[PATCH v3 9/9] um: Fix -Wmissing-prototypes warnings for __warp_* and foo

[Tiwei Bie]

These functions are not called explicitly. Let's just workaround
the -Wmissing-prototypes warnings by declaring them locally similar
to what was done in arch/x86/kernel/asm-offsets_32.c.

This will address below -Wmissing-prototypes warnings:

./arch/x86/um/shared/sysdep/kernel-offsets.h:9:6: warning: no previous 
prototype for ‘foo’ [-Wmissing-prototypes]
arch/um/os-Linux/main.c:187:7: warning: no previous prototype for 
‘__wrap_malloc’ [-Wmissing-prototypes]
arch/um/os-Linux/main.c:208:7: warning: no previous prototype for 
‘__wrap_calloc’ [-Wmissing-prototypes]
arch/um/os-Linux/main.c:222:6: warning: no previous prototype for ‘__wrap_free’ 
[-Wmissing-prototypes]
arch/x86/um/user-offsets.c:17:6: warning: no previous prototype for ‘foo’ 
[-Wmissing-prototypes]

Signed-off-by: Tiwei Bie <tiwei....@antgroup.com>
---
 arch/um/os-Linux/main.c                    | 5 +++++
 arch/x86/um/shared/sysdep/kernel-offsets.h | 3 +++
 arch/x86/um/user-offsets.c                 | 3 +++
 3 files changed, 11 insertions(+)

diff --git a/arch/um/os-Linux/main.c b/arch/um/os-Linux/main.c
index c8a42ecbd7a2..e82164f90288 100644
--- a/arch/um/os-Linux/main.c
+++ b/arch/um/os-Linux/main.c
@@ -184,6 +184,11 @@ int __init main(int argc, char **argv, char **envp)
 
 extern void *__real_malloc(int);
 
+/* workaround for -Wmissing-prototypes warnings */
+void *__wrap_malloc(int size);
+void *__wrap_calloc(int n, int size);
+void __wrap_free(void *ptr);
+
 void *__wrap_malloc(int size)
 {
        void *ret;
diff --git a/arch/x86/um/shared/sysdep/kernel-offsets.h 
b/arch/x86/um/shared/sysdep/kernel-offsets.h
index a004bffb7b8d..48de3a71f845 100644
--- a/arch/x86/um/shared/sysdep/kernel-offsets.h
+++ b/arch/x86/um/shared/sysdep/kernel-offsets.h
@@ -6,6 +6,9 @@
 #include <linux/kbuild.h>
 #include <asm/mman.h>
 
+/* workaround for a warning with -Wmissing-prototypes */
+void foo(void);
+
 void foo(void)
 {
 #include <common-offsets.h>
diff --git a/arch/x86/um/user-offsets.c b/arch/x86/um/user-offsets.c
index e54a9814ccf1..1c77d9946199 100644
--- a/arch/x86/um/user-offsets.c
+++ b/arch/x86/um/user-offsets.c
@@ -14,6 +14,9 @@
        COMMENT(#val " / sizeof(unsigned long)");       \
        DEFINE(sym, val / sizeof(unsigned long))
 
+/* workaround for a warning with -Wmissing-prototypes */
+void foo(void);
+
 void foo(void)
 {
 #ifdef __i386__
-- 
2.34.1