linux-kernel - [PATCH v3 9/9] um: Fix -Wmissing-prototypes warnings for __warp

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Message-Id: <20240306101925.1088870-10-tiwei.btw@antgroup.com>
Date: Wed, 06 Mar 2024 18:19:25 +0800
From: "Tiwei Bie" <tiwei.btw@...group.com>
To: richard@....at,
	anton.ivanov@...bridgegreys.com,
	johannes@...solutions.net
Cc:  <jani.nikula@...el.com>,
   <linux-um@...ts.infradead.org>,
   <linux-kernel@...r.kernel.org>,
   <intel-xe@...ts.freedesktop.org>,
  "Tiwei Bie" <tiwei.btw@...group.com>
Subject: [PATCH v3 9/9] um: Fix -Wmissing-prototypes warnings for __warp_* and foo

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.btw@...group.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