- 17 Nov, 2016 20 commits
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Steve Wise authored
Also, rearrange things a bit to have a common c4iw_invalidate_mr() function used everywhere that we need to invalidate. Fixes: 49b53a93 ("iw_cxgb4: add fast-path for small REG_MR operations") Signed-off-by:
Steve Wise <swise@opengridcomputing.com> Signed-off-by:
Doug Ledford <dledford@redhat.com>
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Steve Wise authored
There are a few cases in c4iw_post_send() and c4iw_post_receive() where *bad_wr is not set when an error is returned. This can cause a crash if the application tries to use bad_wr. Signed-off-by:
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Doug Ledford authored
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Yonatan Cohen authored
The method rxe_qp_error() transitions QP to error state and make sure the QP is drained. It did not though update the QP state for user's query. This patch fixes this. Fixes: 8700e3e7 ("Soft RoCE driver") Signed-off-by:
Yonatan Cohen <yonatanc@mellanox.com> Reviewed-by:
Moni Shoua <monis@mellanox.com> Signed-off-by:
Leon Romanovsky <leon@kernel.org> Signed-off-by:
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Yonatan Cohen authored
RXE resets the send-q only once in rxe_qp_init_req() when QP is created, but when the QP is reused after QP reset, the send-q holds previous garbage data. This garbage data wrongly fails CQEs that otherwise should have completed successfully. Fixes: 8700e3e7 ("Soft RoCE driver") Signed-off-by:
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Yonatan Cohen authored
To correctly handle a erroneous WR this fix does the following 1. Make sure the bad WQE causes a user completion event. 2. Call rxe_completer to handle the erred WQE. Before the fix, when rxe_requester found a bad WQE, it changed its status to IB_WC_LOC_PROT_ERR and exit with 0 for non RC QPs. If this was the 1st WQE then there would be no ACK to invoke the completer and this bad WQE would be stuck in the QP's send-q. On top of that the requester exiting with 0 caused rxe_do_task to endlessly invoke rxe_requester, resulting in a soft-lockup attached below. In case the WQE was not the 1st and rxe_completer did get a chance to handle the bad WQE, it did not cause a complete event since the WQE's IB_SEND_SIGNALED flag was not set. Setting WQE status to IB_SEND_SIGNALED is subject to IBA spec version 1.2.1, section 10.7.3.1 Signaled Completions. NMI watchdog: BUG: soft lockup - CPU#7 stuck for 22s! [<ffffffffa0590145>] ? rxe_pool_get_index+0x35/0xb0 [rdma_rxe] [<ffffffffa05952ec>] lookup_mem+0x3c/0xc0 [rdma_rxe] [<ffffffffa0595534>] copy_data+0x1c4/0x230 [rdma_rxe] [<ffffffffa058c180>] rxe_requester+0x9d0/0x1100 [rdma_rxe] [<ffffffff8158e98a>] ? kfree_skbmem+0x5a/0x60 [<ffffffffa05962c9>] rxe_do_task+0x89/0xf0 [rdma_rxe] [<ffffffffa05963e2>] rxe_run_task+0x12/0x30 [rdma_rxe] [<ffffffffa059110a>] rxe_post_send+0x41a/0x550 [rdma_rxe] [<ffffffff811ef922>] ? __kmalloc+0x182/0x200 [<ffffffff816ba512>] ? down_read+0x12/0x40 [<ffffffffa054bd32>] ib_uverbs_post_send+0x532/0x540 [ib_uverbs] [<ffffffff815f8722>] ? tcp_sendmsg+0x402/0xb80 [<ffffffffa05453dc>] ib_uverbs_write+0x18c/0x3f0 [ib_uverbs] [<ffffffff81623c2e>] ? inet_recvmsg+0x7e/0xb0 [<ffffffff8158764d>] ? sock_recvmsg+0x3d/0x50 [<ffffffff81215b87>] __vfs_write+0x37/0x140 [<ffffffff81216892>] vfs_write+0xb2/0x1b0 [<ffffffff81217ce5>] SyS_write+0x55/0xc0 [<ffffffff816bc672>] entry_SYSCALL_64_fastpath+0x1a/0xa Fixes: 8700e3e7 ("Soft RoCE driver") Signed-off-by:
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Yonatan Cohen authored
