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linux/include/trace/events
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Steven Rostedt (VMware) be5be29dce tracing/x86/xen: Remove zero data size trace events trace_xen_mmu_flush_tlb{_all} 
commit 45dd9b0666 upstream.

Doing an audit of trace events, I discovered two trace events in the xen
subsystem that use a hack to create zero data size trace events. This is not
what trace events are for. Trace events add memory footprint overhead, and
if all you need to do is see if a function is hit or not, simply make that
function noinline and use function tracer filtering.

Worse yet, the hack used was:

 __array(char, x, 0)

Which creates a static string of zero in length. There's assumptions about
such constructs in ftrace that this is a dynamic string that is nul
terminated. This is not the case with these tracepoints and can cause
problems in various parts of ftrace.

Nuke the trace events!

Link: http://lkml.kernel.org/r/20180509144605.5a220327@gandalf.local.home

Fixes: 95a7d76897 ("xen/mmu: Use Xen specific TLB flush instead of the generic one.")
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
[bwh: Backported to 3.16: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
History 2018-10-21 08:46:06 +01:00
..
9p.h 9p: trace: use %*ph to dump buffer 2013-05-28 13:42:08 -05:00
asoc.h ASoC: Remove ASoC level IO tracing 2014-04-22 13:24:24 +01:00
bcache.h bcache: Kill unused freelist 2014-03-18 12:23:36 -07:00
block.h blktrace: fix accounting of partially completed requests 2014-03-05 16:11:21 -07:00
btrfs.h btrfs: Add trace for btrfs_workqueue alloc/destroy 2014-03-20 17:15:28 -07:00
compaction.h mm/compaction: do not count migratepages when unnecessary 2014-06-04 16:54:07 -07:00
context_tracking.h context_tracking: User/kernel broundary cross trace events 2013-08-14 17:14:48 +02:00
ext3.h jbd: change journal_invalidatepage() to accept length 2013-05-21 23:26:36 -04:00
ext4.h ext4: rename uninitialized extents to unwritten 2014-04-20 23:45:47 -04:00
f2fs.h f2fs: add a tracepoint for f2fs_read_data_page 2014-05-07 10:21:59 +09:00
filelock.h locks: add some tracepoints in the lease handling code 2014-06-02 08:09:30 -04:00
filemap.h mm: trace filemap add and del 2013-04-29 15:54:28 -07:00
gfpflags.h mm: get rid of __GFP_KMEMCG 2014-06-04 16:53:56 -07:00
gpio.h gpio: add trace events for setting direction and value 2011-05-20 00:40:19 -06:00
host1x.h gpu: host1x: Add channel support 2013-04-22 12:32:43 +02:00
hswadsp.h Merge remote-tracking branches 'asoc/topic/ml26124', 'asoc/topic/of', 'asoc/topic/omap', 'asoc/topic/pxa' and 'asoc/topic/rcar' into asoc-next 2014-03-12 23:04:35 +00:00
i2c.h i2c: Add message transfer tracepoints for SMBUS [ver #2] 2014-03-13 22:15:07 +01:00
intel-sst.h Merge remote-tracking branches 'asoc/topic/ml26124', 'asoc/topic/of', 'asoc/topic/omap', 'asoc/topic/pxa' and 'asoc/topic/rcar' into asoc-next 2014-03-12 23:04:35 +00:00
iommu.h iommu: Add iommu_error class event to iommu trace 2013-09-25 11:07:04 +02:00
irq.h rcu: Use softirq to address performance regression 2011-06-14 15:25:39 -07:00
jbd.h jbd: Write journal superblock with WRITE_FUA after checkpointing 2012-05-15 23:34:37 +02:00
jbd2.h jbd2: trace when lock_buffer in do_get_write_access takes a long time 2013-04-21 16:47:54 -04:00
