From 285d451f5c3e034463ea49a5ba99e8e0eb1b83a2 Mon Sep 17 00:00:00 2001
From: Jens Axboe <jens.axboe@oracle.com>
Date: Mon, 15 Mar 2010 13:38:11 +0100
Subject: [PATCH] Check for syscall definitions, before declaring __weak helper

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---
 helpers.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/helpers.c b/helpers.c
index 779f9fbe..c6953318 100644
--- a/helpers.c
+++ b/helpers.c
@@ -3,14 +3,17 @@
 #include <sys/socket.h>
 #include <sys/time.h>
 #include <netinet/in.h>
+#include <unistd.h>
 
 #include "compiler/compiler.h"
 #include "os/os.h"
 
+#ifndef __NR_fallocate
 int __weak posix_fallocate(int fd, off_t offset, off_t len)
 {
 	return 0;
 }
+#endif
 
 int __weak inet_aton(const char *cp, struct in_addr *inp)
 {
@@ -30,8 +33,11 @@ int __weak clock_gettime(clockid_t clk_id, struct timespec *ts)
 	return ret;
 }
 
+#ifndef __NR_sync_file_range
 int __weak sync_file_range(int fd, off64_t offset, off64_t nbytes,
 			   unsigned int flags)
 {
-	return 0;
+	errno = ENOSYS;
+	return -1;
 }
+#endif
-- 
2.25.1