Missing initialization of udp_tunnel_sock_cfg causes to following kernel panic, while kernel tries to execute gro_receive(). While being there, we converted udp_port_cfg to use the same initialization scheme as udp_tunnel_sock_cfg. ------------[ cut here ]------------ kernel tried to execute NX-protected page - exploit attempt? (uid: 0) BUG: unable to handle kernel paging request at ffffffffa0588c50 IP: [<ffffffffa0588c50>] __this_module+0x50/0xffffffffffff8400 [ib_rxe] PGD 1c09067 PUD 1c0a063 PMD bb394067 PTE 80000000ad5e8163 Oops: 0011 [#1] SMP Modules linked in: ib_rxe ip6_udp_tunnel udp_tunnel CPU: 5 PID: 0 Comm: swapper/5 Not tainted 4.7.0-rc3+ #2 Hardware name: Red Hat KVM, BIOS Bochs 01/01/2011 task: ffff880235e4e680 ti: ffff880235e68000 task.ti: ffff880235e68000 RIP: 0010:[<ffffffffa0588c50>] [<ffffffffa0588c50>] __this_module+0x50/0xffffffffffff8400 [ib_rxe] RSP: 0018:ffff880237343c80 EFLAGS: 00010282 RAX: 00000000dffe482d RBX: ffff8800ae330900 RCX: 000000002001b712 RDX: ffff8800ae330900 RSI: ffff8800ae102578 RDI: ffff880235589c00 RBP: ffff880237343cb0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8800ae33e262 R13: ffff880235589c00 R14: 0000000000000014 R15: ffff8800ae102578 FS: 0000000000000000(0000) GS:ffff880237340000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffa0588c50 CR3: 0000000001c06000 CR4: 00000000000006e0 Stack: ffffffff8160860e ffff8800ae330900 ffff8800ae102578 0000000000000014 000000000000004e ffff8800ae102578 ffff880237343ce0 ffffffff816088fb 0000000000000000 ffff8800ae330900 0000000000000000 00000000ffad0000 Call Trace: <IRQ> [<ffffffff8160860e>] ? udp_gro_receive+0xde/0x130 [<ffffffff816088fb>] udp4_gro_receive+0x10b/0x2d0 [<ffffffff81611373>] inet_gro_receive+0x1d3/0x270 [<ffffffff81594e29>] dev_gro_receive+0x269/0x3b0 [<ffffffff81595188>] napi_gro_receive+0x38/0x120 [<ffffffffa011caee>] mlx5e_handle_rx_cqe+0x27e/0x340 [mlx5_core] [<ffffffffa011d076>] mlx5e_poll_rx_cq+0x66/0x6d0 [mlx5_core] [<ffffffffa011d7ae>] mlx5e_napi_poll+0x8e/0x400 [mlx5_core] [<ffffffff815949a0>] net_rx_action+0x160/0x380 [<ffffffff816a9197>] __do_softirq+0xd7/0x2c5 [<ffffffff81085c35>] irq_exit+0xf5/0x100 [<ffffffff816a8f16>] do_IRQ+0x56/0xd0 [<ffffffff816a6dcc>] common_interrupt+0x8c/0x8c <EOI> [<ffffffff81061f96>] ? native_safe_halt+0x6/0x10 [<ffffffff81037ade>] default_idle+0x1e/0xd0 [<ffffffff8103828f>] arch_cpu_idle+0xf/0x20 [<ffffffff810c37dc>] default_idle_call+0x3c/0x50 [<ffffffff810c3b13>] cpu_startup_entry+0x323/0x3c0 [<ffffffff81050d8c>] start_secondary+0x15c/0x1a0 RIP [<ffffffffa0588c50>] __this_module+0x50/0xffffffffffff8400 [ib_rxe] RSP <ffff880237343c80> CR2: ffffffffa0588c50 ---[ end trace 489ee31fa7614ac5 ]--- Kernel panic - not syncing: Fatal exception in interrupt Kernel Offset: disabled ---[ end Kernel panic - not syncing: Fatal exception in interrupt ------------[ cut here ]------------ Fixes: 8700e3e7 ("Soft RoCE driver") Signed-off-by:
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Matan Barak authored
Currently, if ib_copy_to_udata fails, the CQ won't be deleted from the radix tree and the HW (HW2SW). Fixes: 225c7b1f ('IB/mlx4: Add a driver Mellanox ConnectX InfiniBand adapters') Signed-off-by:
Matan Barak <matanb@mellanox.com> Signed-off-by:
Daniel Jurgens <danielj@mellanox.com> Reviewed-by:
Mark Bloch <markb@mellanox.com> Signed-off-by:
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Daniel Jurgens authored
Check the returned GID index value and return an error if it is invalid. Fixes: 5070cd22 ('IB/mlx4: Replace mechanism for RoCE GID management') Signed-off-by:
Yuval Shaia <yuval.shaia@oracle.com> Signed-off-by:
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Eli Cohen authored
For XRC QP CQs may not exist. Check before attempting dereference. Fixes: e126ba97 ('mlx5: Add driver for Mellanox Connect-IB adapters') Signed-off-by:
Eli Cohen <eli@mellanox.com> Signed-off-by:
Maor Gottlieb <maorg@mellanox.com> Reviewed-by:
Yishai Hadas <yishaih@mellanox.com> Signed-off-by:
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Eli Cohen authored
