linux-kernel - [PATCH v8 05/19] mm: ioremap: allow ARCH to have its own ioremap method definition

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20230706154520.11257-6-bhe@redhat.com>
Date:   Thu,  6 Jul 2023 23:45:06 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org, arnd@...db.de,
        hch@....de, christophe.leroy@...roup.eu, rppt@...nel.org,
        willy@...radead.org, agordeev@...ux.ibm.com,
        wangkefeng.wang@...wei.com, schnelle@...ux.ibm.com,
        shorne@...il.com, David.Laight@...LAB.COM, deller@....de,
        nathan@...nel.org, glaubitz@...sik.fu-berlin.de,
        Baoquan He <bhe@...hat.com>, linux-arch@...r.kernel.org
Subject: [PATCH v8 05/19] mm: ioremap: allow ARCH to have its own ioremap method definition

Architectures can be converted to GENERIC_IOREMAP, to take standard
ioremap_xxx() and iounmap() way. But some ARCH-es could have specific
handling for ioremap_prot(), ioremap() and iounmap(), than standard
methods.

In oder to convert these ARCH-es to take GENERIC_IOREMAP method, allow
these architecutres to have their own ioremap_prot(), ioremap() and
iounmap() definitions.

Signed-off-by: Baoquan He <bhe@...hat.com>
Acked-by: Arnd Bergmann <arnd@...db.de>
Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: Kefeng Wang <wangkefeng.wang@...wei.com>
Reviewed-by: Mike Rapoport (IBM) <rppt@...nel.org>
Cc: linux-arch@...r.kernel.org
---
 include/asm-generic/io.h | 3 +++
 mm/ioremap.c             | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index a7ca2099ba19..39244c3ee797 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
diff --git a/mm/ioremap.c b/mm/ioremap.c
index db6234b9db59..9f34a8f90b58 100644
--- a/mm/ioremap.c
+++ b/mm/ioremap.c
@@ -46,12 +46,14 @@ void __iomem *generic_ioremap_prot(phys_addr_t phys_addr, size_t size,
 	return (void __iomem *)(vaddr + offset);
 }
 
+#ifndef ioremap_prot
 void __iomem *ioremap_prot(phys_addr_t phys_addr, size_t size,
 			   unsigned long prot)
 {
 	return generic_ioremap_prot(phys_addr, size, __pgprot(prot));
 }
 EXPORT_SYMBOL(ioremap_prot);
+#endif
 
 void generic_iounmap(volatile void __iomem *addr)
 {
@@ -64,8 +66,10 @@ void generic_iounmap(volatile void __iomem *addr)
 		vunmap(vaddr);
 }
 
+#ifndef iounmap
 void iounmap(volatile void __iomem *addr)
 {
 	generic_iounmap(addr);
 }
 EXPORT_SYMBOL(iounmap);
+#endif
-- 
2.34.1