linux-kernel - Re: [PATCH v5] selftest: size: Add size test for Linux kernel

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Date:	Wed, 03 Dec 2014 14:43:11 +1100
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Tim Bird <tim.bird@...ymobile.com>
Cc:	Shuah Khan <shuahkh@....samsung.com>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
	Josh Triplett <josh@...htriplett.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-embedded@...r.kernel.org" <linux-embedded@...r.kernel.org>
Subject: Re: [PATCH v5] selftest: size: Add size test for Linux kernel

On Tue, 2014-12-02 at 19:36 -0800, Tim Bird wrote:
> This test shows the amount of memory used by the system.
> Note that this is dependent on the user-space that is loaded
> when this program runs.  Optimally, this program would be
> run as the init program itself.

Sorry to only chime in at v5.

> diff --git a/tools/testing/selftests/size/Makefile b/tools/testing/selftests/size/Makefile
> new file mode 100644
> index 0000000..47f8e9c
> --- /dev/null
> +++ b/tools/testing/selftests/size/Makefile
> @@ -0,0 +1,15 @@
> +#ifndef CC
> +	CC = $(CROSS_COMPILE)gcc
> +#endif

I think the following is preferable:

  CC := $(CROSS_COMPILE)$(CC)


It allows optionally setting a custom CC, as well as optionally CROSS_COMPILE.

The only thing it doesn't do is choose gcc explicitly, but you shouldn't really
do that anyway - unless you absolutely require gcc. Let the user choose their
compiler by choosing where cc points.

cheers



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