When an internal error condition is detected, make sure to set the device inactive after dispatching the event so ULPs can get a notification of this event. Fixes: e126ba97 ('mlx5: Add driver for Mellanox Connect-IB adapters') Signed-off-by:
Mohamad Haj Yahia <mohamad@mellanox.com> Signed-off-by:
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Moshe Lazer authored
When calling reg_mr of large MRs (e.g. 4GB) from multiple processes and MR caches can't supply the required amount of MRs the slow-path of MR allocation may be used. In this case we need to serialize the slow-path between the processes to avoid soft lock. Fixes: e126ba97 ('mlx5: Add driver for Mellanox Connect-IB adapters') Signed-off-by:
Moshe Lazer <moshel@mellanox.com> Signed-off-by:
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Daniel Jurgens authored
When creating kernel CQs use 128B CQE stride if the cache line size is 128B, 64B otherwise. This prevents multiple CQEs from residing in a 128B cache line, which can cause retries when there are concurrent read and writes in one cache line. Tested with IPoIB on PPC64, saw ~5% throughput improvement. Fixes: e126ba97 ('mlx5: Add driver for Mellanox Connect-IB adapters') Signed-off-by:
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Maor Gottlieb authored
Validate that the requested size of RQT is supported by firmware. Fixes: c5f90929 ('IB/mlx5: Add Receive Work Queue Indirection table operations') Signed-off-by:
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Majd Dibbiny authored
We need to free dev->port when we fail to enable RoCE or initialize node data. Fixes: 0837e86a ('IB/mlx5: Add per port counters') Signed-off-by:
Majd Dibbiny <majd@mellanox.com> Signed-off-by:
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Mark Bloch authored
sg_alloc_table gets unsigned int as parameter while the driver returns it as size_t. Check npages isn't greater than maximum unsigned int. Fixes: eeb8461e ("IB: Refactor umem to use linear SG table") Signed-off-by:
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Mark Bloch authored
When calling rdma_resolve_ip inside rdma_addr_find_l2_eth_by_grh, the return status of the request was ignored in the callback function causing a successful return and an empty dmac. Signed-off-by:
Alex Vesker <valex@mellanox.com> Reviewed-by:
Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by:
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Leon Romanovsky authored
On Thu, Oct 27, 2016 at 04:36:28PM +0300, Leon Romanovsky wrote: > From: Mark Bloch <markb@mellanox.com> > > If the underlying netowrk type is ipv4 or ipv6 and the device supports > routable RoCE, prefer it so the traffic could cross subnets. > > Signed-off-by: Mark Bloch <markb@mellanox.com> > Signed-off-by: Maor Gottlieb <maorg@mellanox.com> > Signed-off-by: Leon Romanovsky <leon@kernel.org> > --- Hi Doug, Please take the following v1 of this patch where I fixed spelling error from "netowrk" to be "network". Thanks. >From 09f96ba3e9b4442cfb44dca04c6726e55525c9c3 Mon Sep 17 00:00:00 2001 From: Mark Bloch <markb@mellanox.com> Date: Sun, 11 Sep 2016 06:25:10 +0000 Subject: [PATCH rdma-rc v1 3/6] IB/core: Set routable RoCE gid type for ipv4/ipv6 networks If the underlying network type is ipv4 or ipv6 and the device supports routable RoCE, prefer it so the traffic could cross subnets. Signed-off-by:
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Mark Bloch authored
