linux-kernel - Re: include/linux/bug.h:93:12: error: dereferencing pointer to incomplete type

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Message-Id: <20160229124937.984ac318110f686d96532088@linux-foundation.org>
Date:	Mon, 29 Feb 2016 12:49:37 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	kbuild test robot <fengguang.wu@...el.com>
Cc:	Josh Triplett <josh@...htriplett.org>, kbuild-all@...org,
	linux-kernel@...r.kernel.org,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: include/linux/bug.h:93:12: error: dereferencing pointer to
 incomplete type

On Mon, 29 Feb 2016 07:33:04 +0800 kbuild test robot <fengguang.wu@...el.com> wrote:

> FYI, the error/warning still remains.
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   fc77dbd34c5c99bce46d40a2491937c3bcbd10af
> commit: 5d2acfc7b974bbd3858b4dd3f2cdc6362dd8843a kconfig: make allnoconfig disable options behind EMBEDDED and EXPERT
> date:   1 year, 11 months ago
> config: mn10300-allnoconfig (attached as .config)
> reproduce:
>         wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         git checkout 5d2acfc7b974bbd3858b4dd3f2cdc6362dd8843a
>         # save the attached .config to linux build tree
>         make.cross ARCH=mn10300 
> 

From: Andrew Morton <akpm@...ux-foundation.org>
Subject: mn10300, c6x: CONFIG_GENERIC_BUG must depend on CONFIG_BUG

CONFIG_BUG=n && CONFIG_GENERIC_BUG=y make no sense and things break:

   In file included from include/linux/page-flags.h:9:0,
                    from kernel/bounds.c:9:
   include/linux/bug.h:91:47: warning: 'struct bug_entry' declared inside parameter list
    static inline int is_warning_bug(const struct bug_entry *bug)
                                                  ^
   include/linux/bug.h:91:47: warning: its scope is only this definition or declaration, which is probably not what you want
   include/linux/bug.h: In function 'is_warning_bug':
>> include/linux/bug.h:93:12: error: dereferencing pointer to incomplete type
     return bug->flags & BUGFLAG_WARNING;

Reported-by: kbuild test robot <fengguang.wu@...el.com>
Cc: Josh Triplett <josh@...htriplett.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 arch/c6x/Kconfig     |    1 +
 arch/mn10300/Kconfig |    1 +
 2 files changed, 2 insertions(+)

diff -puN arch/c6x/Kconfig~mn10300-c6x-config_generic_bug-must-depend-on-config_bug arch/c6x/Kconfig
--- a/arch/c6x/Kconfig~mn10300-c6x-config_generic_bug-must-depend-on-config_bug
+++ a/arch/c6x/Kconfig
@@ -36,6 +36,7 @@ config GENERIC_HWEIGHT
 
 config GENERIC_BUG
 	def_bool y
+	depends on BUG
 
 config C6X_BIG_KERNEL
 	bool "Build a big kernel"
diff -puN arch/mn10300/Kconfig~mn10300-c6x-config_generic_bug-must-depend-on-config_bug arch/mn10300/Kconfig
--- a/arch/mn10300/Kconfig~mn10300-c6x-config_generic_bug-must-depend-on-config_bug
+++ a/arch/mn10300/Kconfig
@@ -53,6 +53,7 @@ config GENERIC_HWEIGHT
 
 config GENERIC_BUG
 	def_bool y
+	depends on BUG
 
 config QUICKLIST
 	def_bool y
_