Heiko Carstens 5b6045a906 trace: disable preemption before taking raw spinlocks ...

s390 code uses smp_processor_id() in __raw_spin_lock() code which
reveals that a (raw) spinlock is taken without preemption disabled.
This can potentially deadlock.

To fix this explicitly disable and enable preemption.

BUG: using smp_processor_id() in preemptible [00000000] code: cat/2278
caller is trace_find_cmdline+0x40/0xfc
CPU: 0 Not tainted 2.6.30-rc7-dirty #39
Process cat (pid: 2278, task: 000000003faedb68, ksp: 000000003b33b988)
000000003b33b988 000000003b33bae0 0000000000000002 0000000000000000
       000000003b33bb80 000000003b33baf8 000000003b33baf8 00000000000175d6
       0000000000000001 000000003b33b988 000000003f9b0000 000000000000000b
       000000000000000c 000000003b33bb40 000000003b33bae0 0000000000000000
       0000000000000000 00000000000175d6 000000003b33bae0 000000003b33bb28
Call Trace:
([<00000000000174b2>] show_trace+0x112/0x170)
 [<0000000000017582>] show_stack+0x72/0x100
 [<0000000000441538>] dump_stack+0xc8/0xd8
 [<000000000025c350>] debug_smp_processor_id+0x114/0x130
 [<00000000000bf0e4>] trace_find_cmdline+0x40/0xfc
 [<00000000000c35d4>] trace_print_context+0x58/0xac
 [<00000000000bb676>] print_trace_line+0x416/0x470
 [<00000000000bc8fe>] s_show+0x4e/0x428
 [<000000000013834e>] seq_read+0x36a/0x5d4
 [<0000000000112a78>] vfs_read+0xc8/0x174
 [<0000000000112c58>] SyS_read+0x74/0xc4
 [<000000000002c7ae>] sysc_noemu+0x10/0x16
 [<000002000012436c>] 0x2000012436c
1 lock held by cat/2278:
 #0:  (&p->lock){+.+.+.}, at: [<0000000000138056>] seq_read+0x72/0x5d4

[ Impact: fix preempt-unsafe raw spinlock ]

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

2009-05-28 01:21:03 +02:00

..

blktrace.c

blktrace: remove debugfs entries on bad path

2009-05-19 10:29:21 +02:00

ftrace.c

tracing: fix check for return value of register_module_notifier

2009-05-18 10:24:13 +02:00

Kconfig

ftrace: Add task_comm support for trace_event

2009-05-26 03:03:21 +02:00

kmemtrace.c

tracing/filters: use ring_buffer_discard_commit() in filter_check_discard()

2009-04-14 00:00:56 +02:00

Makefile

Merge branch 'tracing/hw-branch-tracing' into tracing/core

2009-05-07 13:36:22 +02:00

ring_buffer_benchmark.c

ring-buffer: check for divide by zero in ring-buffer-benchmark

2009-05-11 13:22:26 -04:00

ring_buffer.c

ring-buffer: move code around to remove some branches

2009-05-11 23:33:06 -04:00

trace_boot.c

tracing: use macros to denote usec and nsec per second

2009-04-07 14:43:06 +02:00

trace_branch.c

Merge branch 'linus' into tracing/core

2009-05-07 11:17:34 +02:00

trace_clock.c

tracing: fix four sparse warnings

2009-03-22 18:16:54 +01:00

trace_event_profile.c

tracing/events: fix concurrent access to ftrace_events list

2009-05-06 10:38:19 +02:00

trace_event_types.h

tracing/filters: distinguish between signed and unsigned fields

2009-04-29 14:06:03 +02:00

trace_events_filter.c

tracing/filters: fix off-by-one bug

2009-05-14 23:55:12 -04:00

trace_events.c

ftrace: clean up of using ftrace_event_enable_disable()

2009-05-26 03:30:31 +02:00

trace_export.c

tracing/filters: distinguish between signed and unsigned fields

2009-04-29 14:06:03 +02:00

trace_functions_graph.c

function-graph: add option to calculate graph time or not

2009-03-24 23:41:11 -04:00

trace_functions.c

…

trace_hw_branches.c

Merge branch 'tracing/hw-branch-tracing' into tracing/core

2009-05-07 13:36:22 +02:00

trace_irqsoff.c

…

trace_mmiotrace.c

tracing: use macros to denote usec and nsec per second

2009-04-07 14:43:06 +02:00

trace_nop.c

tracing/ftrace: make nop-tracer use polling wait for events on pipe

2009-03-23 09:22:15 +01:00

trace_output.c

tracing: add __print_symbolic to trace events

2009-05-26 20:31:50 +02:00

trace_output.h

tracing: add trace_event_read_lock()

2009-05-25 23:53:41 +02:00

trace_power.c

Merge branch 'linus' into tracing/core

2009-05-07 11:17:34 +02:00

trace_printk.c

tracing/ftrace: factorize the tracing files creation

2009-04-07 14:43:07 +02:00

trace_sched_switch.c

tracing/events: move trace point headers into include/trace/events

2009-04-14 22:05:43 -04:00

trace_sched_wakeup.c

tracing/wakeup: move access to wakeup_cpu into spinlock

2009-04-23 23:01:36 -04:00

trace_selftest_dynamic.c

…

trace_selftest.c

x86, hw-branch-tracer: allocate selftest iterator on heap

2009-04-07 13:36:21 +02:00

trace_stack.c

tracing/ftrace: factorize the tracing files creation

2009-04-07 14:43:07 +02:00

trace_stat.c

Merge branch 'linus' into tracing/core

2009-04-07 13:47:45 +02:00

trace_stat.h

tracing: add handler to trace_stat

2009-03-24 23:22:58 -04:00

trace_syscalls.c

tracing/syscalls: use a dedicated file header

2009-04-09 05:43:32 +02:00

trace_sysprof.c

tracing/ftrace: factorize the tracing files creation

2009-04-07 14:43:07 +02:00

trace_workqueue.c

Merge branch 'linus' into tracing/core

2009-04-07 13:47:45 +02:00

trace.c

trace: disable preemption before taking raw spinlocks

2009-05-28 01:21:03 +02:00

trace.h

Merge branch 'tracing/hw-branch-tracing' into tracing/core

2009-05-07 13:36:22 +02:00