When there is a CM id object that has port assigned to it, it means that the cm-id asked for the specific port that it should go by it, but if that port was removed (hot-unplug event) the cm-id was not updated. In order to fix that the port keeps a list of all the cm-id's that are planning to go by it, whenever the port is removed it marks all of them as invalid. This commit fixes a kernel panic which happens when running traffic between guests and we force reboot a guest mid traffic, it triggers a kernel panic: Call Trace: [<ffffffff815271fa>] ? panic+0xa7/0x16f [<ffffffff8152b534>] ? oops_end+0xe4/0x100 [<ffffffff8104a00b>] ? no_context+0xfb/0x260 [<ffffffff81084db2>] ? del_timer_sync+0x22/0x30 [<ffffffff8104a295>] ? __bad_area_nosemaphore+0x125/0x1e0 [<ffffffff81084240>] ? process_timeout+0x0/0x10 [<ffffffff8104a363>] ? bad_area_nosemaphore+0x13/0x20 [<ffffffff8104aabf>] ? __do_page_fault+0x31f/0x480 [<ffffffff81065df0>] ? default_wake_function+0x0/0x20 [<ffffffffa0752675>] ? free_msg+0x55/0x70 [mlx5_core] [<ffffffffa0753434>] ? cmd_exec+0x124/0x840 [mlx5_core] [<ffffffff8105a924>] ? find_busiest_group+0x244/0x9f0 [<ffffffff8152d45e>] ? do_page_fault+0x3e/0xa0 [<ffffffff8152a815>] ? page_fault+0x25/0x30 [<ffffffffa024da25>] ? cm_alloc_msg+0x35/0xc0 [ib_cm] [<ffffffffa024e821>] ? ib_send_cm_dreq+0xb1/0x1e0 [ib_cm] [<ffffffffa024f836>] ? cm_destroy_id+0x176/0x320 [ib_cm] [<ffffffffa024fb00>] ? ib_destroy_cm_id+0x10/0x20 [ib_cm] [<ffffffffa034f527>] ? ipoib_cm_free_rx_reap_list+0xa7/0x110 [ib_ipoib] [<ffffffffa034f590>] ? ipoib_cm_rx_reap+0x0/0x20 [ib_ipoib] [<ffffffffa034f5a5>] ? ipoib_cm_rx_reap+0x15/0x20 [ib_ipoib] [<ffffffff81094d20>] ? worker_thread+0x170/0x2a0 [<ffffffff8109b2a0>] ? autoremove_wake_function+0x0/0x40 [<ffffffff81094bb0>] ? worker_thread+0x0/0x2a0 [<ffffffff8109aef6>] ? kthread+0x96/0xa0 [<ffffffff8100c20a>] ? child_rip+0xa/0x20 [<ffffffff8109ae60>] ? kthread+0x0/0xa0 [<ffffffff8100c200>] ? child_rip+0x0/0x20 Fixes: a977049d ("[PATCH] IB: Add the kernel CM implementation") Signed-off-by:
Erez Shitrit <erezsh@mellanox.com> Reviewed-by:
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Tariq Toukan authored
The real QP is destroyed in case of the ref count reaches zero, but for XRC target QPs this call was missed and caused to QP leaks. Let's call to destroy for all flows. Fixes: 0e0ec7e0 ('RDMA/core: Export ib_open_qp() to share XRC...') Signed-off-by:
Tariq Toukan <tariqt@mellanox.com> Signed-off-by:
Noa Osherovich <noaos@mellanox.com> Signed-off-by:
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- 15 Nov, 2016 15 commits
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Dennis Dalessandro authored
Remove IS_ERR check from caching code as the function being called does not actually return error pointers. Fixes: f19bd643: "IB/hfi1: Prevent NULL pointer deferences in caching code" Reported-by:
Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by:
Dean Luick <dean.luick@intel.com> Signed-off-by:
Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by:
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Jianxin Xiong authored
Increase the size of the buffer that is used to construct per-VL and per-SDMA counter names. Reviewed-by:
Jianxin Xiong <jianxin.xiong@intel.com> Signed-off-by:
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Dasaratharaman Chandramouli authored
When processing ECN via the prescan_rxq path, some fields in the packet structure are passed uninitialized. This can potentially cause NULL pointer exceptions during ECN handling. Reviewed-by:
Ira Weiny <ira.weiny@intel.com> Reviewed-by:
Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com> Signed-off-by:
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Jakub Pawlak authored
Set the status code BAD_L2 when unsupported type of packet is received and dropped. Reviewed-by:
Jakub Pawlak <jakub.pawlak@intel.com> Signed-off-by:
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Krzysztof Blaszkowski authored
Validate the rcvhdrcnt module parameter in a single function at module load time. This allows proper error reporting. Reviewed-by:
Krzysztof Blaszkowski <krzysztof.blaszkowski@intel.com> Signed-off-by:
Tymoteusz Kielan <tymoteusz.kielan@intel.com> Signed-off-by:
