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2012-03-07qeth: synchronize discipline module loadingFrank Blaschka
During system startup udev may try to configure devices in parallel so we have to synchronize discipline module loading. Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-07af_iucv: add shutdown for HS transportUrsula Braun
AF_IUCV sockets offer a shutdown function. This patch makes sure shutdown works for HS transport as well. Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-07af_iucv: handle netdev eventsUrsula Braun
In case of transport through HiperSockets the underlying network interface may switch to DOWN state or the underlying network device may recover. In both cases the socket must change to IUCV_DISCONN state. If the interface goes down, af_iucv has a chance to notify its connection peer in addition. Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-07Merge branch 'master' of git://1984.lsi.us.es/net-nextDavid S. Miller
2012-03-07tcp: md5: correct a RCU lockdep splatEric Dumazet
commit a8afca0329 (tcp: md5: protects md5sig_info with RCU) added a lockdep splat in tcp_md5_do_lookup() in case a timer fires a tcp retransmit. At this point, socket lock is owned by the sofirq handler, not the user, so we should adjust a bit the lockdep condition, as we dont hold rcu_read_lock(). Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Reported-by: Valdis Kletnieks <valdis.kletnieks@vt.edu> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-07netfilter: xt_LOG: add __printf() to sb_add()Eric Dumazet
Helps to find format mismatches at compile time Suggested-by: David Laight <David.Laight@ACULAB.COM> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
2012-03-07netfilter: xt_CT: allow to attach timeout policy + glue codePablo Neira Ayuso
This patch allows you to attach the timeout policy via the CT target, it adds a new revision of the target to ensure backward compatibility. Moreover, it also contains the glue code to stick the timeout object defined via nfnetlink_cttimeout to the given flow. Example usage (it requires installing the nfct tool and libnetfilter_cttimeout): 1) create the timeout policy: nfct timeout add tcp-policy0 inet tcp \ established 1000 close 10 time_wait 10 last_ack 10 2) attach the timeout policy to the packet: iptables -I PREROUTING -t raw -p tcp -j CT --timeout tcp-policy0 You have to install the following user-space software: a) libnetfilter_cttimeout: git://git.netfilter.org/libnetfilter_cttimeout b) nfct: git://git.netfilter.org/nfct You also have to get iptables with -j CT --timeout support. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-03-07netfilter: nf_ct_ext: add timeout extensionPablo Neira Ayuso
This patch adds the timeout extension, which allows you to attach specific timeout policies to flows. This extension is only used by the template conntrack. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-03-07netfilter: add cttimeout infrastructure for fine timeout tuningPablo Neira Ayuso
This patch adds the infrastructure to add fine timeout tuning over nfnetlink. Now you can use the NFNL_SUBSYS_CTNETLINK_TIMEOUT subsystem to create/delete/dump timeout objects that contain some specific timeout policy for one flow. The follow up patches will allow you attach timeout policy object to conntrack via the CT target and the conntrack extension infrastructure. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-03-07netfilter: nf_conntrack: pass timeout array to l4->new and l4->packetPablo Neira Ayuso
This patch defines a new interface for l4 protocol trackers: unsigned int *(*get_timeouts)(struct net *net); that is used to return the array of unsigned int that contains the timeouts that will be applied for this flow. This is passed to the l4proto->new(...) and l4proto->packet(...) functions to specify the timeout policy. This interface allows per-net global timeout configuration (although only DCCP supports this by now) and it will allow custom custom timeout configuration by means of follow-up patches. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-03-07netfilter: nf_ct_gre: add unsigned int array to define timeoutsPablo Neira Ayuso
This patch adds an array to define the default GRE timeouts. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-03-07netfilter: nf_ct_tcp: move retransmission and unacknowledged timeout to arrayPablo Neira Ayuso
