From 0ddab1d2ed664c85c95488eef569786a84aedf37 Mon Sep 17 00:00:00 2001
From: Toshi Kani
Date: Tue, 14 Apr 2015 15:47:20 -0700
Subject: lib/ioremap.c: add huge I/O map capability interfaces

Add ioremap_pud_enabled() and ioremap_pmd_enabled(), which return 1 when
I/O mappings with pud/pmd are enabled on the kernel.

ioremap_huge_init() calls arch_ioremap_pud_supported() and
arch_ioremap_pmd_supported() to initialize the capabilities at boot-time.

A new kernel option "nohugeiomap" is also added, so that user can disable
the huge I/O map capabilities when necessary.

Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Robert Elliott <Elliott@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 include/linux/io.h | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'include')

diff --git a/include/linux/io.h b/include/linux/io.h
index fa02e55e5a2e..4cc299c598e0 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -38,6 +38,14 @@ static inline int ioremap_page_range(unsigned long addr, unsigned long end,
 }
 #endif
 
+#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
+void __init ioremap_huge_init(void);
+int arch_ioremap_pud_supported(void);
+int arch_ioremap_pmd_supported(void);
+#else
+static inline void ioremap_huge_init(void) { }
+#endif
+
 /*
  * Managed iomap interface
  */
-- 
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