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Ira Weiny authored
The new s_rnr_timeout was not properly being set and the code was incorrectly setting a different timer. Found by code inspection. Cc: <stable@vger.kernel.org> # 4.7.x Fixes: 08279d5c ("staging/rdma/hfi1: use new RNR timer") Reviewed-by:
Mike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by:
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Easwar Hariharan authored
The lock is an unused vestige from qib. Remove it. Reviewed-by:
Easwar Hariharan <easwar.hariharan@intel.com> Signed-off-by:
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Easwar Hariharan authored
hfi1_pcie_ddinit takes the PCI device id as an argument but never uses it. Clean it up. Reviewed-by:
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Dennis Dalessandro authored
A few snoop related variables were missed in the snoop/capture removal to get out of staging. Go back and clean those up too. Reviewed-by:
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Jianxin Xiong authored
In the function hfi1_create_ctxts the array "dd->rcd" is allocated and then populated with allocated resources in a loop. Previously, if error happened during the loop, only resource allocated in the current iteration would be freed. The array itself would then be freed, leaving the resources that were allocated in previous iterations and referenced by the array elements in limbo. This patch makes sure all allocated resources are freed before freeing the array "dd->rcd". Also the resource allocation now takes account of the numa node the device is attached to. Reviewed-by:
Tadeusz Struk <tadeusz.struk@intel.com> Signed-off-by:
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Krzysztof Blaszkowski authored
Clean up device type checking. Reviewed-by:
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Tadeusz Struk authored
This patch fixes an Oops on device unbind, when the device is used by a PSM user process. PSM processes access device resources which are freed on device removal. Similar protection exists in uverbs in ib_core for Verbs clients, but PSM doesn't use ib_uverbs hence a separate protection is required for PSM clients. Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Reviewed-by:
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Jakub Pawlak authored
Prevent setting up integrity check flags when module is loaded with NO_INTEGRITY capability. Reviewed-by:
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Tadeusz Struk authored
The IRQ affinity entry is not needed after the irq notifier patch has been added to the hfi1 driver. The irq affinity settings for SDMA engine should be set using the standard /proc/irq/<N>/ interface. Reviewed-by:
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Dennis Dalessandro authored
The initial code for rdmavt carried with it a restriction that was a vestige from the qib driver, that to dma map a page it had to be less than a page size. This is not the case on modern hardware, both qib and hfi1 will be just fine with unaligned map requests. This fixes a 4.8 regression where by an IPoIB transfer of > PAGE_SIZE will hang because the dma map page call always fails. This was introduced after commit 5faba546 ("IB/ipoib: Report SG feature regardless of HW UD CSUM capability") added the capability to use SG by default. Rather than override this, the HW supports it, so allow SG. Cc: Stable <stable@vger.kernel.org> # 4.8 Reviewed-by:
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- 29 Oct, 2016 5 commits
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Linus Torvalds authored
