linux-kernel - Re: [patch 2/4] syscalls, x86: Add __NR

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Date:	Wed, 15 Feb 2012 10:52:45 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Andrey Vagin <avagin@...nvz.org>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Glauber Costa <glommer@...allels.com>,
	Andi Kleen <andi@...stfloor.org>, Tejun Heo <tj@...nel.org>,
	Matt Helsley <matthltc@...ibm.com>,
	Pekka Enberg <penberg@...nel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Vasiliy Kulikov <segoon@...nwall.com>,
	Alexey Dobriyan <adobriyan@...il.com>, Valdis.Kletnieks@...edu,
	Michal Marek <mmarek@...e.cz>
Subject: Re: [patch 2/4] syscalls, x86: Add __NR_kcmp syscall v8

On Tue, Feb 14, 2012 at 03:13:12PM -0800, Andrew Morton wrote:
...
> 
> hm, what does all this stuff in the selftest makefile do?
> 
> The selftests code has undergone some changes since you last looked. 

Hmm, thanks for pointing.

> The rules are, roughly:
> 
> - In tools/testing/selftests, a "make" will compile but not run all
>   selftest code.
> 
> - In tools/testing/selftests, a "make run_tests" will compile all
>   selftest code (if needed) and will then run all the tests.
> 
>   If a test is not applicable (eg wrong architecture, kernel feature
>   not enabled, etc) then it should try to avoid breaking the build and,
>   when executed it should emit a diagnostic and then exit(0) (ie:
>   success) so as to avoid breaking the overall test run.
> 
>   IOW, the test should only fail if the feature is present but isn't
>   working correctly.
> 
> Also, I hate with a passion Makefiles which hide the command lines from
> me!  So I nuked all that E and Q stuff.
> 

make V=1 will show the command line, I tried to make the output to look
the same as in case of building kernel.

> 
> However that didn't work for me:
> 
> akpm:/usr/src/25/tools/testing/selftests/kcmp> make
> gcc -DCONFIG_X86_64 -D__x86_64__ -I../../../../arch/x86/include/generated/ ...
> kcmp_test.c: In function 'sys_kcmp':
> kcmp_test.c:22: error: '__NR_kcmp' undeclared (first use in this function)
...
> How are we supposed to be picking up __NR_kcmp?
> 

Initially I made it to look into arch/x86 directory and find __NR_kcmp
definition there but then I realised (and someone pointed me as
well) that headers should be taken from those which are generated
by kernel, ie the result of 'make headers_install'. So if you run
make headers_install then the test program should work. If this is
wrong, I can fix it and make a patch on top.

Ie instead of

+#include <linux/unistd.h>

there will be

+#ifdef CONFIG_X86_64
+#include <asm/unistd_64.h>
+#else
+#include <asm/unistd_32.h>
+#endif

	Cyrill
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