[PATCH 1/5] Add an errno validation function (v2)

[Dan Smith <danms-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>]

Signed-off-by: Dan Smith <danms-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>

Changes in v2:
  - Compare against MAX_ERRNO instead of more stringent but obscure
    constant
---
 include/linux/checkpoint.h |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/include/linux/checkpoint.h b/include/linux/checkpoint.h
index 45cf0fe..87b683b 100644
--- a/include/linux/checkpoint.h
+++ b/include/linux/checkpoint.h
@@ -28,7 +28,7 @@
 #include <linux/user_namespace.h>
 #include <linux/checkpoint_types.h>
 #include <linux/checkpoint_hdr.h>
-
+#include <linux/err.h>
 
 /* ckpt_ctx: kflags */
 #define CKPT_CTX_CHECKPOINT_BIT		0
@@ -267,6 +267,10 @@ extern void *restore_sighand(struct ckpt_ctx *ctx);
 			memcpy(LIVE, SAVE, count * sizeof(*SAVE));	\
 	} while (0)
 
+static inline int ckpt_validate_errno(int errno)
+{
+	return (errno >= 0) && (errno < MAX_ERRNO);
+}
 
 /* debugging flags */
 #define CKPT_DBASE	0x1		/* anything */
-- 
1.6.2.5