This patch moves the retransmission and unacknowledged timeouts to the tcp_timeouts array. This change is required by follow-up patches. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-03-07netfilter: nf_ct_udp[lite]: convert UDP[lite] timeouts to arrayPablo Neira Ayuso
Use one array to store the UDP timeouts instead of two variables. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-03-07netfilter: ctnetlink: fix lockep splatsHans Schillstrom
net/netfilter/nf_conntrack_proto.c:70 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 1, debug_locks = 0 3 locks held by conntrack/3235: nfnl_lock+0x17/0x20 netlink_dump+0x32/0x240 ctnetlink_dump_table+0x3e/0x170 [nf_conntrack_netlink] stack backtrace: Pid: 3235, comm: conntrack Tainted: G W 3.2.0+ #511 Call Trace: [<ffffffff8108ce45>] lockdep_rcu_suspicious+0xe5/0x100 [<ffffffffa00ec6e1>] __nf_ct_l4proto_find+0x81/0xb0 [nf_conntrack] [<ffffffffa0115675>] ctnetlink_fill_info+0x215/0x5f0 [nf_conntrack_netlink] [<ffffffffa0115dc1>] ctnetlink_dump_table+0xd1/0x170 [nf_conntrack_netlink] [<ffffffff815fbdbf>] netlink_dump+0x7f/0x240 [<ffffffff81090f9d>] ? trace_hardirqs_on+0xd/0x10 [<ffffffff815fd34f>] netlink_dump_start+0xdf/0x190 [<ffffffffa0111490>] ? ctnetlink_change_nat_seq_adj+0x160/0x160 [nf_conntrack_netlink] [<ffffffffa0115cf0>] ? ctnetlink_get_conntrack+0x2a0/0x2a0 [nf_conntrack_netlink] [<ffffffffa0115ad9>] ctnetlink_get_conntrack+0x89/0x2a0 [nf_conntrack_netlink] [<ffffffff81603a47>] nfnetlink_rcv_msg+0x467/0x5f0 [<ffffffff81603a7c>] ? nfnetlink_rcv_msg+0x49c/0x5f0 [<ffffffff81603922>] ? nfnetlink_rcv_msg+0x342/0x5f0 [<ffffffff81071b21>] ? get_parent_ip+0x11/0x50 [<ffffffff816035e0>] ? nfnetlink_subsys_register+0x60/0x60 [<ffffffff815fed49>] netlink_rcv_skb+0xa9/0xd0 [<ffffffff81603475>] nfnetlink_rcv+0x15/0x20 [<ffffffff815fe70e>] netlink_unicast+0x1ae/0x1f0 [<ffffffff815fea16>] netlink_sendmsg+0x2c6/0x320 [<ffffffff815b2a87>] sock_sendmsg+0x117/0x130 [<ffffffff81125093>] ? might_fault+0x53/0xb0 [<ffffffff811250dc>] ? might_fault+0x9c/0xb0 [<ffffffff81125093>] ? might_fault+0x53/0xb0 [<ffffffff815b5991>] ? move_addr_to_kernel+0x71/0x80 [<ffffffff815b644e>] sys_sendto+0xfe/0x130 [<ffffffff815b5c94>] ? sys_bind+0xb4/0xd0 [<ffffffff817a8a0e>] ? retint_swapgs+0xe/0x13 [<ffffffff817afcd2>] system_call_fastpath+0x16/0x1b Reported-by: Hans Schillstrom <hans.schillstrom@ericsson.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Hans Schillstrom <hans.schillstrom@ericsson.com>
2012-03-07netfilter: xt_LOG: fix bogus extra layer-4 logging informationRichard Weinberger
In 16059b5 netfilter: merge ipt_LOG and ip6_LOG into xt_LOG, we have merged ipt_LOG and ip6t_LOG. However: IN=wlan0 OUT= MAC=xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx SRC=213.150.61.61 DST=192.168.1.133 LEN=40 TOS=0x00 PREC=0x00 TTL=117 ID=10539 DF PROTO=TCP SPT=80 DPT=49013 WINDOW=0 RES=0x00 ACK RST URGP=0 PROTO=UDPLITE SPT=80 DPT=49013 LEN=45843 PROTO=ICMP TYPE=0 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Several missing break in the code led to including bogus layer-4 information. This patch fixes this problem. Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-03-07netfilter: remove ipt_SAME.h and ipt_realm.hWANG Cong
These two headers are not required anymore, they have been replaced by xt_SAME.h and xt_realm.h. Florian Westphal pointed out this. Cc: "David S. Miller" <davem@davemloft.net> Cc: Florian Westphal <fw@strlen.de> Signed-off-by: WANG Cong <xiyou.wangcong@gmail. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-03-07netfilter: nf_ct_ecache: refactor nf_ct_deliver_cached_eventsTony Zelenoff
* identation lowered * some CPU cycles saved at delayed item variable initialization Signed-off-by: Tony Zelenoff <antonz@parallels.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-03-07netfilter: nf_ct_ecache: trailing whitespace removedTony Zelenoff
Signed-off-by: Tony Zelenoff <antonz@parallels.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-03-07netfilter: merge ipt_LOG and ip6_LOG into xt_LOGRichard Weinberger
ipt_LOG and ip6_LOG have a lot of common code, merge them to reduce duplicate code. Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-03-07netfilter: ctnetlink: allow to set expectfn for expectationsPablo Neira Ayuso
