linux-kernel - Re: [PATCH 1/2] radix tree test suite: include kconfig.h with incomplete path

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Message-ID: <20240729015320.p6ef54kdcgnrgkyh@master>
Date: Mon, 29 Jul 2024 01:53:20 +0000
From: Wei Yang <richard.weiyang@...il.com>
To: Wei Yang <richard.weiyang@...il.com>
Cc: "Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Matthew Wilcox <willy@...radead.org>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] radix tree test suite: include kconfig.h with
 incomplete path

On Wed, Jul 17, 2024 at 12:34:32AM +0000, Wei Yang wrote:
>On Tue, Jul 16, 2024 at 11:54:47AM -0400, Liam R. Howlett wrote:
>>* Wei Yang <richard.weiyang@...il.com> [240716 03:56]:
>>> On Tue, Jul 16, 2024 at 03:31:06AM +0100, Matthew Wilcox wrote:
>>> >On Tue, Jul 16, 2024 at 02:15:43AM +0000, Wei Yang wrote:
>>> >> If you think my understanding is correct, I would send a v2 with proper
>>> >> changelog to describe it.
>>> >
>>> >It seems like you're trying to change something that isn't broken.
>>> 
>>> Currently we don't find the problem because these two kconfig.h is similar.
>>> The only difference is the one in tools/ doesn't include "generated/autoconf.h".
>>
>>We need that include.
>>
>
>I see your point, but I find current code has a chance not does do this.
>
>>> 
>>> And in related files, like include/linux/xarray.h, includes the correct
>>> kconfig.h.
>>> 
>>> It is not broken, but doesn't mean it is correct, IMO.
>>
>>This is really annoying because it works today and your change was
>>correct enough to look right, but it doesn't include the
>>generated/autoconf.h  - so it's not right.  It took a lot of time to
>>figure out that it isn't right.
>>
>
>I am not sure you have read my second mail.
>
>Here is what I find.
>
>I add a warning in tools/include/linux/kconfig.h.
>
>diff --git a/tools/include/linux/kconfig.h b/tools/include/linux/kconfig.h
>index 13b86bd3b746..12d3ed5f16b2 100644
>--- a/tools/include/linux/kconfig.h
>+++ b/tools/include/linux/kconfig.h
>@@ -2,6 +2,8 @@
> #ifndef _TOOLS_LINUX_KCONFIG_H
> #define _TOOLS_LINUX_KCONFIG_H
> 
>+#warning include local kconfig.h
>+
>
>Then I run the command:
>
>$make maple.o
>cc -I. -I../../include -I../../../lib -g -Og -Wall -D_LGPL_SOURCE -fsanitize=address -fsanitize=undefined   -c -o maple.o maple.c
>In file included from ./linux/kernel.h:14,
>                 from ../../include/linux/list.h:7,
>                 from ./linux/../../../../include/linux/radix-tree.h:13,
>                 from ./linux/radix-tree.h:5,
>                 from test.h:4,
>                 from maple.c:11:
>./linux/../../../include/linux/kconfig.h:5:2: warning: #warning include local kconfig.h [-Wcpp]
>    5 | #warning include local kconfig.h
>      |  ^~~~~~~
>
>This means current code may include tools/include/linux/kconfig.h, which doesn't
>include generated/autoconf.h.
>

Liam,

Do you think what I found is real?

Look forward your insight.

>After I change to <linux/kconfig.h> in kernel.h, the warning message is gone.
>
>Current behavior is not what you expected, right? We have a chance to include
>the kconfig.h which doesn't include generated/autoconf.h. 
>
>Hope not waste your time.
>
>-- 
>Wei Yang
>Help you, Help me

-- 
Wei Yang
Help you, Help me