Move relevant declarations to this header. This will address
below -Wmissing-prototypes warnings:
arch/um/os-Linux/elf_aux.c:26:13: warning: no previous prototype for ‘scan_elf_aux’ [-Wmissing-prototypes]
arch/um/os-Linux/mem.c:213:13: warning: no previous prototype for ‘check_tmpexec’ [-Wmissing-prototypes]
arch/um/os-Linux/skas/process.c:107:6: warning: no previous prototype for ‘wait_stub_done’ [-Wmissing-prototypes]
Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com>
---
arch/um/os-Linux/internal.h | 20 ++++++++++++++++++++
arch/um/os-Linux/main.c | 2 --
arch/um/os-Linux/skas/mem.c | 2 --
arch/um/os-Linux/start_up.c | 2 --
arch/um/scripts/Makefile.rules | 3 ++-
5 files changed, 22 insertions(+), 7 deletions(-)
create mode 100644 arch/um/os-Linux/internal.h
diff --git a/arch/um/os-Linux/internal.h b/arch/um/os-Linux/internal.h
new file mode 100644
index 000000000000..2a0ea7853658
--- /dev/null
+++ b/arch/um/os-Linux/internal.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __UM_OS_LINUX_INTERNAL_H
+#define __UM_OS_LINUX_INTERNAL_H
+
+/*
+ * elf_aux.c
+ */
+extern void scan_elf_aux(char **envp);
+
+/*
+ * mem.c
+ */
+extern void check_tmpexec(void);
+
+/*
+ * skas/process.c
+ */
+extern void wait_stub_done(int pid);
+
+#endif /* __UM_OS_LINUX_INTERNAL_H */
diff --git a/arch/um/os-Linux/main.c b/arch/um/os-Linux/main.c
index e82164f90288..9880cfcb9b8a 100644
--- a/arch/um/os-Linux/main.c
+++ b/arch/um/os-Linux/main.c
@@ -102,8 +102,6 @@ static void setup_env_path(void)
}
}
-extern void scan_elf_aux( char **envp);
-
int __init main(int argc, char **argv, char **envp)
{
char **new_argv;
diff --git a/arch/um/os-Linux/skas/mem.c b/arch/um/os-Linux/skas/mem.c
index 953fb10f3f93..1b0502fb5c75 100644
--- a/arch/um/os-Linux/skas/mem.c
+++ b/arch/um/os-Linux/skas/mem.c
@@ -20,8 +20,6 @@
extern char batch_syscall_stub[], __syscall_stub_start[];
-extern void wait_stub_done(int pid);
-
static inline unsigned long *check_init_stack(struct mm_id * mm_idp,
unsigned long *stack)
{
diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c
index 6b21061c431c..f920c837428e 100644
--- a/arch/um/os-Linux/start_up.c
+++ b/arch/um/os-Linux/start_up.c
@@ -222,8 +222,6 @@ static void __init check_ptrace(void)
check_sysemu();
}
-extern void check_tmpexec(void);
-
static void __init check_coredump_limit(void)
{
struct rlimit lim;
diff --git a/arch/um/scripts/Makefile.rules b/arch/um/scripts/Makefile.rules
index a8b7d9dab0a6..b8ea5f3bb1fb 100644
--- a/arch/um/scripts/Makefile.rules
+++ b/arch/um/scripts/Makefile.rules
@@ -9,7 +9,8 @@ USER_OBJS += $(filter %_user.o,$(obj-y) $(USER_SINGLE_OBJS))
USER_OBJS := $(foreach file,$(USER_OBJS),$(obj)/$(file))
$(USER_OBJS:.o=.%): \
- c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) -include $(srctree)/include/linux/kern_levels.h -include user.h $(CFLAGS_$(basetarget).o)
+ c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) -include $(srctree)/include/linux/kern_levels.h \
+ -include user.h -include $(srctree)/arch/um/os-Linux/internal.h $(CFLAGS_$(basetarget).o)
# These are like USER_OBJS but filter USER_CFLAGS through unprofile instead of
# using it directly.
--
2.34.1
On Tue, 2024-04-23 at 19:24 +0800, Tiwei Bie wrote: > > $(USER_OBJS:.o=.%): \ > - c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) -include $(srctree)/include/linux/kern_levels.h -include user.h $(CFLAGS_$(basetarget).o) > + c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) -include $(srctree)/include/linux/kern_levels.h \ > + -include user.h -include $(srctree)/arch/um/os-Linux/internal.h $(CFLAGS_$(basetarget).o) > Why not just include it explicitly? We do have the warnings? johannes
On 4/23/24 7:30 PM, Johannes Berg wrote:
> On Tue, 2024-04-23 at 19:24 +0800, Tiwei Bie wrote:
>>
>> $(USER_OBJS:.o=.%): \
>> - c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) -include $(srctree)/include/linux/kern_levels.h -include user.h $(CFLAGS_$(basetarget).o)
>> + c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) -include $(srctree)/include/linux/kern_levels.h \
>> + -include user.h -include $(srctree)/arch/um/os-Linux/internal.h $(CFLAGS_$(basetarget).o)
>>
>
> Why not just include it explicitly?
