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Mike Marciniszyn 4c4b1996b5 IB/hfi1: Fix WQ_MEM_RECLAIM warning 
The work_item cancels that occur when a QP is destroyed can elicit the
following trace:

 workqueue: WQ_MEM_RECLAIM ipoib_wq:ipoib_cm_tx_reap [ib_ipoib] is flushing !WQ_MEM_RECLAIM hfi0_0:_hfi1_do_send [hfi1]
 WARNING: CPU: 7 PID: 1403 at kernel/workqueue.c:2486 check_flush_dependency+0xb1/0x100
 Call Trace:
  __flush_work.isra.29+0x8c/0x1a0
  ? __switch_to_asm+0x40/0x70
  __cancel_work_timer+0x103/0x190
  ? schedule+0x32/0x80
  iowait_cancel_work+0x15/0x30 [hfi1]
  rvt_reset_qp+0x1f8/0x3e0 [rdmavt]
  rvt_destroy_qp+0x65/0x1f0 [rdmavt]
  ? _cond_resched+0x15/0x30
  ib_destroy_qp+0xe9/0x230 [ib_core]
  ipoib_cm_tx_reap+0x21c/0x560 [ib_ipoib]
  process_one_work+0x171/0x370
  worker_thread+0x49/0x3f0
  kthread+0xf8/0x130
  ? max_active_store+0x80/0x80
  ? kthread_bind+0x10/0x10
  ret_from_fork+0x35/0x40

Since QP destruction frees memory, hfi1_wq should have the WQ_MEM_RECLAIM.

The hfi1_wq does not allocate memory with GFP_KERNEL or otherwise become
entangled with memory reclaim, so this flag is appropriate.

Fixes: 0a226edd20 ("staging/rdma/hfi1: Use parallel workqueue for SDMA engines")
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
2019-05-06 12:57:45 -03:00
arch powerpc fixes for 5.1 #5 2019-04-13 09:03:09 -07:00
block block: do not leak memory in bio_copy_user_iov() 2019-04-10 16:14:40 -06:00
certs kexec, KEYS: Make use of platform keyring for signature verify 2019-02-04 17:34:07 -05:00
crypto lib/lzo: separate lzo-rle from lzo 2019-03-07 18:32:03 -08:00
Documentation ARM: SoC fixes 2019-04-07 13:46:17 -10:00
drivers IB/hfi1: Fix WQ_MEM_RECLAIM warning 2019-05-06 12:57:45 -03:00
fs Merge branch 'page-refs' (page ref overflow) 2019-04-14 15:09:40 -07:00
include IB/mlx5: Add steering SW ICM device memory type 2019-05-06 12:51:51 -03:00
init init/main: add checks for the return value of memblock_alloc*() 2019-03-12 10:04:02 -07:00
ipc Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-03-12 14:08:19 -07:00
kernel Merge branch 'page-refs' (page ref overflow) 2019-04-14 15:09:40 -07:00
lib RDMA/core: Introduce RDMA subsystem ibdev_* print functions 2019-05-01 12:29:28 -04:00
LICENSES LICENSES: Add GCC runtime library exception text 2019-01-16 14:54:15 -07:00
mm Merge branch 'page-refs' (page ref overflow) 2019-04-14 15:09:40 -07:00
net net/smc: Use rdma_read_gid_l2_fields to L2 fields 2019-05-03 11:10:03 -03:00
samples BPF: Add sample code for new ib_umad tracepoint 2019-03-27 15:53:26 -03:00
scripts fs: stream_open - opener for stream-like files so that read and write can run simultaneously without deadlock 2019-04-06 07:01:55 -10:00
security apparmor: Restore Y/N in /sys for apparmor's "enabled" 2019-04-10 04:24:48 -07:00
sound ASoC: Fixes for v5.1 2019-04-11 14:36:30 +02:00
tools for-linus-20190412 2019-04-13 16:23:16 -07:00
usr user/Makefile: Fix typo and capitalization in comment section 2018-12-11 00:18:03 +09:00
virt KVM/ARM fixes for 5.1 2019-03-28 19:07:30 +01:00
.clang-format clang-format: Update with the latest for_each macro list 2019-04-12 12:49:54 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore kbuild: Add support for DT binding schema checks 2018-12-13 09:41:32 -06:00
.mailmap Update Nicolas Pitre's email address 2019-04-02 18:12:44 -10:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS Char/Misc driver patches for 5.1-rc1 2019-03-06 14:18:59 -08:00
Kbuild Kbuild updates for v5.1 2019-03-10 17:48:21 -07:00
Kconfig kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt 2018-08-02 08:06:55 +09:00
MAINTAINERS Merge branch 'rdma_mmap' into rdma.git for-next 2019-04-24 16:20:34 -03:00
Makefile Linux 5.1-rc5 2019-04-14 15:17:41 -07:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.