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From: kernel test robot <lkp@intel.com>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: kbuild-all@lists.01.org,
	Linux Memory Management List <linux-mm@kvack.org>,
	Russell King <rmk+kernel@armlinux.org.uk>,
	Ard Biesheuvel <ardb@kernel.org>,
	Abbott Liu <liuwenliang@huawei.com>,
	Florian Fainelli <f.fainelli@gmail.com>
Subject: [linux-next:master 1570/2472] mm/kasan/init.c:318:9: warning: variable 'pud' set but not used
Date: Mon, 2 Nov 2020 07:31:55 +0800
Message-ID: <202011020749.5XQ3Hfzc-lkp@intel.com> (raw)


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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   4e78c578cb987725eef1cec7d11b6437109e9a49
commit: 421015713b306e47af95d4d61cdfbd96d462e4cb [1570/2472] ARM: 9017/2: Enable KASan for ARM
config: arm-randconfig-r025-20201030 (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=421015713b306e47af95d4d61cdfbd96d462e4cb
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 421015713b306e47af95d4d61cdfbd96d462e4cb
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   mm/kasan/init.c: In function 'kasan_free_pud':
>> mm/kasan/init.c:318:9: warning: variable 'pud' set but not used [-Wunused-but-set-variable]
     318 |  pud_t *pud;
         |         ^~~
--
   In file included from include/trace/define_trace.h:103,
                    from include/trace/events/rcu.h:785,
                    from kernel/rcu/rcu.h:13,
                    from kernel/rcu/update.c:49:
   include/trace/events/rcu.h: In function 'perf_trace_rcu_torture_read':
>> include/trace/events/rcu.h:724:3: warning: 'strncpy' specified bound 8 equals destination size [-Wstringop-truncation]
     724 |   strncpy(__entry->rcutorturename, rcutorturename,
         |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     725 |    RCUTORTURENAME_LEN);
         |    ~~~~~~~~~~~~~~~~~~~
   include/trace/perf.h:66:4: note: in definition of macro 'DECLARE_EVENT_CLASS'
      66 |  { assign; }       \
         |    ^~~~~~
   include/trace/trace_events.h:79:9: note: in expansion of macro 'PARAMS'
      79 |         PARAMS(assign),         \
         |         ^~~~~~
   include/trace/events/rcu.h:11:25: note: in expansion of macro 'TRACE_EVENT'
      11 | #define TRACE_EVENT_RCU TRACE_EVENT
         |                         ^~~~~~~~~~~
   include/trace/events/rcu.h:723:2: note: in expansion of macro 'TP_fast_assign'
     723 |  TP_fast_assign(
         |  ^~~~~~~~~~~~~~
   In file included from include/trace/define_trace.h:102,
                    from include/trace/events/rcu.h:785,
                    from kernel/rcu/rcu.h:13,
                    from kernel/rcu/update.c:49:
   include/trace/events/rcu.h: In function 'trace_event_raw_event_rcu_torture_read':
>> include/trace/events/rcu.h:724:3: warning: 'strncpy' specified bound 8 equals destination size [-Wstringop-truncation]
     724 |   strncpy(__entry->rcutorturename, rcutorturename,
         |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     725 |    RCUTORTURENAME_LEN);
         |    ~~~~~~~~~~~~~~~~~~~
   include/trace/trace_events.h:695:4: note: in definition of macro 'DECLARE_EVENT_CLASS'
     695 |  { assign; }       \
         |    ^~~~~~
   include/trace/trace_events.h:79:9: note: in expansion of macro 'PARAMS'
      79 |         PARAMS(assign),         \
         |         ^~~~~~
   include/trace/events/rcu.h:11:25: note: in expansion of macro 'TRACE_EVENT'
      11 | #define TRACE_EVENT_RCU TRACE_EVENT
         |                         ^~~~~~~~~~~
   include/trace/events/rcu.h:723:2: note: in expansion of macro 'TP_fast_assign'
     723 |  TP_fast_assign(
         |  ^~~~~~~~~~~~~~
--
   In file included from include/trace/define_trace.h:103,
                    from include/trace/events/fscache.h:533,
                    from fs/fscache/internal.h:28,
                    from fs/fscache/main.c:16:
   include/trace/events/fscache.h: In function 'perf_trace_fscache_netfs':
>> include/trace/events/fscache.h:208:7: warning: 'strncpy' specified bound 8 equals destination size [-Wstringop-truncation]
     208 |       strncpy(__entry->name, netfs->name, 8);
         |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/trace/perf.h:66:4: note: in definition of macro 'DECLARE_EVENT_CLASS'
      66 |  { assign; }       \
         |    ^~~~~~
   include/trace/trace_events.h:79:9: note: in expansion of macro 'PARAMS'
      79 |         PARAMS(assign),         \
         |         ^~~~~~
   include/trace/events/fscache.h:196:1: note: in expansion of macro 'TRACE_EVENT'
     196 | TRACE_EVENT(fscache_netfs,
         | ^~~~~~~~~~~
   include/trace/events/fscache.h:206:6: note: in expansion of macro 'TP_fast_assign'
     206 |      TP_fast_assign(
         |      ^~~~~~~~~~~~~~
   In file included from include/trace/define_trace.h:102,
                    from include/trace/events/fscache.h:533,
                    from fs/fscache/internal.h:28,
                    from fs/fscache/main.c:16:
   include/trace/events/fscache.h: In function 'trace_event_raw_event_fscache_netfs':
>> include/trace/events/fscache.h:208:7: warning: 'strncpy' specified bound 8 equals destination size [-Wstringop-truncation]
     208 |       strncpy(__entry->name, netfs->name, 8);
         |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/trace/trace_events.h:695:4: note: in definition of macro 'DECLARE_EVENT_CLASS'
     695 |  { assign; }       \
         |    ^~~~~~
   include/trace/trace_events.h:79:9: note: in expansion of macro 'PARAMS'
      79 |         PARAMS(assign),         \
         |         ^~~~~~
   include/trace/events/fscache.h:196:1: note: in expansion of macro 'TRACE_EVENT'
     196 | TRACE_EVENT(fscache_netfs,
         | ^~~~~~~~~~~
   include/trace/events/fscache.h:206:6: note: in expansion of macro 'TP_fast_assign'
     206 |      TP_fast_assign(
         |      ^~~~~~~~~~~~~~

