[PATCH] asm-generic: add EMAXERRNO

[Arnd Bergmann <arnd@arndb.de>]

Some architectures want to flag error returns from a syscall based on
the return value. The range from zero to -511 is for errors that
we can return to user space, so add a #define for this to
include/asm-generic/errno.h.

Reported-by: Chen Liquin <liqin.chen@sunplusct.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 include/asm-generic/errno.h |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

On Monday 15 June 2009, liqin.chen@sunplusct.com wrote:

> Maybe I can don't use EMAXERRNO in score code. But I think define a 
> maximum error number in asm-generic/errno.h is better.
> 

How about this one?

diff --git a/include/asm-generic/errno.h b/include/asm-generic/errno.h
index e8852c0..16bb31d 100644
--- a/include/asm-generic/errno.h
+++ b/include/asm-generic/errno.h
@@ -106,4 +106,8 @@
 #define	EOWNERDEAD	130	/* Owner died */
 #define	ENOTRECOVERABLE	131	/* State not recoverable */
 
+#ifdef __KERNEL__
+#define	EMAXERRNO	511	/* maximum errno value we return to user */
+#endif
+
 #endif
-- 
1.6.3.1