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linux-next/kernel/trace/trace_branch.c
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02 11:10:55 +01:00

452 lines
10 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* unlikely profiler
*
* Copyright (C) 2008 Steven Rostedt <srostedt@redhat.com>
*/
#include <linux/kallsyms.h>
#include <linux/seq_file.h>
#include <linux/spinlock.h>
#include <linux/irqflags.h>
#include <linux/uaccess.h>
#include <linux/module.h>
#include <linux/ftrace.h>
#include <linux/hash.h>
#include <linux/fs.h>
#include <asm/local.h>
#include "trace.h"
#include "trace_stat.h"
#include "trace_output.h"
#ifdef CONFIG_BRANCH_TRACER
static struct tracer branch_trace;
static int branch_tracing_enabled __read_mostly;
static DEFINE_MUTEX(branch_tracing_mutex);
static struct trace_array *branch_tracer;
static void
probe_likely_condition(struct ftrace_likely_data *f, int val, int expect)
{
struct trace_event_call *call = &event_branch;
struct trace_array *tr = branch_tracer;
struct trace_array_cpu *data;
struct ring_buffer_event *event;
struct trace_branch *entry;
struct ring_buffer *buffer;
unsigned long flags;
int pc;
const char *p;
if (current->trace_recursion & TRACE_BRANCH_BIT)
return;
/*
* I would love to save just the ftrace_likely_data pointer, but
* this code can also be used by modules. Ugly things can happen
* if the module is unloaded, and then we go and read the
* pointer. This is slower, but much safer.
*/
if (unlikely(!tr))
return;
raw_local_irq_save(flags);
current->trace_recursion |= TRACE_BRANCH_BIT;
data = this_cpu_ptr(tr->trace_buffer.data);
if (atomic_read(&data->disabled))
goto out;
pc = preempt_count();
buffer = tr->trace_buffer.buffer;
event = trace_buffer_lock_reserve(buffer, TRACE_BRANCH,
sizeof(*entry), flags, pc);
if (!event)
goto out;
entry = ring_buffer_event_data(event);
/* Strip off the path, only save the file */
p = f->data.file + strlen(f->data.file);
while (p >= f->data.file && *p != '/')
p--;
p++;
strncpy(entry->func, f->data.func, TRACE_FUNC_SIZE);
strncpy(entry->file, p, TRACE_FILE_SIZE);
entry->func[TRACE_FUNC_SIZE] = 0;
entry->file[TRACE_FILE_SIZE] = 0;
entry->constant = f->constant;
entry->line = f->data.line;
entry->correct = val == expect;
if (!call_filter_check_discard(call, entry, buffer, event))
trace_buffer_unlock_commit_nostack(buffer, event);
out:
current->trace_recursion &= ~TRACE_BRANCH_BIT;
raw_local_irq_restore(flags);
}
static inline
void trace_likely_condition(struct ftrace_likely_data *f, int val, int expect)
{
if (!branch_tracing_enabled)
return;
probe_likely_condition(f, val, expect);
}
int enable_branch_tracing(struct trace_array *tr)
{
mutex_lock(&branch_tracing_mutex);
branch_tracer = tr;
/*
* Must be seen before enabling. The reader is a condition
* where we do not need a matching rmb()
*/
smp_wmb();
branch_tracing_enabled++;
mutex_unlock(&branch_tracing_mutex);
return 0;
}
void disable_branch_tracing(void)
{
mutex_lock(&branch_tracing_mutex);
if (!branch_tracing_enabled)
goto out_unlock;
branch_tracing_enabled--;
out_unlock:
mutex_unlock(&branch_tracing_mutex);
}
static int branch_trace_init(struct trace_array *tr)
{
return enable_branch_tracing(tr);
}
static void branch_trace_reset(struct trace_array *tr)
{
disable_branch_tracing();
}
static enum print_line_t trace_branch_print(struct trace_iterator *iter,
int flags, struct trace_event *event)
{
struct trace_branch *field;
trace_assign_type(field, iter->ent);
trace_seq_printf(&iter->seq, "[%s] %s:%s:%d\n",
field->correct ? " ok " : " MISS ",
field->func,
field->file,
field->line);
return trace_handle_return(&iter->seq);
}
static void branch_print_header(struct seq_file *s)
{
seq_puts(s, "# TASK-PID CPU# TIMESTAMP CORRECT"
" FUNC:FILE:LINE\n"
"# | | | | | "
" |\n");
}
static struct trace_event_functions trace_branch_funcs = {
.trace = trace_branch_print,
};
static struct trace_event trace_branch_event = {
.type = TRACE_BRANCH,
.funcs = &trace_branch_funcs,
};
static struct tracer branch_trace __read_mostly =
{
.name = "branch",
.init = branch_trace_init,
.reset = branch_trace_reset,
#ifdef CONFIG_FTRACE_SELFTEST
.selftest = trace_selftest_startup_branch,
#endif /* CONFIG_FTRACE_SELFTEST */
.print_header = branch_print_header,
};
__init static int init_branch_tracer(void)
{
int ret;
ret = register_trace_event(&trace_branch_event);
if (!ret) {
printk(KERN_WARNING "Warning: could not register "
"branch events\n");
return 1;
}
return register_tracer(&branch_trace);
}
core_initcall(init_branch_tracer);
#else
static inline
void trace_likely_condition(struct ftrace_likely_data *f, int val, int expect)
{
}
#endif /* CONFIG_BRANCH_TRACER */
void ftrace_likely_update(struct ftrace_likely_data *f, int val,
int expect, int is_constant)
{
/* A constant is always correct */
if (is_constant) {
f->constant++;
val = expect;
}
/*
* I would love to have a trace point here instead, but the
* trace point code is so inundated with unlikely and likely
* conditions that the recursive nightmare that exists is too
* much to try to get working. At least for now.
