linux-kernel - Re: [PATCH 1/3] kbuild: Make targets names tree-wide unique on x86

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Date:	Sun, 14 Sep 2014 22:09:53 +0400
From:	Kirill Tkhai <tkhai@...dex.ru>
To:	Peter Foley <pefoley2@...oley.com>
CC:	Michal Marek <mmarek@...e.cz>, arnd@...db.de,
	linux-kbuild@...r.kernel.org, gregkh@...uxfoundation.org,
	LKML <linux-kernel@...r.kernel.org>, oleg@...hat.com,
	grant.likely@...retlab.ca, ebiederm@...ssion.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	ktkhai@...allels.com, Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH 1/3] kbuild: Make targets names tree-wide unique on x86

On 14.09.2014 19:57, Peter Foley wrote:
> On Sun, Sep 14, 2014 at 6:18 AM, Kirill Tkhai <tkhai@...dex.ru> wrote:
>> diff --git a/init/Makefile b/init/Makefile
>> index 7bc47ee..566a9ff 100644
>> --- a/init/Makefile
>> +++ b/init/Makefile
>> @@ -2,23 +2,28 @@
>>  # Makefile for the linux kernel.
>>  #
>>
>> -obj-y                          := main.o version.o mounts.o
>> +obj-y                          := main.o version.o do_mounts.o
>> +
>>  ifneq ($(CONFIG_BLK_DEV_INITRD),y)
>>  obj-y                          += noinitramfs.o
>>  else
>> -obj-$(CONFIG_BLK_DEV_INITRD)   += initramfs.o
>> +obj-y                          += initramfs.o do_mounts_initrd.o
>> +endif
>> +
>> +ifeq ($(CONFIG_BLK_DEV_RAM),y)
>> +obj-y                          += do_mounts_rd.o
>>  endif
>> +
>> +ifeq ($(CONFIG_BLK_DEV_MD),y)
>> +obj-y                          += do_mounts_md.o
>> +endif
>> +
>>  obj-$(CONFIG_GENERIC_CALIBRATE_DELAY) += calibrate.o
>>
>>  ifneq ($(CONFIG_ARCH_INIT_TASK),y)
>>  obj-y                          += init_task.o
>>  endif
>>
>> -mounts-y                       := do_mounts.o
>> -mounts-$(CONFIG_BLK_DEV_RAM)   += do_mounts_rd.o
>> -mounts-$(CONFIG_BLK_DEV_INITRD)        += do_mounts_initrd.o
>> -mounts-$(CONFIG_BLK_DEV_MD)    += do_mounts_md.o
>> -
> 
> Can't you keep the obj-$(CONFIG_*) syntax?
> e.g.
> obj-$(CONFIG_BLK_DEV_RAM) += do_mounts_rd.o
> 

They are need only in CONFIG_XXX=y case. They contain stubs
which are not compiled in case of =m. Look at rd_load_image()
for example.

So, here I prevent compilation errors, and make them uncompilable
in =m case like it used to be before.

Kirill
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