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Mike Marciniszyn b9e1cc3b95 IB/hfi1: Insure use of smp_processor_id() is preempt disabled 
commit b6d57e24ce upstream.

The following BUG has just surfaced with our 5.16 testing:

  BUG: using smp_processor_id() in preemptible [00000000] code: mpicheck/1581081
  caller is sdma_select_user_engine+0x72/0x210 [hfi1]
  CPU: 0 PID: 1581081 Comm: mpicheck Tainted: G S                5.16.0-rc1+ #1
  Hardware name: Intel Corporation S2600WT2R/S2600WT2R, BIOS SE5C610.86B.01.01.0016.033120161139 03/31/2016
  Call Trace:
   <TASK>
   dump_stack_lvl+0x33/0x42
   check_preemption_disabled+0xbf/0xe0
   sdma_select_user_engine+0x72/0x210 [hfi1]
   ? _raw_spin_unlock_irqrestore+0x1f/0x31
   ? hfi1_mmu_rb_insert+0x6b/0x200 [hfi1]
   hfi1_user_sdma_process_request+0xa02/0x1120 [hfi1]
   ? hfi1_write_iter+0xb8/0x200 [hfi1]
   hfi1_write_iter+0xb8/0x200 [hfi1]
   do_iter_readv_writev+0x163/0x1c0
   do_iter_write+0x80/0x1c0
   vfs_writev+0x88/0x1a0
   ? recalibrate_cpu_khz+0x10/0x10
   ? ktime_get+0x3e/0xa0
   ? __fget_files+0x66/0xa0
   do_writev+0x65/0x100
   do_syscall_64+0x3a/0x80

Fix this long standing bug by moving the smp_processor_id() to after the
rcu_read_lock().

The rcu_read_lock() implicitly disables preemption.

Link: https://lore.kernel.org/r/20211129191958.101968.87329.stgit@awfm-01.cornelisnetworks.com
Cc: stable@vger.kernel.org
Fixes: 0cb2aa690c ("IB/hfi1: Add sysfs interface for affinity setup")
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-12-14 10:57:06 +01:00
arch x86/64/mm: Map all kernel memory into trampoline_pgd 2021-12-08 09:04:56 +01:00
block block: avoid to quiesce queue in elevator_init_mq 2021-12-01 09:04:56 +01:00
certs certs: Add support for using elliptic curve keys for signing modules 2021-08-23 19:55:42 +03:00
crypto crypto: pcrypt - Delay write to padata->info 2021-11-18 19:16:44 +01:00
Documentation docs: accounting: update delay-accounting.rst reference 2021-12-01 09:04:56 +01:00
drivers IB/hfi1: Insure use of smp_processor_id() is preempt disabled 2021-12-14 10:57:06 +01:00
fs io-wq: don't retry task_work creation failure on fatal conditions 2021-12-08 09:04:53 +01:00
include HID: add hid_is_usb() function to make it simpler for USB detection 2021-12-14 10:57:05 +01:00
init init: make unknown command line param message clearer 2021-11-18 19:17:11 +01:00
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-11-25 09:48:42 +01:00
kernel sched/uclamp: Fix rq->uclamp_max not set on first enqueue 2021-12-08 09:04:54 +01:00
lib siphash: use _unaligned version by default 2021-12-08 09:04:47 +01:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm hugetlbfs: flush TLBs correctly after huge_pmd_unshare 2021-11-25 09:49:07 +01:00
net nft_set_pipapo: Fix bucket load in AVX2 lookup routine for six 8-bit groups 2021-12-14 10:57:06 +01:00
samples samples/bpf: Fix incorrect use of strlen in xdp_redirect_cpu 2021-11-25 09:48:33 +01:00
scripts leaking_addresses: Always print a trailing newline 2021-11-18 19:16:16 +01:00
security selinux: fix NULL-pointer dereference when hashtab allocation fails 2021-11-25 09:49:07 +01:00
sound ASoC: rk817: Add module alias for rk817-codec 2021-12-08 09:04:52 +01:00
tools selftests: net: Correct case name 2021-12-08 09:04:47 +01:00
usr .gitignore: prefix local generated files with a slash 2021-05-02 00:43:35 +09:00
virt KVM: Ensure local memslot copies operate on up-to-date arch-specific data 2021-12-08 09:04:43 +01:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS drm fixes for 5.15 final 2021-10-28 12:17:01 -07:00
Makefile Linux 5.15.7 2021-12-08 09:04:57 +01:00
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.