From 9e5c33d7aeeef62e5fa7e74f94432685bd03026b Mon Sep 17 00:00:00 2001
From: Mark Salter <msalter@redhat.com>
Date: Mon, 7 Apr 2014 15:39:48 -0700
Subject: mm: create generic early_ioremap() support

This patch creates a generic implementation of early_ioremap() support
based on the existing x86 implementation.  early_ioremp() is useful for
early boot code which needs to temporarily map I/O or memory regions
before normal mapping functions such as ioremap() are available.

Some architectures have optional MMU.  In the no-MMU case, the remap
functions simply return the passed in physical address and the unmap
functions do nothing.

Signed-off-by: Mark Salter <msalter@redhat.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Cc: Borislav Petkov <borislav.petkov@amd.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 mm/Kconfig | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'mm/Kconfig')

diff --git a/mm/Kconfig b/mm/Kconfig
index 37fbe1ef5239..ebe5880c29d6 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -578,3 +578,6 @@ config PGTABLE_MAPPING
 
 	  You can check speed with zsmalloc benchmark:
 	  https://github.com/spartacus06/zsmapbench
+
+config GENERIC_EARLY_IOREMAP
+	bool
-- 
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