linux-kernel - [tip:WIP.sched/core 146/151] mm/kasan/report.c:117:26: error: 'init_thread

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Date:   Sun, 5 Feb 2017 21:47:15 +0800
From:   kbuild test robot <fengguang.wu@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org, tipbuild@...or.com
Subject: [tip:WIP.sched/core 146/151] mm/kasan/report.c:117:26: error:
 'init_thread_union' undeclared

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.sched/core
head:   b992c433b3544d3afd09c4ea603768e6486a3e29
commit: 0d1beec2508cb38715070f5a141815e7bea8482d [146/151] sched/headers: Move 'init_task' and 'init_thread_union' from <linux/sched.h> to <linux/sched/fork.h>
config: x86_64-allmodconfig (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 0d1beec2508cb38715070f5a141815e7bea8482d
        # save the attached .config to linux build tree
        make ARCH=x86_64 

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

   include/linux/compiler.h:253:8: sparse: attribute 'no_sanitize_address': unknown attribute
   mm/kasan/report.c:117:33: sparse: undefined identifier 'init_thread_union'
   mm/kasan/report.c:117:25: sparse: cast from unknown type
   mm/kasan/report.c:117:21: sparse: incompatible types for operation (>=)
   mm/kasan/report.c:117:21:    left side has type void const *addr
   mm/kasan/report.c:117:21:    right side has type bad type
   mm/kasan/report.c:118:35: sparse: undefined identifier 'init_thread_union'
   mm/kasan/report.c:118:27: sparse: cast from unknown type
   mm/kasan/report.c:119:32: sparse: undefined identifier 'init_thread_union'
   mm/kasan/report.c: In function 'init_task_stack_addr':
>> mm/kasan/report.c:117:26: error: 'init_thread_union' undeclared (first use in this function)
     return addr >= (void *)&init_thread_union.stack &&
                             ^~~~~~~~~~~~~~~~~
   mm/kasan/report.c:117:26: note: each undeclared identifier is reported only once for each function it appears in
>> mm/kasan/report.c:120:1: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^

sparse warnings: (new ones prefixed by >>)

   include/linux/compiler.h:253:8: sparse: attribute 'no_sanitize_address': unknown attribute
   mm/kasan/report.c:117:33: sparse: undefined identifier 'init_thread_union'
>> mm/kasan/report.c:117:25: sparse: cast from unknown type
>> mm/kasan/report.c:117:21: sparse: incompatible types for operation (>=)
   mm/kasan/report.c:117:21:    left side has type void const *addr
   mm/kasan/report.c:117:21:    right side has type bad type
   mm/kasan/report.c:118:35: sparse: undefined identifier 'init_thread_union'
   mm/kasan/report.c:118:27: sparse: cast from unknown type
   mm/kasan/report.c:119:32: sparse: undefined identifier 'init_thread_union'
   mm/kasan/report.c: In function 'init_task_stack_addr':
   mm/kasan/report.c:117:26: error: 'init_thread_union' undeclared (first use in this function)
     return addr >= (void *)&init_thread_union.stack &&
                             ^~~~~~~~~~~~~~~~~
   mm/kasan/report.c:117:26: note: each undeclared identifier is reported only once for each function it appears in
   mm/kasan/report.c:120:1: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^

vim +/init_thread_union +117 mm/kasan/report.c

527f215b Aneesh Kumar K.V 2015-11-05  111  		return true;
527f215b Aneesh Kumar K.V 2015-11-05  112  	return false;
bebf56a1 Andrey Ryabinin  2015-02-13  113  }
bebf56a1 Andrey Ryabinin  2015-02-13  114  
bebf56a1 Andrey Ryabinin  2015-02-13  115  static inline bool init_task_stack_addr(const void *addr)
bebf56a1 Andrey Ryabinin  2015-02-13  116  {
bebf56a1 Andrey Ryabinin  2015-02-13 @117  	return addr >= (void *)&init_thread_union.stack &&
bebf56a1 Andrey Ryabinin  2015-02-13  118  		(addr <= (void *)&init_thread_union.stack +
bebf56a1 Andrey Ryabinin  2015-02-13  119  			sizeof(init_thread_union.stack));
bebf56a1 Andrey Ryabinin  2015-02-13 @120  }
bebf56a1 Andrey Ryabinin  2015-02-13  121  
7e088978 Andrey Ryabinin  2016-08-02  122  static DEFINE_SPINLOCK(report_lock);
7e088978 Andrey Ryabinin  2016-08-02  123  

:::::: The code at line 117 was first introduced by commit
:::::: bebf56a1b176c2e1c9efe44e7e6915532cc682cf kasan: enable instrumentation of global variables

:::::: TO: Andrey Ryabinin <a.ryabinin@...sung.com>
:::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>

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