linux-kernel - [PATCH 04/20] sh: introduce arch

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Date:	Fri, 09 Oct 2015 18:15:59 -0400
From:	Dan Williams <dan.j.williams@...el.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-arch@...r.kernel.org,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	linux-arm-kernel@...ts.infradead.org, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 04/20] sh: introduce arch_memremap()

In preparation for removing ioremap_cache() introduce arch_memremap()
for sh.  This simply enforces that attempts to establish writethrough
mappings fail rather than silently fallback to uncached.

Cc: Arnd Bergmann <arnd@...db.de>
Cc: Ross Zwisler <ross.zwisler@...ux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 arch/sh/Kconfig      |    1 +
 arch/sh/mm/ioremap.c |    9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index d514df7e04dd..b5801ae0e952 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -54,6 +54,7 @@ config SUPERH32
 	def_bool ARCH = "sh"
 	select HAVE_KPROBES
 	select HAVE_KRETPROBES
+	select ARCH_HAS_MEMREMAP
 	select HAVE_IOREMAP_PROT if MMU && !X2TLB
 	select HAVE_FUNCTION_TRACER
 	select HAVE_FTRACE_MCOUNT_RECORD
diff --git a/arch/sh/mm/ioremap.c b/arch/sh/mm/ioremap.c
index 0c99ec2e7ed8..ce3819273368 100644
--- a/arch/sh/mm/ioremap.c
+++ b/arch/sh/mm/ioremap.c
@@ -86,6 +86,15 @@ __ioremap_caller(phys_addr_t phys_addr, unsigned long size,
 }
 EXPORT_SYMBOL(__ioremap_caller);
 
+void *arch_memremap(resource_size_t offset, size_t size, unsigned long flags)
+{
+	if ((flags & MEMREMAP_WB) == 0)
+		return NULL;
+
+	return (void __force *) __ioremap_mode(offset, size, PAGE_KERNEL);
+}
+EXPORT_SYMBOL(arch_memremap);
+
 /*
  * Simple checks for non-translatable mappings.
  */

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