I think it might be more convenient if we include it implicitly,
especially since there are two levels of directories under os-Linux/.
But I don't have a strong opinion on this. I'm also willing to
include it explicitly.
> We do have the warnings?
Yeah. Without this patch, I can get below warnings with `make ARCH=um defconfig && make ARCH=um`:
arch/um/os-Linux/skas/process.c:107:6: warning: no previous prototype for ‘wait_stub_done’ [-Wmissing-prototypes]
107 | void wait_stub_done(int pid)
| ^~~~~~~~~~~~~~
arch/um/os-Linux/mem.c:213:13: warning: no previous prototype for ‘check_tmpexec’ [-Wmissing-prototypes]
213 | void __init check_tmpexec(void)
| ^~~~~~~~~~~~~
And below warnings with `make ARCH=um SUBARCH=i386 defconfig && make ARCH=um SUBARCH=i386`:
arch/um/os-Linux/elf_aux.c:26:13: warning: no previous prototype for ‘scan_elf_aux’ [-Wmissing-prototypes]
26 | __init void scan_elf_aux( char **envp)
| ^~~~~~~~~~~~
arch/um/os-Linux/skas/process.c:107:6: warning: no previous prototype for ‘wait_stub_done’ [-Wmissing-prototypes]
107 | void wait_stub_done(int pid)
| ^~~~~~~~~~~~~~
arch/um/os-Linux/mem.c:213:13: warning: no previous prototype for ‘check_tmpexec’ [-Wmissing-prototypes]
213 | void __init check_tmpexec(void)
| ^~~~~~~~~~~~~
The compiler I'm using is: gcc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0
Regards,
Tiwei
On Tue, 2024-04-23 at 20:09 +0800, Tiwei Bie wrote: > On 4/23/24 7:30 PM, Johannes Berg wrote: > > On Tue, 2024-04-23 at 19:24 +0800, Tiwei Bie wrote: > > > > > > $(USER_OBJS:.o=.%): \ > > > - c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) -include $(srctree)/include/linux/kern_levels.h -include user.h $(CFLAGS_$(basetarget).o) > > > + c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) -include $(srctree)/include/linux/kern_levels.h \ > > > + -include user.h -include $(srctree)/arch/um/os-Linux/internal.h $(CFLAGS_$(basetarget).o) > > > > > > > Why not just include it explicitly? > > I think it might be more convenient if we include it implicitly, > especially since there are two levels of directories under os-Linux/. > But I don't have a strong opinion on this. I'm also willing to > include it explicitly. Yeah, ok, dunno. > > We do have the warnings? > > Yeah. Without this patch, I can get below warnings with `make ARCH=um defconfig && make ARCH=um`: > Sure. I meant, we don't need to hide the include, if we need to add it to some other file, we'll have the warnings as a reminder. :) I don't think anyone today would write the code as it is now ... johannes
On 4/23/24 8:22 PM, Johannes Berg wrote: > On Tue, 2024-04-23 at 20:09 +0800, Tiwei Bie wrote: >> On 4/23/24 7:30 PM, Johannes Berg wrote: >>> On Tue, 2024-04-23 at 19:24 +0800, Tiwei Bie wrote: >>>> >>>> $(USER_OBJS:.o=.%): \ >>>> - c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) -include $(srctree)/include/linux/kern_levels.h -include user.h $(CFLAGS_$(basetarget).o) >>>> + c_flags = -Wp,-MD,$(depfile) $(USER_CFLAGS) -include $(srctree)/include/linux/kern_levels.h \ >>>> + -include user.h -include $(srctree)/arch/um/os-Linux/internal.h $(CFLAGS_$(basetarget).o) >>>> >>> >>> Why not just include it explicitly? >> >> I think it might be more convenient if we include it implicitly, >> especially since there are two levels of directories under os-Linux/. >> But I don't have a strong opinion on this. I'm also willing to >> include it explicitly. > > Yeah, ok, dunno. > >>> We do have the warnings? >> >> Yeah. Without this patch, I can get below warnings with `make ARCH=um defconfig && make ARCH=um`: >> > > Sure. I meant, we don't need to hide the include, if we need to add it > to some other file, we'll have the warnings as a reminder. :) > > I don't think anyone today would write the code as it is now ... Makes sense. Will include it explicitly. Thanks! Regards, Tiwei
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