linux-kernel - Re: [PATCH 01/11] mm/ioremap: change the return value of io[re|un]map

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Date:   Sun, 7 Aug 2022 09:51:41 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, hch@...radead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 01/11] mm/ioremap: change the return value of
 io[re|un]map_allowed

On 08/06/22 at 10:29am, Kefeng Wang wrote:
...snip...
> > > diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
> > > index 72974cb81343..d72eb310fb3c 100644
> > > --- a/include/asm-generic/io.h
> > > +++ b/include/asm-generic/io.h
> > > @@ -967,26 +967,27 @@ static inline void iounmap(volatile void __iomem *addr)
> > >   /*
> > >    * Arch code can implement the following two hooks when using GENERIC_IOREMAP
> > >    * ioremap_allowed() return a bool,
> > > - *   - true means continue to remap
> > > - *   - false means skip remap and return directly
> > > + *   - IS_ERR means return an error
> > > + *   - NULL means continue to remap
> > > + *   - a non-NULL, non-IS_ERR pointer is returned directly
> > If ioremap_allowed() returns a valid pointer, then the function name
> > is not as precise anymore.
> 
> Maybe use arch_ioremap/unmap as before, or some better name.

Looks good to me. Or ioremap_check() which is a generic name, and
usually xxx_check() can hanlde many things.