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/*
 * Copyright 2015, Michael Neuling, IBM Corp.
 * Licensed under GPLv2.
 *
 * Edited: Rashmica Gupta, Nov 2015
 *
 * This test does a fork syscall inside a transaction. Basic sniff test
 * to see if we can enter the kernel during a transaction.
 */

#include <errno.h>
#include <inttypes.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "utils.h"
#include "tm.h"

int test_fork(void)
{
	SKIP_IF(!have_htm());

	asm __volatile__(
		"tbegin.;"
		"blt    1f; "
		"li     0, 2;"  /* fork syscall */
		"sc  ;"
		"tend.;"
		"1: ;"
		: : : "memory", "r0");
	/* If we reach here, we've passed.  Otherwise we've probably crashed
	 * the kernel */

	return 0;
}

int main(int argc, char *argv[])
{
	return test_harness(test_fork, "tm_fork");
}
unreliable, but that left RAPL in broken state. This was not noticed because on a regular boot all CPUs are online before RAPL is initialized. A possible fix would be to reintroduce the mess which allocates a package data structure in CPU prepare and when it turns out to already exist in starting throw it away later in the CPU online callback. But that's a horrible hack and not required at all because RAPL becomes functional for perf only in the CPU online callback. That's correct because user space is not yet informed about the CPU being onlined, so nothing caan rely on RAPL being available on that particular CPU. Move the allocation to the CPU online callback and simplify the hotplug handling. At this point the package mapping is established and correct. This also adds a missing check for available package data in the event_init() function. Reported-by: Yasuaki Ishimatsu <yasu.isimatu@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sebastian Siewior <bigeasy@linutronix.de> Cc: Stephane Eranian <eranian@google.com> Cc: Vince Weaver <vincent.weaver@maine.edu> Fixes: 9d85eb9119f4 ("x86/smpboot: Make logical package management more robust") Link: http://lkml.kernel.org/r/20170131230141.212593966@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/perf/util/callchain.c')