kmem.h mm: when stealing freepages, also take pages created by splitting buddy page 2015-03-02 13:17:16 +00:00
kvm.h KVM: Fix stack-out-of-bounds read in write_mmio 2018-01-01 20:52:11 +00:00
lock.h tracing: Factorize lock events in a lock class 2010-05-09 13:45:35 +02:00
mce.h tracing: Fix event alignment: mce:mce_record 2011-03-10 10:34:28 -05:00
migrate.h tracing: Fix event header migrate.h to include tracepoint.h 2014-03-07 10:06:09 -05:00
module.h This contains two fixes. 2014-05-08 14:17:13 -07:00
napi.h napi: Convert trace_napi_poll to TRACE_EVENT 2010-09-07 17:51:01 +02:00
net.h net: Rename skb->rxhash to skb->hash 2014-03-26 15:58:20 -04:00
nmi.h x86: Add NMI duration tracepoints 2013-06-23 11:52:58 +02:00
oom.h mm, oom: change type of oom_score_adj to short 2012-12-11 17:22:27 -08:00
pagemap.h mm: add tracepoints for LRU activation and insertions 2013-07-03 16:07:31 -07:00
power.h PM / sleep: trace events for device PM callbacks 2014-06-11 02:16:48 +02:00
power_cpu_migrate.h ARM: bL_switcher/trace: Add trace trigger for trace bootstrapping 2013-09-23 18:47:30 -04:00
printk.h printk/tracing: rework console tracing 2013-04-29 18:28:13 -07:00
random.h random: convert DEBUG_ENT to tracepoints 2013-10-10 14:32:23 -04:00
ras.h PCI, AER: Fix severity usage in aer trace event 2013-12-08 15:39:10 +01:00
rcu.h rcu: Avoid sparse warnings in rcu_nocb_wake trace event 2013-09-23 09:18:17 -07:00
regmap.h regmap: introduce regmap_name to fix syscon regmap trace events 2015-04-10 10:03:57 +01:00
regulator.h regulator: Add basic trace facilities 2011-01-12 14:33:00 +00:00
rpm.h device.h: audit and cleanup users in main include dir 2012-03-16 10:38:24 -04:00
sched.h tracing/sched: Check preempt_count() for current when reading task->state 2015-01-15 10:44:06 +00:00
scsi.h [SCSI] Include protection operation in SCSI command trace 2011-03-14 18:36:02 -05:00
signal.h tracing: let trace_signal_generate() report more info, kill overflow_fail/lose_info 2012-01-13 18:48:50 +01:00
skb.h tracing: Fix event alignment: skb:kfree_skb 2011-03-10 10:34:31 -05:00
sock.h core: add tracepoints for queueing skb to rcvbuf 2011-06-21 16:06:10 -07:00
spi.h spi: Provide common spi_message processing loop 2013-10-11 20:09:50 +01:00
sunrpc.h SUNRPC: Fix oops when trace sunrpc_task events in nfs client 2014-03-07 19:10:08 -05:00
swiotlb.h tracing/events: Add bounce tracing to swiotbl 2013-10-02 12:53:26 -04:00
syscalls.h tracing: Add #undef to fix compile error 2017-07-18 18:40:06 +01:00
target.h target: Fix assignment of LUN in tracepoints 2013-10-09 01:54:44 -07:00
task.h exec: kill bprm->tcomm[], simplify the "basename" logic 2014-04-07 16:36:05 -07:00
timer.h Merge branch 'timers-nohz-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-05-05 13:23:27 -07:00
udp.h udp: add tracepoints for queueing skb to rcvbuf 2011-06-21 16:06:10 -07:00
v4l2.h [media] v4l: add stream format for SDR receiver 2014-03-05 14:15:12 -03:00
vmscan.h mm: shrinker: add nid to tracepoint output 2014-06-04 16:54:04 -07:00
workqueue.h workqueue: rename cpu_workqueue to pool_workqueue 2013-02-13 19:29:12 -08:00
writeback.h Most of the changes were largely clean ups, and some documentation. 2014-04-03 10:26:31 -07:00
xen.h tracing/x86/xen: Remove zero data size trace events trace_xen_mmu_flush_tlb{_all} 2018-10-21 08:46:06 +01:00