This patch allows you to set expectfn which is specifically used by the NAT side of most of the existing conntrack helpers. I have added a symbol map that uses a string as key to look up for the function that is attached to the expectation object. This is the best solution I came out with to solve this issue. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-03-07netfilter: ctnetlink: add NAT support for expectationsPablo Neira Ayuso
This patch adds the missing bits to create expectations that are created in NAT setups.
2012-03-07netfilter: ctnetlink: allow to set expectation classPablo Neira Ayuso
This patch allows you to set the expectation class. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-03-07netfilter: ctnetlink: allow to set helper for new expectationsPablo Neira Ayuso
This patch allow you to set the helper for newly created expectations based of the CTA_EXPECT_HELP_NAME attribute. Before this, the helper set was NULL. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-03-07netfilter: ipset: hash:net,iface timeout bug fixedJozsef Kadlecsik
Timed out entries were still matched till the garbage collector purged them out. The fix is verified in the testsuite. Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-03-07netfilter: ipset: Exceptions support added to hash:*net* typesJozsef Kadlecsik
The "nomatch" keyword and option is added to the hash:*net* types, by which one can add exception entries to sets. Example: ipset create test hash:net ipset add test 192.168.0/24 ipset add test 192.168.0/30 nomatch In this case the IP addresses from 192.168.0/24 except 192.168.0/30 match the elements of the set. Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-03-07netfilter: ipset: Log warning when a hash type of set gets fullJozsef Kadlecsik
If the set is full, the SET target cannot add more elements. Log warning so that the admin got notified about it. Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-03-07netfilter: ipset: expose userspace-relevant parts in ip_set.hJan Engelhardt
iptables's libxt_SET.c depends on these. Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-03-07netfilter: ipset: use NFPROTO_ constantsJan Engelhardt
ipset is actually using NFPROTO values rather than AF (xt_set passes that along). Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2012-03-06powerpc/44x: Add more changes for APM821XX EMAC driverDuc Dang
This patch includes: Configure EMAC PHY clock source (clock from PHY or internal clock). Do not advertise PHY half duplex capability as APM821XX EMAC does not support half duplex mode. Add changes to support configuring jumbo frame for APM821XX EMAC. [ Fix coding style -DaveM ] Signed-off-by: Duc Dang <dhdang@apm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-06powerpc/44x: Add new compatible value for EMAC node of APM821XX dts file.Duc Dang
This compatible value will be used to distinguish some special features of APM821XX EMAC: no half duplex mode support, configuring jumbo frame. Signed-off-by: Duc Dang <dhdang@apm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-06net: Use bool for return value of dev_valid_name().David S. Miller
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-06net/mlx4: defining functions as staticYevgeny Petrilin
Fixing sparse warnings, the 2 functions are only used in same file. Defining them as static and not exporting them. Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-06net/mlx4: remove unused functionsYevgeny Petrilin
Removing functions that are no longer in use, but still exist Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-06net/mlx4: fixing sparse warnings for not declared, functionsYevgeny Petrilin
The SET_PORT functions are implemented in port.c, which is part of mlx4_core, these functions are exported. The functions are in use by the mlx4_en module (were originally part of mlx4_en). Their declaration remained in mlx4_en module, moving the declaration to the right location. Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-06net/mlx4: fixing sparse warnings when copying mac, address to gid entryYevgeny Petrilin
The mac should be written as __be64 the gid. The warning was because we changed the mac parameter, which is u64, by writing result of cpu_to_be64 into it. Fixing by using new variable of type __be64. Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-06net/mlx4: fix sparse warnings on wrong type for RSS keysYevgeny Petrilin
