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Merge tag 'trace-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

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Pull tracing updates from Steven Rostedt:
 "The main changes in this release include:

   - Add user space specific memory reading for kprobes

   - Allow kprobes to be executed earlier in boot

  The rest are mostly just various clean ups and small fixes"

* tag 'trace-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (33 commits)
  tracing: Make trace_get_fields() global
  tracing: Let filter_assign_type() detect FILTER_PTR_STRING
  tracing: Pass type into tracing_generic_entry_update()
  ftrace/selftest: Test if set_event/ftrace_pid exists before writing
  ftrace/selftests: Return the skip code when tracing directory not configured in kernel
  tracing/kprobe: Check registered state using kprobe
  tracing/probe: Add trace_event_call accesses APIs
  tracing/probe: Add probe event name and group name accesses APIs
  tracing/probe: Add trace flag access APIs for trace_probe
  tracing/probe: Add trace_event_file access APIs for trace_probe
  tracing/probe: Add trace_event_call register API for trace_probe
  tracing/probe: Add trace_probe init and free functions
  tracing/uprobe: Set print format when parsing command
  tracing/kprobe: Set print format right after parsed command
  kprobes: Fix to init kprobes in subsys_initcall
  tracepoint: Use struct_size() in kmalloc()
  ring-buffer: Remove HAVE_64BIT_ALIGNED_ACCESS
  ftrace: Enable trampoline when rec count returns back to one
  tracing/kprobe: Do not run kprobe boot tests if kprobe_event is on cmdline
  tracing: Make a separate config for trace event self tests
  ...
This commit is contained in:
Linus Torvalds
2019-07-18 11:51:00 -07:00
parent d4df33b0e9 0aeb1def44
commit 818e95c768
33 changed files with 864 additions and 414 deletions
Download Patch File Download Diff File Expand all files Collapse all files

48
kernel/trace/ftrace.c
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@@ -1622,6 +1622,11 @@ static bool test_rec_ops_needs_regs(struct dyn_ftrace *rec)
return keep_regs;
}
static struct ftrace_ops *
ftrace_find_tramp_ops_any(struct dyn_ftrace *rec);
static struct ftrace_ops *
ftrace_find_tramp_ops_next(struct dyn_ftrace *rec, struct ftrace_ops *ops);
static bool __ftrace_hash_rec_update(struct ftrace_ops *ops,
int filter_hash,
bool inc)
@@ -1750,15 +1755,17 @@ static bool __ftrace_hash_rec_update(struct ftrace_ops *ops,
}
/*
* If the rec had TRAMP enabled, then it needs to
* be cleared. As TRAMP can only be enabled iff
* there is only a single ops attached to it.
* In otherwords, always disable it on decrementing.
* In the future, we may set it if rec count is
* decremented to one, and the ops that is left
* has a trampoline.
* The TRAMP needs to be set only if rec count
* is decremented to one, and the ops that is
* left has a trampoline. As TRAMP can only be
* enabled if there is only a single ops attached
* to it.
*/
rec->flags &= ~FTRACE_FL_TRAMP;
if (ftrace_rec_count(rec) == 1 &&
ftrace_find_tramp_ops_any(rec))
rec->flags |= FTRACE_FL_TRAMP;
else
rec->flags &= ~FTRACE_FL_TRAMP;
/*
* flags will be cleared in ftrace_check_record()
@@ -1768,7 +1775,7 @@ static bool __ftrace_hash_rec_update(struct ftrace_ops *ops,
count++;
/* Must match FTRACE_UPDATE_CALLS in ftrace_modify_all_code() */
update |= ftrace_test_record(rec, 1) != FTRACE_UPDATE_IGNORE;
update |= ftrace_test_record(rec, true) != FTRACE_UPDATE_IGNORE;
/* Shortcut, if we handled all records, we are done. */
if (!all && count == hash->count)
@@ -1951,11 +1958,6 @@ static void print_ip_ins(const char *fmt, const unsigned char *p)
printk(KERN_CONT "%s%02x", i ? ":" : "", p[i]);
}
static struct ftrace_ops *
ftrace_find_tramp_ops_any(struct dyn_ftrace *rec);
static struct ftrace_ops *
ftrace_find_tramp_ops_next(struct dyn_ftrace *rec, struct ftrace_ops *ops);
enum ftrace_bug_type ftrace_bug_type;
const void *ftrace_expected;
@@ -2047,7 +2049,7 @@ void ftrace_bug(int failed, struct dyn_ftrace *rec)
}
}
static int ftrace_check_record(struct dyn_ftrace *rec, int enable, int update)
static int ftrace_check_record(struct dyn_ftrace *rec, bool enable, bool update)
{
unsigned long flag = 0UL;
@@ -2146,28 +2148,28 @@ static int ftrace_check_record(struct dyn_ftrace *rec, int enable, int update)
/**
* ftrace_update_record, set a record that now is tracing or not
* @rec: the record to update
* @enable: set to 1 if the record is tracing, zero to force disable
* @enable: set to true if the record is tracing, false to force disable
*
* The records that represent all functions that can be traced need
* to be updated when tracing has been enabled.
*/
int ftrace_update_record(struct dyn_ftrace *rec, int enable)
int ftrace_update_record(struct dyn_ftrace *rec, bool enable)
{
return ftrace_check_record(rec, enable, 1);
return ftrace_check_record(rec, enable, true);
}
/**
* ftrace_test_record, check if the record has been enabled or not
* @rec: the record to test
* @enable: set to 1 to check if enabled, 0 if it is disabled
* @enable: set to true to check if enabled, false if it is disabled
*
* The arch code may need to test if a record is already set to
* tracing to determine how to modify the function code that it
* represents.
*/
int ftrace_test_record(struct dyn_ftrace *rec, int enable)
int ftrace_test_record(struct dyn_ftrace *rec, bool enable)
{
return ftrace_check_record(rec, enable, 0);
return ftrace_check_record(rec, enable, false);
}
static struct ftrace_ops *
@@ -2356,7 +2358,7 @@ unsigned long ftrace_get_addr_curr(struct dyn_ftrace *rec)
}
static int
__ftrace_replace_code(struct dyn_ftrace *rec, int enable)
__ftrace_replace_code(struct dyn_ftrace *rec, bool enable)
{
unsigned long ftrace_old_addr;
unsigned long ftrace_addr;
@@ -2395,7 +2397,7 @@ void __weak ftrace_replace_code(int mod_flags)
{
struct dyn_ftrace *rec;
struct ftrace_page *pg;
int enable = mod_flags & FTRACE_MODIFY_ENABLE_FL;
bool enable = mod_flags & FTRACE_MODIFY_ENABLE_FL;
int schedulable = mod_flags & FTRACE_MODIFY_MAY_SLEEP_FL;
int failed;