linux-kernel - [PATCH nolibc 02/18] tools/nolibc: fix build warning in sys_mmap() when my

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Date:   Wed, 31 Aug 2022 11:21:32 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     gwml@...r.gnuweeb.org, kernel-team@...com, w@....eu,
        Willy Tarreau <w@....eu>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: [PATCH nolibc 02/18] tools/nolibc: fix build warning in sys_mmap() when my_syscall6 is not defined

From: Willy Tarreau <w@....eu>

We return -ENOSYS when there's no syscall6() operation, but we must cast
it to void* to avoid a warning.

Signed-off-by: Willy Tarreau <w@....eu>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
---
 tools/include/nolibc/sys.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h
index 08491070387bc..b8c96878c9ce0 100644
--- a/tools/include/nolibc/sys.h
+++ b/tools/include/nolibc/sys.h
@@ -692,7 +692,7 @@ void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd,
 {
 #ifndef my_syscall6
 	/* Function not implemented. */
-	return -ENOSYS;
+	return (void *)-ENOSYS;
 #else
 
 	int n;
-- 
2.31.1.189.g2e36527f23