/*
 * netsniff-ng - the packet sniffing beast
 * Copyright 2009 - 2013 Daniel Borkmann.
 * Subject to the GPL, version 2.
 */

#ifndef DISSECTOR_H
#define DISSECTOR_H

#include <stdlib.h>
#include <stdint.h>
#include <sys/socket.h>
#include <linux/if.h>
#include <linux/netlink.h>
#include <linux/if_packet.h>

#include "ring.h"
#include "tprintf.h"
#include "linktype.h"
#include "vlan.h"

#define PRINT_NORM		0
#define PRINT_LESS		1
#define PRINT_HEX		2
#define PRINT_ASCII		3
#define PRINT_HEX_ASCII		4
#define PRINT_NONE		5

extern char *if_indextoname(unsigned ifindex, char *ifname);

static const char * const packet_types[256] = {
	[PACKET_HOST]		=	"<",  /* Incoming */
	[PACKET_BROADCAST]	=	"B",  /* Broadcast */
	[PACKET_MULTICAST]	=	"M",  /* Multicast */
	[PACKET_OTHERHOST]	=	"P",  /* Promisc */
	[PACKET_OUTGOING]	=	">",  /* Outgoing */
	[PACKET_USER]		=	"K->U", /* To Userspace */
	[PACKET_KERNEL]		=	"U->K", /* To Kernelspace */
};

static inline const char *__show_ts_source(uint32_t status)
{
	if (status & TP_STATUS_TS_RAW_HARDWARE)
		return "(raw hw ts)";
	else if (status & TP_STATUS_TS_SYS_HARDWARE)
		return "(sys hw ts)";
	else if (status & TP_STATUS_TS_SOFTWARE)
		return "(sw ts)";
	else
		return "";
}

static inline void __show_frame_hdr(uint8_t *packet, size_t len, int linktype,
				    struct sockaddr_ll *s_ll, void *raw_hdr,
				    int mode, bool v3, unsigned long count)
{
	char tmp[IFNAMSIZ];
	union tpacket_uhdr hdr;
	uint8_t pkttype = s_ll->sll_pkttype;
	bool is_nl;

	if (mode == PRINT_NONE)
		return;

	/*
	 * If we're capturing on nlmon0, all packets will have sll_pkttype set
	 * to PACKET_OUTGOING, but we actually want PACKET_USER/PACKET_KERNEL as
	 * it originally was set in the kernel. Thus, use nlmsghdr->nlmsg_pid to
	 * restore the type.
	 */
	is_nl = (linktype == LINKTYPE_NETLINK && len >= sizeof(struct nlmsghdr));
	if (is_nl && pkttype == PACKET_OUTGOING) {
		struct nlmsghdr *hdr = (struct nlmsghdr *) packet;
		pkttype = hdr->nlmsg_pid == 0 ? PACKET_KERNEL : PACKET_USER;
	}

	hdr.raw = raw_hdr;
	switch (mode) {
	case PRINT_LESS:
		tprintf("%s %s %u #%lu",
			packet_types[pkttype] ? : "?",
			if_indextoname(s_ll->sll_ifindex, tmp) ? : "?",
			tpacket_uhdr(hdr, tp_len, v3),
			count);
		break;
	default:
		tprintf("%s %s %u %us.%uns #%lu %s\n",
			packet_types[pkttype] ? : "?",
			if_indextoname(s_ll->sll_ifindex, tmp) ? : "?",
			tpacket_uhdr(hdr, tp_len, v3),
			tpacket_uhdr(hdr, tp_sec, v3),
			tpacket_uhdr(hdr, tp_nsec, v3),
			count,
			v3 ? "" : __show_ts_source(hdr.h2->tp_status));

		if (tpacket_has_vlan_info(&hdr)) {
			uint16_t tci = tpacket_uhdr_vlan_tci(&hdr, v3);

			tprintf(" [ tpacketv3 VLAN ");
			tprintf("Prio (%u), ", vlan_tci2prio(tci));
			tprintf("CFI (%u), ", vlan_tci2cfi(tci));
			tprintf("ID (%u), ", vlan_tci2vid(tci));
			tprintf("Proto (0x%.4x)", tpacket_uhdr_vlan_proto(&hdr, v3));
			tprintf(" ]\n");
		}
		break;
	}
}

static inline void show_frame_hdr(uint8_t *packet, size_t len, int linktype,
				  struct frame_map *hdr, int mode,
				  unsigned long count)
{
	__show_frame_hdr(packet, len, linktype, &hdr->s_ll, &hdr->tp_h, mode,
			 false, count);
}

extern void dissector_init_all(int fnttype);
extern void dissector_entry_point(uint8_t *packet, size_t len, int linktype,
				  int mode, struct sockaddr_ll *sll);
extern void dissector_cleanup_all(void);
extern int dissector_set_print_type(void *ptr, int type);