The keys used for the hardware RSS topelitz hash are of type __be32 where the values provided by the driver are from array of u32, this triggered sparse warning on incorrect type in assignment as of different base types. Since these values are picked randomly, the fix is to transform the key to __be32 by executing cpu_to_be_32() Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-06net/mlx4: fix sparse warnings on TX blue flame bufferOr Gerlitz
The blue flame buffer is defined to be of type void __iomem * but was passed to mlx4_bf_copy which gets unsigned long * . This triggered sparse warning on different address spaces, fix that by changing mlx4_bf_copy first param to be of type void __iomem * . Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-06net/mlx4: fix sparse warnings on TX control flags, endianessOr Gerlitz
Fix sparse warnings on incompatibility between the endianess of the ctrl_flags field of struct mlx4_en_priv to the srcrb_flags field of struct mlx4_wqe_ctrl_seg by changing the former to be __be32 instead of u32. Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-06net/mlx4_en: Saving mem access on data pathYevgeny Petrilin
Localized the pdev->dev, and using dma_map instead of pci_map There are multiple map/unmap operations on data path, optimizing those by saving redundant pointer access. Those places were identified as hot-spots when running kernel profiling during some benchmarks. The fixes had most impact when testing packet rate with small packets, reducing several % from CPU load, and in some case being the difference between reaching wire speed or being CPU bound. Signed-off-by: Yevgeny Petrilin <yevgenyp@mellanox.co.il> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-06qla3xxx: ethernet: Silence static checker warning.Santosh Nayak
Silence the following warning: "warn: returning -1 instead of -ENOMEM is sloppy". Signed-off-by: Santosh Nayak <santoshprasadnayak@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-068139too: Add 64bit statisticsJunchang Wang
Switch to use ndo_get_stats64 to get 64bit statistics. Two sync entries are used (one for Rx and one for Tx). Signed-off-by: Junchang Wang <junchangwang@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-05Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
Conflicts: drivers/net/vmxnet3/vmxnet3_drv.c Small vmxnet3 conflict with header size bug fix in 'net'. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-03-05Merge branch 'perf-urgent-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull perf fixes from Ingo Molnar: "It contains three cherry-picked fixes from perf/core, which turned out to be more urgent than we originally thought." * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf tools: Handle kernels that don't support attr.exclude_{guest,host} perf tools: Change perf_guest default back to false perf record: No build id option fails
2012-03-05Merge tag 'usb-3.3-rc6' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb USB: revert a powerpc EHCI patch There is just one patch in here, a revert of a powerpc EHCI driver patch that was reported to cause problems. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> * tag 'usb-3.3-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: Revert "powerpc/usb: fix issue of CPU halt when missing USB PHY clock"
2012-03-05Merge tag 'tty-3.3-rc6' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty tty: build fix for 3.3-rc6 This contains one build fix for the powerpc udbg driver that was reported. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> * tag 'tty-3.3-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: tty/powerpc: early udbg consoles can't be modules
2012-03-05Merge tag 'md-3.3-fixes' of git://neil.brown.name/mdLinus Torvalds
Pull md fixes from Neil Brown: "Three fixes for md in 3.3-rc: Two relate to the recently added drive replacement. One fixes the problem where a read error in RAID10 would sometimes be retried indefinitely." * tag 'md-3.3-fixes' of git://neil.brown.name/md: md/raid10: fix assembling of arrays with replacement devices. md/raid10: fix handling of error on last working device in array. md/raid1: fix buglet in md_raid1_contested.
