/*
 * nop tracer
 *
 * Copyright (C) 2008 Steven Noonan <steven@uplinklabs.net>
 *
 */

#include <linux/module.h>
#include <linux/ftrace.h>

#include "trace.h"

/* Our two options */
enum {
	TRACE_NOP_OPT_ACCEPT = 0x1,
	TRACE_NOP_OPT_REFUSE = 0x2
};

/* Options for the tracer (see trace_options file) */
static struct tracer_opt nop_opts[] = {
	/* Option that will be accepted by set_flag callback */
	{ TRACER_OPT(test_nop_accept, TRACE_NOP_OPT_ACCEPT) },
	/* Option that will be refused by set_flag callback */
	{ TRACER_OPT(test_nop_refuse, TRACE_NOP_OPT_REFUSE) },
	{ } /* Always set a last empty entry */
};

static struct tracer_flags nop_flags = {
	/* You can check your flags value here when you want. */
	.val = 0, /* By default: all flags disabled */
	.opts = nop_opts
};

static struct trace_array	*ctx_trace;

static void start_nop_trace(struct trace_array *tr)
{
	/* Nothing to do! */
}

static void stop_nop_trace(struct trace_array *tr)
{
	/* Nothing to do! */
}

static int nop_trace_init(struct trace_array *tr)
{
	ctx_trace = tr;
	start_nop_trace(tr);
	return 0;
}

static void nop_trace_reset(struct trace_array *tr)
{
	stop_nop_trace(tr);
}

/* It only serves as a signal handler and a callback to
 * accept or refuse the setting of a flag.
 * If you don't implement it, then the flag setting will be
 * automatically accepted.
 */
static int nop_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
{
	/*
	 * Note that you don't need to update nop_flags.val yourself.
	 * The tracing Api will do it automatically if you return 0
	 */
	if (bit == TRACE_NOP_OPT_ACCEPT) {
		printk(KERN_DEBUG "nop_test_accept flag set to %d: we accept."
			" Now cat trace_options to see the result\n",
			set);
		return 0;
	}

	if (bit == TRACE_NOP_OPT_REFUSE) {
		printk(KERN_DEBUG "nop_test_refuse flag set to %d: we refuse."
			" Now cat trace_options to see the result\n",
			set);
		return -EINVAL;
	}

	return 0;
}


struct tracer nop_trace __read_mostly =
{
	.name		= "nop",
	.init		= nop_trace_init,
	.reset		= nop_trace_reset,
#ifdef CONFIG_FTRACE_SELFTEST
	.selftest	= trace_selftest_startup_nop,
#endif
	.flags		= &nop_flags,
	.set_flag	= nop_set_flag,
	.allow_instances = true,
};

t' action='/cgit.cgi/linux/net-next.git/log/drivers/usb/gadget/u_f.c'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=2e4333c14de06a333783d6812cf3c4998f78b0c8'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers?id=2e4333c14de06a333783d6812cf3c4998f78b0c8'>drivers</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb?id=2e4333c14de06a333783d6812cf3c4998f78b0c8'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/gadget?id=2e4333c14de06a333783d6812cf3c4998f78b0c8'>gadget</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/gadget/u_f.c?id=2e4333c14de06a333783d6812cf3c4998f78b0c8'>u_f.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='2e4333c14de06a333783d6812cf3c4998f78b0c8'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-11 10:17:39 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-11 10:17:39 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/gadget/u_f.c?id=2e4333c14de06a333783d6812cf3c4998f78b0c8'>2e4333c14de06a333783d6812cf3c4998f78b0c8</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/gadget/u_f.c?id=2e4333c14de06a333783d6812cf3c4998f78b0c8'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=2e4333c14de06a333783d6812cf3c4998f78b0c8'>368428514d70f34f2261c7f954f241f886d6bb51</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/gadget/u_f.c?id=2e4333c14de06a333783d6812cf3c4998f78b0c8'>drivers/usb/gadget/u_f.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/gadget/u_f.c?id=045169816b31b10faed984b01c390db1b32ee4c1'>045169816b31b10faed984b01c390db1b32ee4c1</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/gadget/u_f.c?id=2e4333c14de06a333783d6812cf3c4998f78b0c8&amp;id2=045169816b31b10faed984b01c390db1b32ee4c1'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/gadget/u_f.c?id=ba735155b9647b6167fd50276ca0fbfbce4e836c'>ba735155b9647b6167fd50276ca0fbfbce4e836c</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/gadget/u_f.c?id=2e4333c14de06a333783d6812cf3c4998f78b0c8&amp;id2=ba735155b9647b6167fd50276ca0fbfbce4e836c'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus</div><div class='commit-msg'>Pull MIPS fixes from Ralf Baechle:
 "Two more MIPS fixes for 4.9:

   - RTC: Return -ENODEV so an external RTC will be tried

   - Fix mask of GPE frequency

  These two have been tested on Imagination's automated test system and
  also both received positive reviews on the linux-mips mailing list"

* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
  MIPS: Lantiq: Fix mask of GPE frequency
  MIPS: Return -ENODEV from weak implementation of rtc_mips_set_time
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=2e4333c14de06a333783d6812cf3c4998f78b0c8'>Diffstat</a> (limited to 'drivers/usb/gadget/u_f.c')</div><table summary='diffstat' class='diffstat'>