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authorLinus Torvalds <torvalds@linux-foundation.org>2019-03-11 17:01:32 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-03-11 17:01:32 -0700
commit6cdfa54cd22984ae785b0d496b53405d6da9ad1d (patch)
tree6d5d58d21eccdfebf93a5835258d7f333ef21c13 /kernel/events
parenta089e4fed5c5e8717f233d71bb750fbf9e1f38e0 (diff)
parent85f726a35e504418607b77c5e7da165dc1ea63ce (diff)
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Merge tag 'trace-v5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing updates from Steven Rostedt: "The biggest change for this release is in the histogram code: - Add "onchange(var)" histogram handler that executes a action when $var changes. - Add new "snapshot()" action for histogram handlers, that causes a snapshot of the ring buffer when triggered. ie. onchange(var).snapshot() will trigger a snapshot if var changes. - Add alternative for "trace()" action. Currently, to trigger a synthetic event, the name of that event is used as the handler name, which is inconsistent with the other actions. onchange(var).synthetic(param) where it can now be onchange(var).trace(synthetic, param). The older method will still be allowed, as long as the synthetic events do not overlap with other handler names. - The histogram documentation at testcases were updated for the new changes. Outside of the histogram code, we have: - Added a quicker way to enable set_ftrace_filter files, that will make it much quicker to bisect tracing a function that shouldn't be traced and crashes the kernel. (You can echo in numbers to set_ftrace_filter, and it will select the corresponding function that is in available_filter_functions). - Some better displaying of the tracing data (and more information was added). The rest are small fixes and more clean ups to the code" * tag 'trace-v5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (37 commits) tracing: Use strncpy instead of memcpy when copying comm in trace.c tracing: Use strncpy instead of memcpy when copying comm for hist triggers tracing: Use strncpy instead of memcpy for string keys in hist triggers tracing: Use str_has_prefix() in synth_event_create() x86/ftrace: Fix warning and considate ftrace_jmp_replace() and ftrace_call_replace() tracing/perf: Use strndup_user() instead of buggy open-coded version doc: trace: Fix documentation for uprobe_profile tracing: Fix spelling mistake: "analagous" -> "analogous" tracing: Comment why cond_snapshot is checked outside of max_lock protection tracing: Add hist trigger action 'expected fail' test case tracing: Add alternative synthetic event trace action test case tracing: Add hist trigger onchange() handler test case tracing: Add hist trigger snapshot() action test case tracing: Add SPDX license GPL-2.0 license identifier to inter-event testcases tracing: Add alternative synthetic event trace action syntax tracing: Add hist trigger onchange() handler Documentation tracing: Add hist trigger onchange() handler tracing: Add hist trigger snapshot() action Documentation tracing: Add hist trigger snapshot() action tracing: Add conditional snapshot ...
Diffstat (limited to 'kernel/events')
-rw-r--r--kernel/events/uprobes.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index affa830a198c..c5cde87329c7 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -53,7 +53,7 @@ static struct percpu_rw_semaphore dup_mmap_sem;
struct uprobe {
struct rb_node rb_node; /* node in the rb tree */
- atomic_t ref;
+ refcount_t ref;
struct rw_semaphore register_rwsem;
struct rw_semaphore consumer_rwsem;
struct list_head pending_list;
@@ -547,13 +547,13 @@ set_orig_insn(struct arch_uprobe *auprobe, struct mm_struct *mm, unsigned long v
static struct uprobe *get_uprobe(struct uprobe *uprobe)
{
- atomic_inc(&uprobe->ref);
+ refcount_inc(&uprobe->ref);
return uprobe;
}
static void put_uprobe(struct uprobe *uprobe)
{
- if (atomic_dec_and_test(&uprobe->ref)) {
+ if (refcount_dec_and_test(&uprobe->ref)) {
/*
* If application munmap(exec_vma) before uprobe_unregister()
* gets called, we don't get a chance to remove uprobe from
@@ -644,7 +644,7 @@ static struct uprobe *__insert_uprobe(struct uprobe *uprobe)
rb_link_node(&uprobe->rb_node, parent, p);
rb_insert_color(&uprobe->rb_node, &uprobes_tree);
/* get access + creation ref */
- atomic_set(&uprobe->ref, 2);
+ refcount_set(&uprobe->ref, 2);
return u;
}