#undef TRACE_SYSTEM
#define TRACE_SYSTEM lock

#if !defined(_TRACE_LOCK_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_LOCK_H

#include <linux/lockdep.h>
#include <linux/tracepoint.h>

#ifdef CONFIG_LOCKDEP

TRACE_EVENT(lock_acquire,

	TP_PROTO(struct lockdep_map *lock, unsigned int subclass,
		int trylock, int read, int check,
		struct lockdep_map *next_lock, unsigned long ip),

	TP_ARGS(lock, subclass, trylock, read, check, next_lock, ip),

	TP_STRUCT__entry(
		__field(unsigned int, flags)
		__string(name, lock->name)
		__field(void *, lockdep_addr)
	),

	TP_fast_assign(
		__entry->flags = (trylock ? 1 : 0) | (read ? 2 : 0);
		__assign_str(name, lock->name);
		__entry->lockdep_addr = lock;
	),

	TP_printk("%p %s%s%s", __entry->lockdep_addr,
		  (__entry->flags & 1) ? "try " : "",
		  (__entry->flags & 2) ? "read " : "",
		  __get_str(name))
);

DECLARE_EVENT_CLASS(lock,

	TP_PROTO(struct lockdep_map *lock, unsigned long ip),

	TP_ARGS(lock, ip),

	TP_STRUCT__entry(
		__string(	name, 	lock->name	)
		__field(	void *, lockdep_addr	)
	),

	TP_fast_assign(
		__assign_str(name, lock->name);
		__entry->lockdep_addr = lock;
	),

	TP_printk("%p %s",  __entry->lockdep_addr, __get_str(name))
);

DEFINE_EVENT(lock, lock_release,

	TP_PROTO(struct lockdep_map *lock, unsigned long ip),

	TP_ARGS(lock, ip)
);

#ifdef CONFIG_LOCK_STAT

DEFINE_EVENT(lock, lock_contended,

	TP_PROTO(struct lockdep_map *lock, unsigned long ip),

	TP_ARGS(lock, ip)
);

DEFINE_EVENT(lock, lock_acquired,

	TP_PROTO(struct lockdep_map *lock, unsigned long ip),

	TP_ARGS(lock, ip)
);

#endif
#endif

#endif /* _TRACE_LOCK_H */

/* This part must be outside protection */
#include <trace/define_trace.h>
-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>refs</a><a href='/cgit.cgi/linux/net-next.git/log/net/ipv6/ip6_flowlabel.c?h=nds-private-remove'>log</a><a href='/cgit.cgi/linux/net-next.git/tree/net/ipv6/ip6_flowlabel.c?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>tree</a><a class='active' href='/cgit.cgi/linux/net-next.git/commit/net/ipv6/ip6_flowlabel.c?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/net/ipv6/ip6_flowlabel.c?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/net/ipv6/ip6_flowlabel.c'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/ipv6?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>ipv6</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/ipv6/ip6_flowlabel.c?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>ip6_flowlabel.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='433e19cf33d34bb6751c874a9c00980552fe508c'/><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>Dexuan Cui &lt;decui@microsoft.com&gt;</td><td class='right'>2017-01-28 11:46:02 -0700</td></tr>
<tr><th>committer</th><td>Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;</td><td class='right'>2017-01-31 10:59:48 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/ipv6/ip6_flowlabel.c?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>433e19cf33d34bb6751c874a9c00980552fe508c</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/ipv6/ip6_flowlabel.c?id=433e19cf33d34bb6751c874a9c00980552fe508c'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>ce6547ef2987fbb289fa28f03536328a42781651</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/ipv6/ip6_flowlabel.c?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>net/ipv6/ip6_flowlabel.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/ipv6/ip6_flowlabel.c?h=nds-private-remove&amp;id=191e885a2e130e639bb0c8ee350d7047294f2ce6'>191e885a2e130e639bb0c8ee350d7047294f2ce6</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/ipv6/ip6_flowlabel.c?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c&amp;id2=191e885a2e130e639bb0c8ee350d7047294f2ce6'>diff</a>)</td></tr></table>
<div class='commit-subject'>Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()</div><div class='commit-msg'>Commit a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in
hv_need_to_signal_on_read()")
added the proper mb(), but removed the test "prev_write_sz &lt; pending_sz"
when making the signal decision.

As a result, the guest can signal the host unnecessarily,
and then the host can throttle the guest because the host
thinks the guest is buggy or malicious; finally the user
running stress test can perceive intermittent freeze of
the guest.

This patch brings back the test, and properly handles the
in-place consumption APIs used by NetVSC (see get_next_pkt_raw(),
put_pkt_raw() and commit_rd_index()).

Fixes: a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in
hv_need_to_signal_on_read()")

Signed-off-by: Dexuan Cui &lt;decui@microsoft.com&gt;
Reported-by: Rolf Neugebauer &lt;rolf.neugebauer@docker.com&gt;
Tested-by: Rolf Neugebauer &lt;rolf.neugebauer@docker.com&gt;
Cc: "K. Y. Srinivasan" &lt;kys@microsoft.com&gt;
Cc: Haiyang Zhang &lt;haiyangz@microsoft.com&gt;
Cc: Stephen Hemminger &lt;sthemmin@microsoft.com&gt;
Cc: &lt;stable@vger.kernel.org&gt;
Signed-off-by: K. Y. Srinivasan &lt;kys@microsoft.com&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>Diffstat</a> (limited to 'net/ipv6/ip6_flowlabel.c')</div><table summary='diffstat' class='diffstat'>