2012-03-05Merge branch 'akpm' (Andrew's patch bomb)Linus Torvalds
Merge the emailed seties of 19 patches from Andrew Morton * akpm: rapidio/tsi721: fix queue wrapping bug in inbound doorbell handler memcg: fix mapcount check in move charge code for anonymous page mm: thp: fix BUG on mm->nr_ptes alpha: fix 32/64-bit bug in futex support memcg: fix GPF when cgroup removal races with last exit debugobjects: Fix selftest for static warnings floppy/scsi: fix setting of BIO flags memcg: fix deadlock by inverting lrucare nesting drivers/rtc/rtc-r9701.c: fix crash in r9701_remove() c2port: class_create() returns an ERR_PTR pps: class_create() returns an ERR_PTR, not NULL hung_task: fix the broken rcu_lock_break() logic vfork: kill PF_STARTING coredump_wait: don't call complete_vfork_done() vfork: make it killable vfork: introduce complete_vfork_done() aio: wake up waiters when freeing unused kiocbs kprobes: return proper error code from register_kprobe() kmsg_dump: don't run on non-error paths by default
2012-03-05rapidio/tsi721: fix queue wrapping bug in inbound doorbell handlerAlexandre Bounine
Fix a bug that causes a kernel panic when the number of received doorbells is larger than number of entries in the inbound doorbell queue (current default value = 512). Another possible indication for this bug is large number of spurious doorbells reported by tsi721 driver after reaching the queue size maximum. Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com> Cc: Chul Kim <chul.kim@idt.com> Cc: Matt Porter <mporter@kernel.crashing.org> Cc: <stable@vger.kernel.org> [3.2.x+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-03-05memcg: fix mapcount check in move charge code for anonymous pageNaoya Horiguchi
Currently the charge on shared anonyous pages is supposed not to moved in task migration. To implement this, we need to check that mapcount > 1, instread of > 2. So this patch fixes it. Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Reviewed-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Hillf Danton <dhillf@gmail.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-03-05mm: thp: fix BUG on mm->nr_ptesAndrea Arcangeli
Dave Jones reports a few Fedora users hitting the BUG_ON(mm->nr_ptes...) in exit_mmap() recently. Quoting Hugh's discovery and explanation of the SMP race condition: "mm->nr_ptes had unusual locking: down_read mmap_sem plus page_table_lock when incrementing, down_write mmap_sem (or mm_users 0) when decrementing; whereas THP is careful to increment and decrement it under page_table_lock. Now most of those paths in THP also hold mmap_sem for read or write (with appropriate checks on mm_users), but two do not: when split_huge_page() is called by hwpoison_user_mappings(), and when called by add_to_swap(). It's conceivable that the latter case is responsible for the exit_mmap() BUG_ON mm->nr_ptes that has been reported on Fedora." The simplest way to fix it without having to alter the locking is to make split_huge_page() a noop in nr_ptes terms, so by counting the preallocated pagetables that exists for every mapped hugepage. It was an arbitrary choice not to count them and either way is not wrong or right, because they are not used but they're still allocated. Reported-by: Dave Jones <davej@redhat.com> Reported-by: Hugh Dickins <hughd@google.com> Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Acked-by: Hugh Dickins <hughd@google.com> Cc: David Rientjes <rientjes@google.com> Cc: Josh Boyer <jwboyer@redhat.com> Cc: <stable@vger.kernel.org> [3.0.x, 3.1.x, 3.2.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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