Merge branch 'next' (accumulated 3.16 merge window patches) into master

Now that 3.15 is released, this merges the 'next' branch into 'master',
bringing us to the normal situation where my 'master' branch is the
merge window.

* accumulated work in next: (6809 commits)
  ufs: sb mutex merge + mutex_destroy
  powerpc: update comments for generic idle conversion
  cris: update comments for generic idle conversion
  idle: remove cpu_idle() forward declarations
  nbd: zero from and len fields in NBD_CMD_DISCONNECT.
  mm: convert some level-less printks to pr_*
  MAINTAINERS: adi-buildroot-devel is moderated
  MAINTAINERS: add linux-api for review of API/ABI changes
  mm/kmemleak-test.c: use pr_fmt for logging
  fs/dlm/debug_fs.c: replace seq_printf by seq_puts
  fs/dlm/lockspace.c: convert simple_str to kstr
  fs/dlm/config.c: convert simple_str to kstr
  mm: mark remap_file_pages() syscall as deprecated
  mm: memcontrol: remove unnecessary memcg argument from soft limit functions
  mm: memcontrol: clean up memcg zoneinfo lookup
  mm/memblock.c: call kmemleak directly from memblock_(alloc|free)
  mm/mempool.c: update the kmemleak stack trace for mempool allocations
  lib/radix-tree.c: update the kmemleak stack trace for radix tree allocations
  mm: introduce kmemleak_update_trace()
  mm/kmemleak.c: use %u to print ->checksum
  ...

1 files changed, 60 insertions, 98 deletions

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 8ce62ef7f6c..e4c85b8f46c 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -30,37 +30,6 @@
 #include <sched.h>
 #include <sys/mman.h>
 
-#ifndef HAVE_ON_EXIT_SUPPORT
-#ifndef ATEXIT_MAX
-#define ATEXIT_MAX 32
-#endif
-static int __on_exit_count = 0;
-typedef void (*on_exit_func_t) (int, void *);
-static on_exit_func_t __on_exit_funcs[ATEXIT_MAX];
-static void *__on_exit_args[ATEXIT_MAX];
-static int __exitcode = 0;
-static void __handle_on_exit_funcs(void);
-static int on_exit(on_exit_func_t function, void *arg);
-#define exit(x) (exit)(__exitcode = (x))
-
-static int on_exit(on_exit_func_t function, void *arg)
-{
-	if (__on_exit_count == ATEXIT_MAX)
-		return -ENOMEM;
-	else if (__on_exit_count == 0)
-		atexit(__handle_on_exit_funcs);
-	__on_exit_funcs[__on_exit_count] = function;
-	__on_exit_args[__on_exit_count++] = arg;
-	return 0;
-}
-
-static void __handle_on_exit_funcs(void)
-{
-	int i;
-	for (i = 0; i < __on_exit_count; i++)
-		__on_exit_funcs[i] (__exitcode, __on_exit_args[i]);
-}
-#endif
 
 struct record {
 	struct perf_tool	tool;
@@ -147,29 +116,19 @@ static void sig_handler(int sig)
 {
 	if (sig == SIGCHLD)
 		child_finished = 1;
+	else
+		signr = sig;
 
 	done = 1;
-	signr = sig;
 }
 
-static void record__sig_exit(int exit_status __maybe_unused, void *arg)
+static void record__sig_exit(void)
 {
-	struct record *rec = arg;
-	int status;
-
-	if (rec->evlist->workload.pid > 0) {
-		if (!child_finished)
-			kill(rec->evlist->workload.pid, SIGTERM);
-
-		wait(&status);
-		if (WIFSIGNALED(status))
-			psignal(WTERMSIG(status), rec->progname);
-	}
-
-	if (signr == -1 || signr == SIGUSR1)
+	if (signr == -1)
 		return;
 
 	signal(signr, SIG_DFL);
+	raise(signr);
 }
 
 static int record__open(struct record *rec)
@@ -243,27 +202,6 @@ static int process_buildids(struct record *rec)
 					      size, &build_id__mark_dso_hit_ops);
 }
 
-static void record__exit(int status, void *arg)
-{
-	struct record *rec = arg;
-	struct perf_data_file *file = &rec->file;
-
-	if (status != 0)
-		return;
-
-	if (!file->is_pipe) {
-		rec->session->header.data_size += rec->bytes_written;
-
-		if (!rec->no_buildid)
-			process_buildids(rec);
-		perf_session__write_header(rec->session, rec->evlist,
-					   file->fd, true);
-		perf_session__delete(rec->session);
-		perf_evlist__delete(rec->evlist);
-		symbol__exit();
-	}
-}
-
 static void perf_event__synthesize_guest_os(struct machine *machine, void *data)
 {
 	int err;
@@ -344,18 +282,19 @@ static volatile int workload_exec_errno;
  * if the fork fails, since we asked by setting its
  * want_signal to true.
  */
-static void workload_exec_failed_signal(int signo, siginfo_t *info,
+static void workload_exec_failed_signal(int signo __maybe_unused,
+					siginfo_t *info,
 					void *ucontext __maybe_unused)
 {
 	workload_exec_errno = info->si_value.sival_int;
 	done = 1;
-	signr = signo;
 	child_finished = 1;
 }
 
 static int __cmd_record(struct record *rec, int argc, const char **argv)
 {
 	int err;
+	int status = 0;
 	unsigned long waking = 0;
 	const bool forks = argc > 0;
 	struct machine *machine;
@@ -367,7 +306,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 
 	rec->progname = argv[0];
 