*/
trace_likely_condition(f, val, expect);
/* FIXME: Make this atomic! */
if (val == expect)
f->data.correct++;
else
f->data.incorrect++;
}
EXPORT_SYMBOL(ftrace_likely_update);
extern unsigned long __start_annotated_branch_profile[];
extern unsigned long __stop_annotated_branch_profile[];
static int annotated_branch_stat_headers(struct seq_file *m)
{
seq_puts(m, " correct incorrect % "
" Function "
" File Line\n"
" ------- --------- - "
" -------- "
" ---- ----\n");
return 0;
}
static inline long get_incorrect_percent(struct ftrace_branch_data *p)
{
long percent;
if (p->correct) {
percent = p->incorrect * 100;
percent /= p->correct + p->incorrect;
} else
percent = p->incorrect ? 100 : -1;
return percent;
}
static const char *branch_stat_process_file(struct ftrace_branch_data *p)
{
const char *f;
/* Only print the file, not the path */
f = p->file + strlen(p->file);
while (f >= p->file && *f != '/')
f--;
return ++f;
}
static void branch_stat_show(struct seq_file *m,
struct ftrace_branch_data *p, const char *f)
{
long percent;
/*
* The miss is overlayed on correct, and hit on incorrect.
*/
percent = get_incorrect_percent(p);
if (percent < 0)
seq_puts(m, " X ");
else
seq_printf(m, "%3ld ", percent);
seq_printf(m, "%-30.30s %-20.20s %d\n", p->func, f, p->line);
}
static int branch_stat_show_normal(struct seq_file *m,
struct ftrace_branch_data *p, const char *f)
{
seq_printf(m, "%8lu %8lu ", p->correct, p->incorrect);
branch_stat_show(m, p, f);
return 0;
}
static int annotate_branch_stat_show(struct seq_file *m, void *v)
{
struct ftrace_likely_data *p = v;
const char *f;
int l;
f = branch_stat_process_file(&p->data);
if (!p->constant)
return branch_stat_show_normal(m, &p->data, f);
l = snprintf(NULL, 0, "/%lu", p->constant);
l = l > 8 ? 0 : 8 - l;
seq_printf(m, "%8lu/%lu %*lu ",
p->data.correct, p->constant, l, p->data.incorrect);
branch_stat_show(m, &p->data, f);
return 0;
}
static void *annotated_branch_stat_start(struct tracer_stat *trace)
{
return __start_annotated_branch_profile;
}
static void *
annotated_branch_stat_next(void *v, int idx)
{
struct ftrace_likely_data *p = v;
++p;
if ((void *)p >= (void *)__stop_annotated_branch_profile)
return NULL;
return p;
}
static int annotated_branch_stat_cmp(void *p1, void *p2)
{
struct ftrace_branch_data *a = p1;
struct ftrace_branch_data *b = p2;
long percent_a, percent_b;
percent_a = get_incorrect_percent(a);
percent_b = get_incorrect_percent(b);
if (percent_a < percent_b)
return -1;
if (percent_a > percent_b)
return 1;
if (a->incorrect < b->incorrect)
return -1;
if (a->incorrect > b->incorrect)
return 1;
/*
* Since the above shows worse (incorrect) cases
* first, we continue that by showing best (correct)
* cases last.
*/
if (a->correct > b->correct)
return -1;
if (a->correct < b->correct)
return 1;
return 0;
}
static struct tracer_stat annotated_branch_stats = {
.name = "branch_annotated",
.stat_start = annotated_branch_stat_start,
.stat_next = annotated_branch_stat_next,
.stat_cmp = annotated_branch_stat_cmp,
.stat_headers = annotated_branch_stat_headers,
.stat_show = annotate_branch_stat_show
};
__init static int init_annotated_branch_stats(void)
{
int ret;
ret = register_stat_tracer(&annotated_branch_stats);
if (!ret) {
printk(KERN_WARNING "Warning: could not register "
"annotated branches stats\n");
return 1;
}
return 0;
}
fs_initcall(init_annotated_branch_stats);
#ifdef CONFIG_PROFILE_ALL_BRANCHES
extern unsigned long __start_branch_profile[];
extern unsigned long __stop_branch_profile[];
static int all_branch_stat_headers(struct seq_file *m)
{
seq_puts(m, " miss hit % "
" Function "
" File Line\n"
" ------- --------- - "
" -------- "
" ---- ----\n");
return 0;
}
static void *all_branch_stat_start(struct tracer_stat *trace)
{
return __start_branch_profile;
}
static void *
all_branch_stat_next(void *v, int idx)
{
struct ftrace_branch_data *p = v;
++p;
if ((void *)p >= (void *)__stop_branch_profile)
return NULL;
return p;
}
static int all_branch_stat_show(struct seq_file *m, void *v)
{
struct ftrace_branch_data *p = v;
const char *f;
f = branch_stat_process_file(p);
return branch_stat_show_normal(m, p, f);
}
static struct tracer_stat all_branch_stats = {
.name = "branch_all",
.stat_start = all_branch_stat_start,
.stat_next = all_branch_stat_next,
.stat_headers = all_branch_stat_headers,
.stat_show = all_branch_stat_show
};
__init static int all_annotated_branch_stats(void)
{
int ret;
ret = register_stat_tracer(&all_branch_stats);
if (!ret) {
printk(KERN_WARNING "Warning: could not register "
"all branches stats\n");
return 1;
}
return 0;
}
fs_initcall(all_annotated_branch_stats);
#endif /* CONFIG_PROFILE_ALL_BRANCHES */