asm-generic: introduce asm/bitsperlong.h

This provides a reliable way for asm-generic/types.h and other
files to find out if it is running on a 32 or 64 bit platform.

We cannot use CONFIG_64BIT for this in headers that are included
from user space because CONFIG symbols are not available there.
We also cannot do it inside of asm/types.h because some headers
need the word size but cannot include types.h.

The solution is to introduce a new header <asm/bitsperlong.h>
that defines both __BITS_PER_LONG for user space and
BITS_PER_LONG for usage in the kernel. The asm-generic
version falls back to 32 bit unless the architecture overrides
it, which I did for all 64 bit platforms.

Signed-off-by: Remis Lima Baima <remis.developer@googlemail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

2 files changed, 20 insertions, 8 deletions

diff --git a/arch/parisc/include/asm/bitsperlong.h b/arch/parisc/include/asm/bitsperlong.h
new file mode 100644
index 000000000000..75196b415d3f
--- /dev/null
+++ b/arch/parisc/include/asm/bitsperlong.h
@@ -0,0 +1,20 @@
+#ifndef __ASM_PARISC_BITSPERLONG_H
+#define __ASM_PARISC_BITSPERLONG_H
+
+/*
+ * using CONFIG_* outside of __KERNEL__ is wrong,
+ * __LP64__ was also removed from headers, so what
+ * is the right approach on parisc?
+ *      -arnd
+ */
+#if (defined(__KERNEL__) && defined(CONFIG_64BIT)) || defined (__LP64__)
+#define __BITS_PER_LONG 64
+#define SHIFT_PER_LONG 6
+#else
+#define __BITS_PER_LONG 32
+#define SHIFT_PER_LONG 5
+#endif
+
+#include <asm-generic/bitsperlong.h>
+
+#endif /* __ASM_PARISC_BITSPERLONG_H */
diff --git a/arch/parisc/include/asm/types.h b/arch/parisc/include/asm/types.h
index 7f5a39bfb4ce..20135cc80039 100644
--- a/arch/parisc/include/asm/types.h
+++ b/arch/parisc/include/asm/types.h
@@ -14,14 +14,6 @@ typedef unsigned short umode_t;
  */
 #ifdef __KERNEL__
 
-#ifdef CONFIG_64BIT
-#define BITS_PER_LONG 64
-#define SHIFT_PER_LONG 6
-#else
-#define BITS_PER_LONG 32
-#define SHIFT_PER_LONG 5
-#endif
-
 #ifndef __ASSEMBLY__
 
 /* Dma addresses are 32-bits wide.  */