linux-kernel - [PATCH] let ERR_PTR BUILD_BUG_ON when we know its argument is not a valid errno

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Message-ID: <20080511201209.GO19058@joi>
Date:	Sun, 11 May 2008 22:12:14 +0200
From:	Marcin Slusarz <marcin.slusarz@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Andrew Morton <akpm@...l.org>
Subject: [PATCH] let ERR_PTR BUILD_BUG_ON when we know its argument is not
	a valid errno

Signed-off-by: Marcin Slusarz <marcin.slusarz@...il.com>
Cc: Andrew Morton <akpm@...l.org>
---
allmodconfig compile tested (on x86_64)

should be applied after:
net/sunrpc/xprtrdma: fix svc_rdma_create out of memory error path
jfs: 0 is not valid errno value
---
 include/linux/err.h |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/include/linux/err.h b/include/linux/err.h
--- a/include/linux/err.h
+++ b/include/linux/err.h
@@ -19,11 +19,13 @@
 
 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
 
-static inline void *ERR_PTR(long error)
+static inline void *__ERR_PTR(long error)
 {
 	return (void *) error;
 }
 
+#define ERR_PTR(error) (BUILD_BUG_ON(!IS_ERR_VALUE(error)), __ERR_PTR(error))
+
 static inline long PTR_ERR(const void *ptr)
 {
 	return (long) ptr;
-- 
--
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