linux-kernel - Re: [PATCH v2 01/11] mm/ioremap: change the return value of io[re|un]map

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Message-ID: <YwQXbspuRgLH3Gxw@MiWiFi-R3L-srv>
Date:   Tue, 23 Aug 2022 07:55:26 +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
Subject: Re: [PATCH v2 01/11] mm/ioremap: change the return value of
 io[re|un]map_allowed and rename

On 08/20/22 at 11:53pm, Christoph Hellwig wrote:
> On Sat, Aug 20, 2022 at 08:31:15AM +0800, Baoquan He wrote:
> > +void __iomem *arch_ioremap(phys_addr_t phys_addr, size_t size, unsigned long prot);
> 
> Please avoid the overly long lines.

Thanks for reviewing. Will break the line.

> 
> I also wonder if we just want a common definition with a __weak default
> instead of duplicating it in many arch headers.

Seems __weak symbol is not suggested any more in kernel. Please see
below thread.

[PATCH] kexec_file: Drop weak attribute from arch_kexec_apply_relocations[_add]
https://lore.kernel.org/all/20220518181828.645877-1-naveen.n.rao@linux.vnet.ibm.com/T/#u

> 
> > +	ioaddr = arch_ioremap(phys_addr, size, prot);
> > +	if (IS_ERR(ioaddr))
> > +		return NULL;
> > +	else if (ioaddr)
> > +		return ioaddr;
> 
> No need for the else here.

Do you mean changing it like this? It's fine to me if I get it
correctly.

	ioaddr = arch_ioremap(phys_addr, size, prot);
	if (IS_ERR(ioaddr))
		return NULL;
	if (ioaddr)
		return ioaddr;

Thanks
Baoquan