[rcu:rcu/dev 48/48] kernel/rcu/tree_exp.h:407:3: warning: format '%ld' expects argument of type 'long int', but argument 6 has type 'int'

From: kbuild test robot
Date: Thu Feb 01 2018 - 01:54:57 EST

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: i386-randconfig-a0-201804 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
git checkout 32860a6da7c75039afea229ba396aeac3b708d6b
# save the attached .config to linux build tree
make ARCH=i386

All warnings (new ones prefixed by >>):

In file included from kernel/rcu/tree.c:4199:0:
kernel/rcu/tree_exp.h: In function 'sync_rcu_exp_select_cpus':
>> kernel/rcu/tree_exp.h:407:3: 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);
^
kernel/rcu/tree_exp.h:407:3: warning: format '%ld' expects argument of type 'long int', but argument 7 has type 'int' [-Wformat=]
In file included from include/linux/kernel.h:10:0,
from kernel/rcu/tree.c:31:
include/linux/compiler.h:246:8: warning: format '%ld' expects argument of type 'long int', but argument 6 has type 'int' [-Wformat=]
union { typeof(x) __val; char __c[1]; } __u; \
^
include/linux/compiler.h:254:22: note: in expansion of macro '__READ_ONCE'
#define READ_ONCE(x) __READ_ONCE(x, 1)
^
include/linux/kernel.h:634:40: note: in expansion of macro 'READ_ONCE'
____trace_printk_check_format(fmt, ##args); \
^
include/linux/kernel.h:682:2: note: in expansion 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));
^
include/linux/compiler.h:246:8: warning: format '%ld' expects argument of type 'long int', but argument 7 has type 'int' [-Wformat=]
union { typeof(x) __val; char __c[1]; } __u; \
^
include/linux/compiler.h:254:22: note: in expansion of macro '__READ_ONCE'
#define READ_ONCE(x) __READ_ONCE(x, 1)
^
include/linux/kernel.h:687:36: note: in expansion of macro 'READ_ONCE'
__trace_printk(_THIS_IP_, 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));
^

vim +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

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