Btrfs-progs: Fix compiler warnings on PPC64

The kernel uses unsigned long long for u64, but PPC64 uses unsigned
long by default. This results in compilation warnings such as:

print-tree.c:333: warning: format '%llu' expects type 'long long
unsigned int', but argument 4 has type 'u64'

To fix this, the macro __KERNEL__ needs to be defined before including
the file <asm/types.h>. This can be done by defining the macro in
"kerncompat.h" and making it the first included file in the relevant
header files; this fixes the compiler warnings on PPC64.

Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Wade Cline <clinew@linux.vnet.ibm.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/kerncompat.h b/kerncompat.h
index 46236cd5..d60f7222 100644
--- a/kerncompat.h
+++ b/kerncompat.h
@@ -18,6 +18,7 @@
 
 #ifndef __KERNCOMPAT
 #define __KERNCOMPAT
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>
@@ -57,11 +58,22 @@
 #endif
 
 #ifndef __CHECKER__
+/*
+ * Since we're using primitive definitions from kernel-space, we need to
+ * define __KERNEL__ so that system header files know which definitions
+ * to use.
+ */
+#define __KERNEL__
 #include <asm/types.h>
 typedef __u32 u32;
 typedef __u64 u64;
 typedef __u16 u16;
 typedef __u8 u8;
+/*
+ * Continuing to define __KERNEL__ breaks others parts of the code, so
+ * we can just undefine it now that we have the correct headers...
+ */
+#undef __KERNEL__
 #else
 typedef unsigned int u32;
 typedef unsigned int __u32;