tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/dev head: 32860a6da7c75039afea229ba396aeac3b708d6b commit: 32860a6da7c75039afea229ba396aeac3b708d6b [48/48] EXP rcu: Add trace_printk()s to probe expedited CPU selection config: sparc64-allyesconfig (attached as .config) compiler: sparc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 32860a6da7c75039afea229ba396aeac3b708d6b # save the attached .config to linux build tree make.cross ARCH=sparc64
All warnings (new ones prefixed by >>):
In file included from kernel/rcu/tree.c:31:0:
kernel/rcu/tree_exp.h: In function 'sync_rcu_exp_select_cpus':
kernel/rcu/tree_exp.h:407:16: warning: format '%ld' expects argument of type
'long int', but argument 6 has type 'int' [-Wformat=]
trace_printk("%s rnp %d:%d first pass mask %#lx tasks %ld\n", __func__,
rnp->grplo, rnp->grphi, mask_ofl_ipi, !!rnp->exp_tasks);
^
~~~~~~~~
include/linux/kernel.h:634:33: note: in definition of macro
'__trace_printk_check_format'
____trace_printk_check_format(fmt, ##args); \
^~~
>> include/linux/kernel.h:671:3: note: in expansion of macro 'do_trace_printk'
do_trace_printk(fmt, ##__VA_ARGS__); \
^~~~~~~~~~~~~~~
>> kernel/rcu/tree_exp.h:407:3: note: in expansion of macro 'trace_printk'
trace_printk("%s rnp %d:%d first pass mask %#lx tasks %ld\n", __func__,
rnp->grplo, rnp->grphi, mask_ofl_ipi, !!rnp->exp_tasks);
^~~~~~~~~~~~
kernel/rcu/tree_exp.h:407:16: warning: format '%ld' expects argument of type
'long int', but argument 7 has type 'int' [-Wformat=]
trace_printk("%s rnp %d:%d first pass mask %#lx tasks %ld\n", __func__,
rnp->grplo, rnp->grphi, mask_ofl_ipi, !!rnp->exp_tasks);
^
~~~~~~~~
include/linux/kernel.h:687:29: note: in definition of macro 'do_trace_printk'
__trace_printk(_THIS_IP_, fmt, ##args); \
^~~
>> kernel/rcu/tree_exp.h:407:3: note: in expansion of macro 'trace_printk'
trace_printk("%s rnp %d:%d first pass mask %#lx tasks %ld\n", __func__,
rnp->grplo, rnp->grphi, mask_ofl_ipi, !!rnp->exp_tasks);
^~~~~~~~~~~~
kernel/rcu/tree_exp.h:446:16: warning: format '%ld' expects argument of type
'long int', but argument 6 has type 'int' [-Wformat=]
trace_printk("%s rnp %d:%d second pass mask %#lx tasks %ld\n", __func__,
rnp->grplo, rnp->grphi, mask_ofl_ipi, !!READ_ONCE(rnp->exp_tasks));
^
include/linux/kernel.h:634:33: note: in definition of macro
'__trace_printk_check_format'
____trace_printk_check_format(fmt, ##args); \
^~~
>> include/linux/kernel.h:671:3: note: in expansion of macro 'do_trace_printk'
do_trace_printk(fmt, ##__VA_ARGS__); \
^~~~~~~~~~~~~~~
kernel/rcu/tree_exp.h:446:3: note: in expansion of macro 'trace_printk'
trace_printk("%s rnp %d:%d second pass mask %#lx tasks %ld\n", __func__,
rnp->grplo, rnp->grphi, mask_ofl_ipi, !!READ_ONCE(rnp->exp_tasks));
^~~~~~~~~~~~
kernel/rcu/tree_exp.h:446:16: warning: format '%ld' expects argument of type
'long int', but argument 7 has type 'int' [-Wformat=]
trace_printk("%s rnp %d:%d second pass mask %#lx tasks %ld\n", __func__,
rnp->grplo, rnp->grphi, mask_ofl_ipi, !!READ_ONCE(rnp->exp_tasks));
^
include/linux/kernel.h:687:29: note: in definition of macro 'do_trace_printk'
__trace_printk(_THIS_IP_, fmt, ##args); \
^~~
kernel/rcu/tree_exp.h:446:3: note: in expansion of macro 'trace_printk'
trace_printk("%s rnp %d:%d second pass mask %#lx tasks %ld\n", __func__,
rnp->grplo, rnp->grphi, mask_ofl_ipi, !!READ_ONCE(rnp->exp_tasks));
^~~~~~~~~~~~
vim +/trace_printk +407 kernel/rcu/tree_exp.h
363
364 /*
365 * Select the nodes that the upcoming expedited grace period needs
366 * to wait for.
