wang@...wei.com, schnelle@...ux.ibm.com,
        David.Laight@...lab.com, shorne@...il.com, willy@...radead.org,
        deller@....de
Subject: Re: [PATCH v5 RESEND 06/17] mm/ioremap: add slab availability
 checking in ioremap_prot

On Mon, May 15, 2023 at 05:08:37PM +0800, Baoquan He wrote:
> Several architectures has done checking if slab if available in
> ioremap_prot(). In fact it should be done in generic ioremap_prot()
> since on any architecutre, slab allocator must be available before
> get_vm_area_caller() and vunmap() are used.
> 
> Add the checking into generic_ioremap_prot().

Should we add a WARN_ON/WARN_ON_ONCE to aid debugging?

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@....de>