linux-kernel - Re: [PATCH v5 RESEND 14/17] mm/ioremap: Consider IOREMAP space in generic ioremap

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Date:   Tue, 16 May 2023 23:44:25 -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 14/17] mm/ioremap: Consider IOREMAP space in
 generic ioremap

On Tue, May 16, 2023 at 11:41:26PM -0700, Christoph Hellwig wrote:
> I think this would be cleaner if we'd just always use
> __get_vm_area_caller and at the top of the file add a:
> 
> #ifndef IOREMAP_START
> #define IOREMAP_START	VMALLOC_START
> #define IOREMAP_END	VMALLOC_END
> #endif
> 
> Together with a little comment that ioremap often, but not always
> uses the generic vmalloc area.

.. and with that we can also simply is_ioremap_addr by moving it
to ioremap.c and making it always operate on the IOREMAP constants.