From: Dan Carpenter <error27@gmail.com>
To: oe-kbuild@lists.linux.dev, Eric Dumazet <edumazet@google.com>
Cc: lkp@intel.com, oe-kbuild-all@lists.linux.dev, netdev@vger.kernel.org
Subject: [net-next:master 25/27] net/core/dev.c:6409 napi_disable() error: uninitialized symbol 'new'.
Date: Thu, 17 Nov 2022 10:36:19 +0300 [thread overview]
Message-ID: <202211171520.UF5VyYSH-lkp@intel.com> (raw)
Message-ID: <20221117073619.mRaGPxq1akmk0iWLpDPM3sN_IvDoV32Xs5BB09ByQV4@z> (raw)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master
head: d82303df06481235fe7cbaf605075e0c2c87e99b
commit: 4ffa1d1c6842a97e84cfbe56bfcf70edb23608e2 [25/27] net: adopt try_cmpxchg() in napi_{enable|disable}()
config: i386-randconfig-m021
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>
New smatch warnings:
net/core/dev.c:6409 napi_disable() error: uninitialized symbol 'new'.
Old smatch warnings:
net/core/dev.c:10356 netdev_run_todo() warn: passing freed memory 'dev'
vim +/new +6409 net/core/dev.c
3b47d30396bae4 Eric Dumazet 2014-11-06 6393 void napi_disable(struct napi_struct *n)
3b47d30396bae4 Eric Dumazet 2014-11-06 6394 {
719c571970109b Jakub Kicinski 2021-09-24 6395 unsigned long val, new;
719c571970109b Jakub Kicinski 2021-09-24 6396
3b47d30396bae4 Eric Dumazet 2014-11-06 6397 might_sleep();
3b47d30396bae4 Eric Dumazet 2014-11-06 6398 set_bit(NAPI_STATE_DISABLE, &n->state);
3b47d30396bae4 Eric Dumazet 2014-11-06 6399
719c571970109b Jakub Kicinski 2021-09-24 6400 val = READ_ONCE(n->state);
4ffa1d1c6842a9 Eric Dumazet 2022-11-15 6401 do {
719c571970109b Jakub Kicinski 2021-09-24 6402 if (val & (NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC)) {
719c571970109b Jakub Kicinski 2021-09-24 6403 usleep_range(20, 200);
719c571970109b Jakub Kicinski 2021-09-24 6404 continue;
"new" not initialized for first iteration through the loop.
719c571970109b Jakub Kicinski 2021-09-24 6405 }
719c571970109b Jakub Kicinski 2021-09-24 6406
719c571970109b Jakub Kicinski 2021-09-24 6407 new = val | NAPIF_STATE_SCHED | NAPIF_STATE_NPSVC;
719c571970109b Jakub Kicinski 2021-09-24 6408 new &= ~(NAPIF_STATE_THREADED | NAPIF_STATE_PREFER_BUSY_POLL);
4ffa1d1c6842a9 Eric Dumazet 2022-11-15 @6409 } while (!try_cmpxchg(&n->state, &val, new));
^^^
3b47d30396bae4 Eric Dumazet 2014-11-06 6410
3b47d30396bae4 Eric Dumazet 2014-11-06 6411 hrtimer_cancel(&n->timer);
3b47d30396bae4 Eric Dumazet 2014-11-06 6412
3b47d30396bae4 Eric Dumazet 2014-11-06 6413 clear_bit(NAPI_STATE_DISABLE, &n->state);
3b47d30396bae4 Eric Dumazet 2014-11-06 6414 }
--
0-DAY CI Kernel Test Service
https://01.org/lkp
next reply other threads:[~2022-11-17 7:36 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-17 7:27 kernel test robot [this message]
2022-11-17 7:36 ` [net-next:master 25/27] net/core/dev.c:6409 napi_disable() error: uninitialized symbol 'new' Dan Carpenter
2022-11-17 8:51 ` Eric Dumazet
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