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android_kernel_sony_sdm845/kernel/trace
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Repository files (latest commit first)
Filename Latest commit message Latest commit date
Steven Rostedt (VMware) 03170ea7eb ftrace: Move RCU is watching check after recursion check 
commit b40341fad6cc2daa195f8090fd3348f18fff640a upstream.

The first thing that the ftrace function callback helper functions should do
is to check for recursion. Peter Zijlstra found that when
"rcu_is_watching()" had its notrace removed, it caused perf function tracing
to crash. This is because the call of rcu_is_watching() is tested before
function recursion is checked and and if it is traced, it will cause an
infinite recursion loop.

rcu_is_watching() should still stay notrace, but to prevent this should
never had crashed in the first place. The recursion prevention must be the
first thing done in callback functions.

Link: https://lore.kernel.org/r/20200929112541.GM2628@hirez.programming.kicks-ass.net

Cc: stable@vger.kernel.org
Cc: Paul McKenney <paulmck@kernel.org>
Fixes: c68c0fa293 ("ftrace: Have ftrace_ops_get_func() handle RCU and PER_CPU flags too")
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reported-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-10-14 09:48:15 +02:00
..
blktrace.c blktrace: break out of blktrace setup on concurrent calls 2020-06-30 15:38:43 -04:00
bpf_trace.c bpf: fix check of allowed specifiers in bpf_trace_printk 2018-12-17 09:38:33 +01:00
ftrace.c ftrace: Move RCU is watching check after recursion check 2020-10-14 09:48:15 +02:00
Kconfig Stop the ad-hoc games with -Wno-maybe-initialized 2020-05-20 08:15:37 +02:00
Makefile Disable the __builtin_return_address() warning globally after all 2016-10-12 10:23:41 -07:00
power-traces.c cpufreq: schedutil: New governor based on scheduler utilization data 2016-04-02 01:09:12 +02:00
ring_buffer.c trace: Fix preempt_enable_no_resched() abuse 2019-05-02 09:32:00 +02:00
ring_buffer_benchmark.c ring_buffer: Remove unneeded smp_wmb() before wakeup of reader benchmark 2015-11-03 16:19:02 -05:00
rpm-traces.c
trace.c tracing: Use address-of operator on section symbols 2020-10-01 20:40:10 +02:00
trace.h tracing: Silence GCC 9 array bounds warning 2019-07-10 09:55:28 +02:00
trace_benchmark.c tracing: Only benchmark the time tracepoints take if tracing is on 2015-11-02 13:34:58 -05:00
trace_benchmark.h
trace_branch.c tracing: Remove {start,stop}_branch_trace 2015-10-21 10:10:09 -04:00
trace_clock.c
trace_entries.h tracing: Set kernel_stack's caller size properly 2020-10-01 20:40:05 +02:00
trace_event_perf.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2016-05-17 16:26:30 -07:00
trace_events.c tracing: Adding NULL checks for trace_array descriptor pointer 2020-10-01 20:40:03 +02:00
trace_events_filter.c tracing: Fix regex_match_front() to not over compare the test string 2018-05-16 10:08:43 +02:00
trace_events_filter_test.h
trace_events_hist.c tracing: Use strncpy instead of memcpy for string keys in hist triggers 2019-03-23 13:19:45 +01:00
trace_events_trigger.c tracing: Fix event trigger to accept redundant spaces 2020-06-30 15:38:45 -04:00
trace_export.c tracing: ftrace_event_is_function() can return boolean 2015-11-02 14:28:05 -05:00
trace_functions.c ftrace: Have set_ftrace_pid use the bitmap like events do 2016-06-20 09:54:19 -04:00
trace_functions_graph.c tracing: Fix missing return symbol in function_graph output 2018-07-11 16:26:43 +02:00
trace_hwlat.c tracing/hwlat: Honor the tracing_cpumask 2020-08-26 10:29:03 +02:00
trace_irqsoff.c tracing: Remove redundant reset per-CPU buff in irqsoff tracer 2016-03-18 16:39:11 -04:00
trace_kdb.c tracing: Silence GCC 9 array bounds warning 2019-07-10 09:55:28 +02:00
trace_kprobe.c tracing: Quiet gcc warning about maybe unused link variable 2018-08-03 07:55:12 +02:00
trace_mmiotrace.c tracing: Expose CPU physical addresses (resource values) for PCI devices 2016-06-20 09:54:22 -04:00
trace_nop.c tracing: Fix typoes in code comment and printk in trace_nop.c 2016-03-08 11:23:57 -05:00
trace_output.c tracing: Add NMI tracing in hwlat detector 2016-09-02 12:47:55 -04:00
trace_output.h
trace_printk.c tracing: Handle NULL formats in hold_module_trace_bprintk_format() 2016-06-20 09:46:12 -04:00
trace_probe.c tracing: probeevent: Fix to support minus offset from symbol 2018-03-28 18:39:23 +02:00
trace_probe.h tracing: probeevent: Fix to support minus offset from symbol 2018-03-28 18:39:23 +02:00
trace_sched_switch.c
trace_sched_wakeup.c kernel/trace: Fix do not unregister tracepoints when register sched_migrate_task fail 2020-01-14 20:04:26 +01:00
trace_selftest.c ftrace: Fix selftest goto location on error 2017-09-27 14:39:23 +02:00
trace_selftest_dynamic.c
trace_seq.c
trace_stack.c tracing: Have stack tracer compile when MCOUNT_INSN_SIZE is not defined 2020-01-14 20:04:26 +01:00
trace_stat.c tracing: Fix very unlikely race of registering two stat tracers 2020-02-28 15:42:21 +01:00
trace_stat.h
trace_syscalls.c tracing/syscalls: fix multiline in error message text 2016-09-29 10:25:23 +02:00
trace_uprobe.c tracing/uprobes: Fix output for multiple string arguments 2019-02-20 10:18:32 +01:00
tracing_map.c tracing: Have the histogram compare functions convert to u64 first 2020-01-12 11:24:14 +01:00
tracing_map.h tracing: Update some tracing_map constants and comments 2016-04-19 12:16:06 -04:00