linux-kernel - Re: [PATCH v2 10/11] sh: mm: Convert to GENERIC

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Date:   Thu, 1 Sep 2022 15:36:43 +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,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, linux-sh@...r.kernel.org
Subject: Re: [PATCH v2 10/11] sh: mm: Convert to GENERIC_IOREMAP

On 08/21/22 at 12:06am, Christoph Hellwig wrote:
> > +void __iomem *
> > +arch_ioremap(phys_addr_t *paddr, size_t size, unsigned long *prot_val);
> > +#define arch_ioremap arch_ioremap
> 
> Shouldn't this still be under CONFIG_MMU?

Yeah, you are right, will put them under CONFIG_MMU.

I thought making GENERIC_IOREMAP depend MMU in Kconfig will contain
that. But people can manually set the Kconfig item freely. Thanks for
pointing it out.

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 5f220e903e5a..b63ad4698cf8 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -25,6 +25,7 @@ config SUPERH
        select GENERIC_SCHED_CLOCK
        select GENERIC_SMP_IDLE_THREAD
        select GUP_GET_PTE_LOW_HIGH if X2TLB
+       select GENERIC_IOREMAP if MMU

>