linux-kernel - [RFC PATCH 4/8] mm: ioremap: allow ARCH to have its own ioremap definition

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Date:   Wed, 12 Oct 2022 12:09:40 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Baoquan He <bhe@...hat.com>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        akpm@...ux-foundation.org, hch@...radead.org,
        agordeev@...ux.ibm.com, wangkefeng.wang@...wei.com,
        schnelle@...ux.ibm.com, David.Laight@...LAB.COM, shorne@...il.com,
        Arnd Bergmann <arnd@...db.de>
Subject: [RFC PATCH 4/8] mm: ioremap: allow ARCH to have its own ioremap definition

From: Baoquan He <bhe@...hat.com>

Architectures like xtensa, arc, can be converted to GENERIC_IOREMAP,
to take standard ioremap_prot() and ioremap_xxx() way. But they have
ARCH specific handling for ioremap() method, than standard ioremap()
method.

In oder to convert them to take GENERIC_IOREMAP method, allow these
architecutres to have their own ioremap definition.

This is a preparation patch, no functionality change.

Signed-off-by: Baoquan He <bhe@...hat.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: linux-arch@...r.kernel.org
Cc: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 include/asm-generic/io.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index 43eb4f62e954..b2ed73708a3e 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -1081,11 +1081,14 @@ void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
 void iounmap(volatile void __iomem *addr);
 void generic_iounmap(volatile void __iomem *addr);
 
+#ifndef ioremap
+#define ioremap ioremap
 static inline void __iomem *ioremap(phys_addr_t addr, size_t size)
 {
 	/* _PAGE_IOREMAP needs to be supplied by the architecture */
 	return ioremap_prot(addr, size, _PAGE_IOREMAP);
 }
+#endif
 #endif /* !CONFIG_MMU || CONFIG_GENERIC_IOREMAP */
 
 #ifndef ioremap_wc
-- 
2.37.1