linux-kernel - Re: [PATCH] kbuild: Do not run modules

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Date:	Mon, 07 Jul 2014 13:03:39 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Andy Lutomirski <luto@...capital.net>
CC:	"H. Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
	"linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kbuild: Do not run modules_install and install in paralel

On 2014-07-05 01:45, Andy Lutomirski wrote:
> On Fri, Jul 4, 2014 at 3:15 PM, Michal Marek <mmarek@...e.cz> wrote:
>> Dne 13.6.2014 19:29, Andy Lutomirski napsal(a):
>>> On Fri, Jun 13, 2014 at 2:45 AM, Michal Marek <mmarek@...e.cz> wrote:
>>>> Dne 13.6.2014 11:39, Michal Marek napsal(a):
>>>>> Based on a x86-only patch by Andy Lutomirski <luto@...capital.net>
>>>>>
>>>>> With modular kernels, 'make install' is going to need the installed
>>>>> modules at some point to generate the initramfs.
>>>>>
>>>>> Signed-off-by: Michal Marek <mmarek@...e.cz>
>>>>> ---
>>>>>  Makefile | 6 ++++++
>>>>>  1 file changed, 6 insertions(+)
>>>>>
>>>>> diff --git a/Makefile b/Makefile
>>>>> index 7680d7c..7e5e483 100644
>>>>> --- a/Makefile
>>>>> +++ b/Makefile
>>>>> @@ -503,6 +503,12 @@ ifeq ($(KBUILD_EXTMOD),)
>>>>>                  endif
>>>>>          endif
>>>>>  endif
>>>>> +# install and module_install need also be processed one by one
>>>>> +ifneq ($(filter install,$(MAKECMDGOALS)),)
>>>>> +        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
>>>>> +             mixed-targets := 1
>>>>> +        endif
>>>>> +endif
>>>>
>>>> Note that this version does not enforce the ordering, it just avoids the
>>>> interleaved execution. It can be added if desired.
>>>
>>> Hmm.  This will fix 'make modules_install install' but will not fix
>>> 'make install modules_install'.  I don't know how many people would
>>> type the latter.
>>
>> Resuming a thread from last month -- As I said, it does not enforce the
>> ordering. So it's not as bullet-proof as your patch, but it works on all
>> architectures. I'm thinking about adding the patch to kbuild.git for
>> 3.17. But if you want to fix the ordering as well, feel free to change
>> the __build_one_by_one rule to do this.
> 
> Sounds good to me.
> 
> Where's __build_one_by_one?

A few lines below in the main Makefile:

   513  ifeq ($(mixed-targets),1)
   514  #
======================================================================
=====
   515  # We're called with mixed targets (*config and build targets).
   516  # Handle them one by one.
   517
   518  PHONY += $(MAKECMDGOALS) __build_one_by_one
   519
   520  $(filter-out __build_one_by_one, $(MAKECMDGOALS)):
__build_one_by_one
   521          @:
   522
   523  __build_one_by_one:
   524          $(Q)set -e; \
   525          for i in $(MAKECMDGOALS); do \
   526                  $(MAKE) -f $(srctree)/Makefile $$i; \
   527          done

Michal
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