-	on_exit(record__sig_exit, rec);
+	atexit(record__sig_exit);
 	signal(SIGCHLD, sig_handler);
 	signal(SIGINT, sig_handler);
 	signal(SIGTERM, sig_handler);
@@ -388,32 +327,28 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 						    workload_exec_failed_signal);
 		if (err < 0) {
 			pr_err("Couldn't run the workload!\n");
+			status = err;
 			goto out_delete_session;
 		}
 	}
 
 	if (record__open(rec) != 0) {
 		err = -1;
-		goto out_delete_session;
+		goto out_child;
 	}
 
 	if (!rec->evlist->nr_groups)
 		perf_header__clear_feat(&session->header, HEADER_GROUP_DESC);
 
-	/*
-	 * perf_session__delete(session) will be called at record__exit()
-	 */
-	on_exit(record__exit, rec);
-
 	if (file->is_pipe) {
 		err = perf_header__write_pipe(file->fd);
 		if (err < 0)
-			goto out_delete_session;
+			goto out_child;
 	} else {
 		err = perf_session__write_header(session, rec->evlist,
 						 file->fd, false);
 		if (err < 0)
-			goto out_delete_session;
+			goto out_child;
 	}
 
 	if (!rec->no_buildid
@@ -421,7 +356,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 		pr_err("Couldn't generate buildids. "
 		       "Use --no-buildid to profile anyway.\n");
 		err = -1;
-		goto out_delete_session;
+		goto out_child;
 	}
 
 	machine = &session->machines.host;
@@ -431,7 +366,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 						   process_synthesized_event);
 		if (err < 0) {
 			pr_err("Couldn't synthesize attrs.\n");
-			goto out_delete_session;
+			goto out_child;
 		}
 
 		if (have_tracepoints(&rec->evlist->entries)) {
@@ -447,7 +382,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 								  process_synthesized_event);
 			if (err <= 0) {
 				pr_err("Couldn't record tracing data.\n");
-				goto out_delete_session;
+				goto out_child;
 			}
 			rec->bytes_written += err;
 		}
@@ -475,7 +410,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 	err = __machine__synthesize_threads(machine, tool, &opts->target, rec->evlist->threads,
 					    process_synthesized_event, opts->sample_address);
 	if (err != 0)
-		goto out_delete_session;
+		goto out_child;
 
 	if (rec->realtime_prio) {
 		struct sched_param param;
@@ -484,7 +419,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 		if (sched_setscheduler(0, SCHED_FIFO, &param)) {
 			pr_err("Could not set realtime priority.\n");
 			err = -1;
-			goto out_delete_session;
+			goto out_child;
 		}
 	}
 
@@ -512,13 +447,15 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 
 		if (record__mmap_read_all(rec) < 0) {
 			err = -1;
-			goto out_delete_session;
+			goto out_child;
 		}
 
 		if (hits == rec->samples) {
 			if (done)
 				break;
 			err = poll(rec->evlist->pollfd, rec->evlist->nr_fds, -1);
+			if (err < 0 && errno == EINTR)
+				err = 0;
 			waking++;
 		}
 
@@ -538,28 +475,52 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
 		const char *emsg = strerror_r(workload_exec_errno, msg, sizeof(msg));
 		pr_err("Workload failed: %s\n", emsg);
 		err = -1;
-		goto out_delete_session;
+		goto out_child;
 	}
 
-	if (quiet || signr == SIGUSR1)
-		return 0;
+	if (!quiet) {
+		fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
 
-	fprintf(stderr, "[ perf record: Woken up %ld times to write data ]\n", waking);
+		/*
+		 * Approximate RIP event size: 24 bytes.
+		 */
+		fprintf(stderr,
+			"[ perf record: Captured and wrote %.3f MB %s (~%" PRIu64 " samples) ]\n",
+			(double)rec->bytes_written / 1024.0 / 1024.0,
+			file->path,
+			rec->bytes_written / 24);
+	}
 
-	/*
-	 * Approximate RIP event size: 24 bytes.
-	 */
-	fprintf(stderr,
-		"[ perf record: Captured and wrote %.3f MB %s (~%" PRIu64 " samples) ]\n",
-		(double)rec->bytes_written / 1024.0 / 1024.0,
-		file->path,
-		rec->bytes_written / 24);
+out_child:
+	if (forks) {
+		int exit_status;
 
-	return 0;
+		if (!child_finished)
+			kill(rec->evlist->workload.pid, SIGTERM);
+
+		wait(&exit_status);
+
+		if (err < 0)
+			status = err;
+		else if (WIFEXITED(exit_status))
+			status = WEXITSTATUS(exit_status);
+		else if (WIFSIGNALED(exit_status))
+			signr = WTERMSIG(exit_status);
+	} else
+		status = err;
+
+	if (!err && !file->is_pipe) {
+		rec->session->header.data_size += rec->bytes_written;
+
+		if (!rec->no_buildid)
+			process_buildids(rec);
+		perf_session__write_header(rec->session, rec->evlist,
+					   file->fd, true);
+	}
 
 out_delete_session:
 	perf_session__delete(session);
-	return err;
+	return status;
 }
 
 #define BRANCH_OPT(n, m) \
@@ -988,6 +949,7 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
 
 	err = __cmd_record(&record, argc, argv);
 out_symbol_exit:
+	perf_evlist__delete(rec->evlist);
 	symbol__exit();
 	return err;
 }