linux-kernel - Re: [PATCH] arm64/crypto: fix makefile rule for aes-glue-%.o

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Message-ID: <20140724204526.GA11754@ravnborg.org>
Date:	Thu, 24 Jul 2014 22:45:26 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:	Andreas Schwab <schwab@...e.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64/crypto: fix makefile rule for aes-glue-%.o

On Thu, Jul 24, 2014 at 09:25:13PM +0200, Ard Biesheuvel wrote:
> On 24 July 2014 18:12, Sam Ravnborg <sam@...nborg.org> wrote:
> > On Thu, Jul 24, 2014 at 04:24:48PM +0200, Ard Biesheuvel wrote:
> >> On 24 July 2014 16:18, Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:
> >> > On 24 July 2014 15:40, Andreas Schwab <schwab@...e.de> wrote:
> >> >> Ard Biesheuvel <ard.biesheuvel@...aro.org> writes:
> >> >>
> >> >>> On 24 July 2014 15:26, Andreas Schwab <schwab@...e.de> wrote:
> >> >>>> You are not using CONFIG_MODVERSIONS.
> >> >>>>
> >> >>>
> >> >>> I am
> >> >>
> >> >> No, you aren't, since you say that your .cmd contains a command to
> >> >> create aes-glue-ce.o, which with CONFIG_MODVERSIONS it doesn't.
> >> >>
> >> >
> >> > OK, you're right, it contains a command to create .tmp_aes-glue-ce.o.
> >> > But I am still not seeing the error you are seeing, strangely enough.
> >>
> >> OK, now I am seeing it.
> >>
> >> Acked-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> >
> > Jumping in the end of the thread here - sorry for that.
> >
> 
> No worries
> 
> > Another way to solve this would be to create two
> > small wrapper files:
> > aes-glue-neon.c - which include aes-glue.c
> > aes-glue-ce.c that include aes-glue.c
> >
> > Then you could use standard kbuild support for building your module.
> > And we will not potentially break it when we change cc_o_c in the near future.
> >
> 
> I see how that would fix this issue, but frankly, if we need to add .c
> files that only #include other .c files to support building multiple
> objects from a single .c file, I think the flaw is in the build
> system, and I would rather fix the build system instead.
The kbuild syntax could be extended to allow building multiple .o files from
a single .c file. But the need for this feature is so seldom that
people would not recognize the syntax most likely.

Btw. the current solution is already faulty - even with the fix.
There are no support for make C=2 arch/.../crypto/

Therefore - for now the correct fix is to use two wrapper .c files,
and accept this. It will not have the C=2 problem above.

	Sam
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