linux-kernel - [PATCH] um: add dummy ioremap and iounmap functions

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Date:   Wed, 24 May 2017 16:00:52 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-kernel@...r.kernel.org,
        user-mode-linux-devel@...ts.sourceforge.net
Cc:     Logan Gunthorpe <logang@...tatee.com>,
        Stephen Bates <sbates@...thlin.com>,
        Jeff Dike <jdike@...toit.com>,
        Richard Weinberger <richard@....at>
Subject: [PATCH] um: add dummy ioremap and iounmap functions

The user mode architecture does not provide ioremap or iounmap, and
because of this, the arch won't build when the functions are used in some
core libraries.

I have designs to use these functions in scatterlist.c where they'd
almost certainly never be called on the um architecture but it does need
to compile.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
Signed-off-by: Stephen Bates <sbates@...thlin.com>
Cc: Jeff Dike <jdike@...toit.com>
Cc: Richard Weinberger <richard@....at>
---
 arch/um/include/asm/io.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 arch/um/include/asm/io.h

diff --git a/arch/um/include/asm/io.h b/arch/um/include/asm/io.h
new file mode 100644
index 0000000..8f35d57
--- /dev/null
+++ b/arch/um/include/asm/io.h
@@ -0,0 +1,17 @@
+#ifndef _ASM_UM_IO_H
+#define _ASM_UM_IO_H
+
+#define ioremap ioremap
+static inline void __iomem *ioremap(phys_addr_t offset, size_t size)
+{
+	return (void __iomem *)(unsigned long)offset;
+}
+
+#define iounmap iounmap
+static inline void iounmap(void __iomem *addr)
+{
+}
+
+#include <asm-generic/io.h>
+
+#endif
-- 
2.1.4