linux-kernel - Re: [PATCH v2 07/11] openrisc: mm: Convert to GENERIC

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Date:   Mon, 29 Aug 2022 09:40:24 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, agordeev@...ux.ibm.com,
        wangkefeng.wang@...wei.com, linux-arm-kernel@...ts.infradead.org,
        Jonas Bonn <jonas@...thpole.se>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        Stafford Horne <shorne@...il.com>,
        openrisc@...ts.librecores.org
Subject: Re: [PATCH v2 07/11] openrisc: mm: Convert to GENERIC_IOREMAP

On 08/21/22 at 12:03am, Christoph Hellwig wrote:
> > +	if (unlikely(!mem_init_done)) {
> >  		if ((fixmaps_used + (size >> PAGE_SHIFT)) > FIX_N_IOREMAPS)
> > +			return IOMEM_ERR_PTR(ret);
> >  		v = fix_to_virt(FIX_IOREMAP_BEGIN + fixmaps_used);
> >  		fixmaps_used += (size >> PAGE_SHIFT);
> >  
> > +		if (ioremap_page_range(v, v + size, p, __pgprot(*prot_val))) {
> >  			fixmaps_used -= (size >> PAGE_SHIFT);
> > +			return IOMEM_ERR_PTR(ret);
> > +		}
> > +
> > +		return (void __iomem *)(offset + (char *)v);
> >  	}
> 
> This code needs to go away, and all very early boot uses of ioremap
> need to switch to use early_ioremap insted.

Makes sense. On openrisc, the thing is I didn't find one place where
ioremap() is called in arch code. I can cut the early ioremap out and
wrap into a separate early_ioremap() function, however I don't know
where to put it. Not sure if I miss anything or openrisc doesn't really
need early ioremap.