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 14:22:00 +0200
From: Johannes Berg <johannes@...solutions.net>
To: Tiwei Bie <tiwei.btw@...group.com>, 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 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