vim +/pud +318 mm/kasan/init.c

0207df4fa1a8692 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17  315  
0207df4fa1a8692 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17  316  static void kasan_free_pud(pud_t *pud_start, p4d_t *p4d)
0207df4fa1a8692 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17  317  {
0207df4fa1a8692 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17 @318  	pud_t *pud;
0207df4fa1a8692 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17  319  	int i;
0207df4fa1a8692 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17  320  
0207df4fa1a8692 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17  321  	for (i = 0; i < PTRS_PER_PUD; i++) {
0207df4fa1a8692 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17  322  		pud = pud_start + i;
0207df4fa1a8692 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17  323  		if (!pud_none(*pud))
0207df4fa1a8692 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17  324  			return;
0207df4fa1a8692 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17  325  	}
0207df4fa1a8692 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17  326  
0207df4fa1a8692 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17  327  	pud_free(&init_mm, (pud_t *)page_to_virt(p4d_page(*p4d)));
0207df4fa1a8692 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17  328  	p4d_clear(p4d);
0207df4fa1a8692 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17  329  }
0207df4fa1a8692 mm/kasan/kasan_init.c Andrey Ryabinin 2018-08-17  330  

:::::: The code at line 318 was first introduced by commit
:::::: 0207df4fa1a869281ddbf72db6203dbf036b3e1a kernel/memremap, kasan: make ZONE_DEVICE with work with KASAN

:::::: TO: Andrey Ryabinin <aryabinin@virtuozzo.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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             reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-01 23:31 kernel test robot [this message]
2020-11-03  0:17 ` Linus Walleij
2020-11-03  8:22   ` Ard Biesheuvel
2020-11-06  8:53     ` Linus Walleij

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