[PARISC] Add CONFIG_HPPA_IOREMAP to conditionally enable ioremap

Instead of making it a #define in asm/io.h, allow user to select
to turn on IOREMAP from the config menu.

Signed-off-by: Helge Deller <deller@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

2 files changed, 17 insertions, 7 deletions

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 6b3c50964ca9..fc5755d1db57 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -138,6 +138,17 @@ config 64BIT
           enable this option otherwise. The 64bit kernel is significantly bigger
           and slower than the 32bit one.
 
+config HPPA_IOREMAP
+        bool "Enable IOREMAP functionality (EXPERIMENTAL)"
+        depends on EXPERIMENTAL
+        default n
+        help
+          Enable this option if you want to enable real IOREMAPPING on PA-RISC.
+          Currently we just "simulate" I/O remapping, and enabling this option
+          will just crash your machine.
+
+          Say N here, unless you are a real PA-RISC Linux kernel hacker.
+
 config SMP
         bool "Symmetric multi-processing support"
         ---help---
diff --git a/arch/parisc/mm/ioremap.c b/arch/parisc/mm/ioremap.c
index edd9a9559cba..028772144191 100644
--- a/arch/parisc/mm/ioremap.c
+++ b/arch/parisc/mm/ioremap.c
@@ -72,7 +72,7 @@ remap_area_pmd(pmd_t *pmd, unsigned long address, unsigned long size,
         return 0;
 }
 
-#if USE_HPPA_IOREMAP
+#ifdef CONFIG_HPPA_IOREMAP
 static int 
 remap_area_pages(unsigned long address, unsigned long phys_addr,
                  unsigned long size, unsigned long flags)
@@ -114,7 +114,7 @@ remap_area_pages(unsigned long address, unsigned long phys_addr,
 
         return error;
 }
-#endif /* USE_HPPA_IOREMAP */
+#endif /* CONFIG_HPPA_IOREMAP */
 
 #ifdef CONFIG_DEBUG_IOREMAP
 static unsigned long last = 0;
@@ -154,8 +154,7 @@ EXPORT_SYMBOL(__raw_bad_addr);
  */
 void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags)
 {
-#if !(USE_HPPA_IOREMAP)
-
+#if !defined(CONFIG_HPPA_IOREMAP)
         unsigned long end = phys_addr + size - 1;
         /* Support EISA addresses */
         if ((phys_addr >= 0x00080000 && end < 0x000fffff)
@@ -222,10 +221,10 @@ void __iomem * __ioremap(unsigned long phys_addr, unsigned long size, unsigned l
 
 void iounmap(void __iomem *addr)
 {
-#if !(USE_HPPA_IOREMAP)
-        return;
-#else
+#ifdef CONFIG_HPPA_IOREMAP
         if (addr > high_memory)
                 return vfree((void *) (PAGE_MASK & (unsigned long __force) addr));
+#else
+        return;
 #endif
 }