linux-kernel - Re: [PATCH 5/7] um: Add an internal header shared among the user code

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Date: Tue, 23 Apr 2024 20:09:28 +0800
From: "Tiwei Bie" <tiwei.btw@...group.com>
To: Johannes Berg <johannes@...solutions.net>, richard@....at,
 anton.ivanov@...bridgegreys.com
Cc: linux-um@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/7] um: Add an internal header shared among the user code

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