#endif /* DISSECTOR_H */
d=20ab67a563f5299c09a234164c372aba5a59add8'>codecs</a>/<a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/codecs/ad193x-spi.c?h=nds-private-remove&amp;id=20ab67a563f5299c09a234164c372aba5a59add8'>ad193x-spi.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='20ab67a563f5299c09a234164c372aba5a59add8'/><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>Michal Hocko &lt;mhocko@suse.com&gt;</td><td class='right'>2016-12-02 17:26:45 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-02 18:48:03 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/codecs/ad193x-spi.c?h=nds-private-remove&amp;id=20ab67a563f5299c09a234164c372aba5a59add8'>20ab67a563f5299c09a234164c372aba5a59add8</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound/soc/codecs/ad193x-spi.c?id=20ab67a563f5299c09a234164c372aba5a59add8'>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=20ab67a563f5299c09a234164c372aba5a59add8'>319ffd0791411bbe39f64941899a14ca23454cd8</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound/soc/codecs/ad193x-spi.c?h=nds-private-remove&amp;id=20ab67a563f5299c09a234164c372aba5a59add8'>sound/soc/codecs/ad193x-spi.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/codecs/ad193x-spi.c?h=nds-private-remove&amp;id=8dc0f265d39a3933f4c1f846c7c694f12a2ab88a'>8dc0f265d39a3933f4c1f846c7c694f12a2ab88a</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/soc/codecs/ad193x-spi.c?h=nds-private-remove&amp;id=20ab67a563f5299c09a234164c372aba5a59add8&amp;id2=8dc0f265d39a3933f4c1f846c7c694f12a2ab88a'>diff</a>)</td></tr></table>
<div class='commit-subject'>mm: workingset: fix NULL ptr in count_shadow_nodes</div><div class='commit-msg'>Commit 0a6b76dd23fa ("mm: workingset: make shadow node shrinker memcg
aware") has made the workingset shadow nodes shrinker memcg aware.  The
implementation is not correct though because memcg_kmem_enabled() might
become true while we are doing a global reclaim when the sc-&gt;memcg might
be NULL which is exactly what Marek has seen:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000400
  IP: [&lt;ffffffff8122d520&gt;] mem_cgroup_node_nr_lru_pages+0x20/0x40
  PGD 0
  Oops: 0000 [#1] SMP
  CPU: 0 PID: 60 Comm: kswapd0 Tainted: G           O   4.8.10-12.pvops.qubes.x86_64 #1
  task: ffff880011863b00 task.stack: ffff880011868000
  RIP: mem_cgroup_node_nr_lru_pages+0x20/0x40
  RSP: e02b:ffff88001186bc70  EFLAGS: 00010293
  RAX: 0000000000000000 RBX: ffff88001186bd20 RCX: 0000000000000002
  RDX: 000000000000000c RSI: 0000000000000000 RDI: 0000000000000000
  RBP: ffff88001186bc70 R08: 28f5c28f5c28f5c3 R09: 0000000000000000
  R10: 0000000000006c34 R11: 0000000000000333 R12: 00000000000001f6
  R13: ffffffff81c6f6a0 R14: 0000000000000000 R15: 0000000000000000
  FS:  0000000000000000(0000) GS:ffff880013c00000(0000) knlGS:ffff880013d00000
  CS:  e033 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: 0000000000000400 CR3: 00000000122f2000 CR4: 0000000000042660
  Call Trace:
    count_shadow_nodes+0x9a/0xa0
    shrink_slab.part.42+0x119/0x3e0
    shrink_node+0x22c/0x320
    kswapd+0x32c/0x700
    kthread+0xd8/0xf0
    ret_from_fork+0x1f/0x40
  Code: 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 3b 35 dd eb b1 00 55 48 89 e5 73 2c 89 d2 31 c9 31 c0 4c 63 ce 48 0f a3 ca 73 13 &lt;4a&gt; 8b b4 cf 00 04 00 00 41 89 c8 4a 03 84 c6 80 00 00 00 83 c1
  RIP  mem_cgroup_node_nr_lru_pages+0x20/0x40
   RSP &lt;ffff88001186bc70&gt;
  CR2: 0000000000000400
  ---[ end trace 100494b9edbdfc4d ]---

This patch fixes the issue by checking sc-&gt;memcg rather than
memcg_kmem_enabled() which is sufficient because shrink_slab makes sure
that only memcg aware shrinkers will get non-NULL memcgs and only if
memcg_kmem_enabled is true.

Fixes: 0a6b76dd23fa ("mm: workingset: make shadow node shrinker memcg aware")
Link: http://lkml.kernel.org/r/20161201132156.21450-1-mhocko@kernel.org
Signed-off-by: Michal Hocko &lt;mhocko@suse.com&gt;
Reported-by: Marek Marczykowski-Górecki &lt;marmarek@mimuw.edu.pl&gt;
Tested-by: Marek Marczykowski-Górecki &lt;marmarek@mimuw.edu.pl&gt;
Acked-by: Vladimir Davydov &lt;vdavydov.dev@gmail.com&gt;
Acked-by: Johannes Weiner &lt;hannes@cmpxchg.org&gt;
Acked-by: Balbir Singh &lt;bsingharora@gmail.com&gt;
Cc: &lt;stable@vger.kernel.org&gt;	[4.6+]
Signed-off-by: Andrew Morton &lt;akpm@linux-foundation.org&gt;
Signed-off-by: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=20ab67a563f5299c09a234164c372aba5a59add8'>Diffstat</a> (limited to 'sound/soc/codecs/ad193x-spi.c')</div><table summary='diffstat' class='diffstat'>