[PATCH] s390: fadvise hint values.

Add special case for the POSIX_FADV_DONTNEED and POSIX_FADV_NOREUSE hint
values for s390-64.  The user space values in the s390-64 glibc headers for
these two defines have always been 6 and 7 instead of 4 and 5.  All 64 bit
applications therefore use the "wrong" values.  To get these applications
working without recompiling the kernel needs to accept the "wrong" values.
Since the values for s390-31 are 4 and 5 the compat wrapper for fadvise64
and fadvise64_64 need to rewrite the values for 31 bit system calls.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/linux/fadvise.h b/include/linux/fadvise.h
index 6fc656dfb93d..e8e747139b9a 100644
--- a/include/linux/fadvise.h
+++ b/include/linux/fadvise.h
@@ -5,7 +5,17 @@
 #define POSIX_FADV_RANDOM       1 /* Expect random page references.  */
 #define POSIX_FADV_SEQUENTIAL   2 /* Expect sequential page references.  */
 #define POSIX_FADV_WILLNEED     3 /* Will need these pages.  */
+
+/*
+ * The advise values for POSIX_FADV_DONTNEED and POSIX_ADV_NOREUSE
+ * for s390-64 differ from the values for the rest of the world.
+ */
+#if defined(__s390x__)
+#define POSIX_FADV_DONTNEED     6 /* Don't need these pages.  */
+#define POSIX_FADV_NOREUSE      7 /* Data will be accessed once.  */
+#else
 #define POSIX_FADV_DONTNEED     4 /* Don't need these pages.  */
 #define POSIX_FADV_NOREUSE      5 /* Data will be accessed once.  */
+#endif
 
 #endif  /* FADVISE_H_INCLUDED */