linux-kernel - Re: [PATCH] samples: build fix

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Message-ID: <20080214210630.GG21894@uranus.ravnborg.org>
Date:	Thu, 14 Feb 2008 22:06:30 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Roland McGrath <roland@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] samples: build fix

On Thu, Feb 14, 2008 at 03:04:04PM -0500, Mathieu Desnoyers wrote:
> * Sam Ravnborg (sam@...nborg.org) wrote:
> > On Thu, Feb 14, 2008 at 08:27:52AM -0500, Mathieu Desnoyers wrote:
> > > * Roland McGrath (roland@...hat.com) wrote:
> > > > 
> > > > The samples/ subdirectory contains only modules.
> > > > But the only make run done there is in commands for vmlinux.
> > > > I can't see why this was ever done in this nonstandard fashion.
> > > > As things stand, the modules don't get built by 'make modules'.
> > > > 
> > > > I didn't make the addition of the directory use core-$(CONFIG_SAMPLES)
> > > > because there is no other conditional like that in the top-level Makefile
> > > > and samples/Makefile already uses obj-$(CONFIG_SAMPLES) as if it expects
> > > > always to be included.
> > > > 
> > > 
> > > Sam, is this ok with the samples intent ? I think as long as we do not
> > > include them with the kernel image and have a "make samples" to build
> > > them, it's ok. Having them built upon make modules seems like a good
> > > idea to me.
> > 
> > The samples code are supposed to be what the name says 'samples'.
> > This is not code that are supposed to be part of the built-in kernel.
> > This is not modules that are supposed to be installes when 
> > installing modules.
> > 
> > Adding it to core-y as Roland does in the patch below is plain
> > wrong as it enabled both points above.
> > The fact that the present code in samples/ does not do this is
> > in this respect irellevant.
> > 
> > Do we have problems when to build the sampls - then lets
> > address this issue but not by trying to upgrade the samples
> > to first class citizen in the kernel - they are not that
> > and should not be handled like that.
> > 
> 
> Then is there some other way to have the samples built upon "make
> modules" that would not install them with other modules ?
The simple solution is like attached.
I do not care if they are build as part of vmlinux or modules build.
So if it is generally preferred we could move it like this.

Comments?

	Sam

diff --git a/Makefile b/Makefile
index c162370..c72afa9 100644
--- a/Makefile
+++ b/Makefile
@@ -802,9 +802,6 @@ vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o)
 ifdef CONFIG_HEADERS_CHECK
 	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
 endif
-ifdef CONFIG_SAMPLES
-	$(Q)$(MAKE) $(build)=samples
-endif
 	$(call vmlinux-modpost)
 	$(call if_changed_rule,vmlinux__)
 	$(Q)rm -f .old_version
@@ -1036,6 +1033,9 @@ all: modules
 PHONY += modules
 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
 	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
+ifdef CONFIG_SAMPLES
+	$(Q)$(MAKE) $(build)=samples
+endif
 	@echo '  Building modules, stage 2.';
 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 
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