Re: [PATCH] string.h: work around for increased stack usage

From: kbuild test robot <lkp@intel.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: kbuild-all@01.org, Andrey Ryabinin <aryabinin@virtuozzo.com>,
	David Laight <David.Laight@aculab.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	"David S . Miller" <davem@davemloft.net>,
	Alexander Potapenko <glider@google.com>,
	Dmitry Vyukov <dvyukov@google.com>,
	Masahiro Yamada <yamada.masahiro@socionext.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Kees Cook <keescook@chromium.org>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"linux-media @ vger . kernel . org" <linux-media@vger.kernel.org>,
	"linux-kernel @ vger . kernel . org"
	<linux-kernel@vger.kernel.org>,
	"kasan-dev @ googlegroups . com" <kasan-dev@googlegroups.com>,
	"linux-kbuild @ vger . kernel . org"
	<linux-kbuild@vger.kernel.org>, Arnd Bergmann <arnd@arndb.de>
Subject: Re: [PATCH] string.h: work around for increased stack usage
Date: Wed, 4 Oct 2017 02:10:22 +0800	[thread overview]
Message-ID: <201710040103.8bUbfu25%fengguang.wu@intel.com> (raw)
In-Reply-To: <20171002084119.3504771-1-arnd@arndb.de>

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Hi Arnd,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.14-rc3 next-20170929]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Arnd-Bergmann/string-h-work-around-for-increased-stack-usage/20171003-210611
config: x86_64-randconfig-ws0-10040032 (attached as .config)
compiler: gcc-4.8 (Debian 4.8.4-1) 4.8.4
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All error/warnings (new ones prefixed by >>):

   In file included from lib/string.c:23:0:
>> include/linux/string.h:235:2: error: expected identifier or '(' before 'do'
     do { \
     ^
>> lib/string.c:1048:6: note: in expansion of macro 'fortify_panic'
    void fortify_panic(const char *name)
         ^
>> include/linux/string.h:238:4: error: expected identifier or '(' before 'while'
     } while (0)
       ^
>> lib/string.c:1048:6: note: in expansion of macro 'fortify_panic'
    void fortify_panic(const char *name)
         ^

vim +235 include/linux/string.h

   231	
   232	/* work around GCC PR82365 */
   233	#if defined(CONFIG_KASAN) && !defined(__clang__) && GCC_VERSION <= 80000
   234	#define fortify_panic(x) \
 > 235		do { \
   236			asm volatile(""); \
   237			fortify_panic(x); \
 > 238		} while (0)
   239	#endif
   240	

---
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