367 */
368 static void sync_rcu_exp_select_cpus(struct rcu_state *rsp,
369 smp_call_func_t func)
370 {
371 int cpu;
372 unsigned long flags;
373 unsigned long mask_ofl_test;
374 unsigned long mask_ofl_ipi;
375 int ret;
376 struct rcu_node *rnp;
377
378 trace_rcu_exp_grace_period(rsp->name,
rcu_exp_gp_seq_endval(rsp), TPS("reset"));
379 sync_exp_reset_tree(rsp);
380 trace_rcu_exp_grace_period(rsp->name,
rcu_exp_gp_seq_endval(rsp), TPS("select"));
381 rcu_for_each_leaf_node(rsp, rnp) {
382 raw_spin_lock_irqsave_rcu_node(rnp, flags);
383
384 /* Each pass checks a CPU for identity, offline, and
idle. */
385 mask_ofl_test = 0;
386 for_each_leaf_node_possible_cpu(rnp, cpu) {
387 struct rcu_data *rdp = per_cpu_ptr(rsp->rda,
cpu);
388
389 rdp->exp_dynticks_snap =
390 rcu_dynticks_snap(rdp->dynticks);
391 if (raw_smp_processor_id() == cpu ||
392 rcu_dynticks_in_eqs(rdp->exp_dynticks_snap)
||
393 !(rnp->qsmaskinitnext & rdp->grpmask))
394 mask_ofl_test |= rdp->grpmask;
395 trace_printk("%s rnp %d:%d first pass CPU
%d\n", __func__, rnp->grplo, rnp->grphi, cpu);
396 }
397 mask_ofl_ipi = rnp->expmask & ~mask_ofl_test;
398
399 /*
400 * Need to wait for any blocked tasks as well. Note
that
401 * additional blocking tasks will also block the
expedited
402 * GP until such time as the ->expmask bits are cleared.
403 */
404 if (rcu_preempt_has_tasks(rnp))
405 rnp->exp_tasks = rnp->blkd_tasks.next;
406 raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
> 407 trace_printk("%s rnp %d:%d first pass mask %#lx tasks
> %ld\n", __func__, rnp->grplo, rnp->grphi, mask_ofl_ipi, !!rnp->exp_tasks);
408
409 /* IPI the remaining CPUs for expedited quiescent
state. */
410 for_each_leaf_node_possible_cpu(rnp, cpu) {
411 unsigned long mask = leaf_node_cpu_bit(rnp,
cpu);
412 struct rcu_data *rdp = per_cpu_ptr(rsp->rda,
cpu);
413
414 if (!(mask_ofl_ipi & mask))
415 continue;
416 retry_ipi:
417 if (rcu_dynticks_in_eqs_since(rdp->dynticks,
418
rdp->exp_dynticks_snap)) {
419 mask_ofl_test |= mask;
420 continue;
421 }
422 ret = smp_call_function_single(cpu, func, rsp,
0);
423 if (!ret) {
424 mask_ofl_ipi &= ~mask;
425 continue;
426 }
427 /* Failed, raced with CPU hotplug operation. */
428 raw_spin_lock_irqsave_rcu_node(rnp, flags);
429 if ((rnp->qsmaskinitnext & mask) &&
430 (rnp->expmask & mask)) {
431 /* Online, so delay for a bit and try
again. */
432
raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
433 trace_rcu_exp_grace_period(rsp->name,
rcu_exp_gp_seq_endval(rsp), TPS("selectofl"));
434 schedule_timeout_uninterruptible(1);
435 goto retry_ipi;
436 }
437 /* CPU really is offline, so we can ignore it.
*/
438 if (!(rnp->expmask & mask))
439 mask_ofl_ipi &= ~mask;
440 raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
441 }
442 /* Report quiescent states for those that went offline.
*/
443 mask_ofl_test |= mask_ofl_ipi;
444 if (mask_ofl_test)
445 rcu_report_exp_cpu_mult(rsp, rnp,
mask_ofl_test, false);
446 trace_printk("%s rnp %d:%d second pass mask %#lx tasks
%ld\n", __func__, rnp->grplo, rnp->grphi, mask_ofl_ipi,
!!READ_ONCE(rnp->exp_tasks));
447 }
448 }
449
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
.config.gz
Description: application/gzip