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 bugfix from Thomas Gleixner: "A single bugfix for the recent changes related to registering the boot cpu when this has not happened before prefill_possible_map(). The main problem with this change got fixed already, but we missed the case where the local APIC is not yet mapped, when prefill_possible_map() is invoked, so the registration of the boot cpu which has the APIC bit set in CPUID will explode. I should have seen that issue earlier, but all I can do now is feeling embarassed" * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/smpboot: Init apic mapping before usage
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git://git.infradead.org/linux-ubifsLinus Torvalds authored
Pull ubi/ubifs fixes from Richard Weinberger: "This contains fixes for issues in both UBI and UBIFS: - A regression wrt overlayfs, introduced in -rc2. - An UBI issue, found by Dan Carpenter's static checker" * tag 'upstream-4.9-rc3' of git://git.infradead.org/linux-ubifs: ubifs: Fix regression in ubifs_readdir() ubi: fastmap: Fix add_vol() return value test in ubi_attach_fastmap()
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git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-socLinus Torvalds authored
Pull ARM SoC fixes from Olof Johansson: "We haven't seen a whole lot of fixes for the first two weeks since the merge window, but here is the batch that we have at the moment. Nothing sticks out as particularly bad or scary, it's mostly a handful of smaller fixes to several platforms. The Uniphier reset controller changes could probably have been delayed to 4.10, but they're not scary and just plumbing up driver changes that went in during the merge window. We're also adding another maintainer to Marvell Berlin platforms, to help out when Sebastian is too busy. Yay teamwork!" * tag 'armsoc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: ARM: imx: mach-imx6q: Fix the PHY ID mask for AR8031 ARM: dts: vf610: fix IRQ flag of global timer ARM: imx: gpc: Fix the imx_gpc_genpd_init() error path ARM: imx: gpc: Initialize all power domains arm64: dts: Updated NAND DT properties for NS2 SVK arm64: dts: uniphier: change MIO node to SD control node ARM: dts: uniphier: change MIO node to SD control node reset: uniphier: rename MIO reset to SD reset for Pro5, PXs2, LD20 SoCs arm64: uniphier: select ARCH_HAS_RESET_CONTROLLER ARM: uniphier: select ARCH_HAS_RESET_CONTROLLER arm64: dts: Add timer erratum property for LS2080A and LS1043A arm64: dts: rockchip: remove the abuse of keep-power-in-suspend ARM: multi_v7_defconfig: Enable Intel e1000e driver MAINTAINERS: add myself as Marvell berlin SoC maintainer bus: qcom-ebi2: depend on ARCH_QCOM or COMPILE_TEST ARM: dts: fix the SD card on the Snowball arm64: dts: rockchip: remove always-on and boot-on from vcc_sd arm64: dts: marvell: fix clocksource for CP110 master SPI0 ARM: mvebu: Select corediv clk for all mvebu v7 SoC
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-miscLinus Torvalds authored
Pull char/misc driver fixes from Greg KH: "Here are a few small char/misc driver fixes for reported issues. The "biggest" are two binder fixes for reported issues that have been shipping in Android phones for a while now, the others are various fixes for reported problems. And there's a MAINTAINERS update for good measure. All have been in linux-next with no reported issues" * tag 'char-misc-4.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: MAINTAINERS: Add entry for genwqe driver VMCI: Doorbell create and destroy fixes GenWQE: Fix bad page access during abort of resource allocation vme: vme_get_size potentially returning incorrect value on failure extcon: qcom-spmi-misc: Sync the extcon state on interrupt hv: do not lose pending heartbeat vmbus packets mei: txe: don't clean an unprocessed interrupt cause. ANDROID: binder: Clear binder and cookie when setting handle in flat binder struct ANDROID: binder: Add strong ref checks
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