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authorLinus Torvalds <torvalds@linux-foundation.org>2020-08-07 18:29:15 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-08-07 18:29:15 -0700
commit32663c78c10f80df90b832de0428a6cb98a64e9a (patch)
treef7b4518ee7c8d84d91320461763181fc35698e24 /kernel/kprobes.c
parent7b9de97711225559af213dc52b6ea883ef1ea7a8 (diff)
parent38ce2a9e33db61a3041840310077072d6210ead4 (diff)
Merge tag 'trace-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing updates from Steven Rostedt: - The biggest news in that the tracing ring buffer can now time events that interrupted other ring buffer events. Before this change, if an interrupt came in while recording another event, and that interrupt also had an event, those events would all have the same time stamp as the event it interrupted. Now, with the new design, those events will have a unique time stamp and rightfully display the time for those events that were recorded while interrupting another event. - Bootconfig how has an "override" operator that lets the users have a default config, but then add options to override the default. - A fix was made to properly filter function graph tracing to the ftrace PIDs. This came in at the end of the -rc cycle, and needs to be backported. - Several clean ups, performance updates, and minor fixes as well. * tag 'trace-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (39 commits) tracing: Add trace_array_init_printk() to initialize instance trace_printk() buffers kprobes: Fix compiler warning for !CONFIG_KPROBES_ON_FTRACE tracing: Use trace_sched_process_free() instead of exit() for pid tracing bootconfig: Fix to find the initargs correctly Documentation: bootconfig: Add bootconfig override operator tools/bootconfig: Add testcases for value override operator lib/bootconfig: Add override operator support kprobes: Remove show_registers() function prototype tracing/uprobe: Remove dead code in trace_uprobe_register() kprobes: Fix NULL pointer dereference at kprobe_ftrace_handler ftrace: Fix ftrace_trace_task return value tracepoint: Use __used attribute definitions from compiler_attributes.h tracepoint: Mark __tracepoint_string's __used trace : Have tracing buffer info use kvzalloc instead of kzalloc tracing: Remove outdated comment in stack handling ftrace: Do not let direct or IPMODIFY ftrace_ops be added to module and set trampolines ftrace: Setup correct FTRACE_FL_REGS flags for module tracing/hwlat: Honor the tracing_cpumask tracing/hwlat: Drop the duplicate assignment in start_kthread() tracing: Save one trace_event->type by using __TRACE_LAST_TYPE ...
Diffstat (limited to 'kernel/kprobes.c')
-rw-r--r--kernel/kprobes.c24
1 files changed, 21 insertions, 3 deletions
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index e87679a48ba2..287b263c9cb9 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1111,9 +1111,20 @@ static int disarm_kprobe_ftrace(struct kprobe *p)
ipmodify ? &kprobe_ipmodify_enabled : &kprobe_ftrace_enabled);
}
#else /* !CONFIG_KPROBES_ON_FTRACE */
-#define prepare_kprobe(p) arch_prepare_kprobe(p)
-#define arm_kprobe_ftrace(p) (-ENODEV)
-#define disarm_kprobe_ftrace(p) (-ENODEV)
+static inline int prepare_kprobe(struct kprobe *p)
+{
+ return arch_prepare_kprobe(p);
+}
+
+static inline int arm_kprobe_ftrace(struct kprobe *p)
+{
+ return -ENODEV;
+}
+
+static inline int disarm_kprobe_ftrace(struct kprobe *p)
+{
+ return -ENODEV;
+}
#endif
/* Arm a kprobe with text_mutex */
@@ -2145,6 +2156,13 @@ static void kill_kprobe(struct kprobe *p)
* the original probed function (which will be freed soon) any more.
*/
arch_remove_kprobe(p);
+
+ /*
+ * The module is going away. We should disarm the kprobe which
+ * is using ftrace.
+ */
+ if (kprobe_ftrace(p))
+ disarm_kprobe_ftrace(p);
}
/* Disable one kprobe */