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Shiraz Saleem f2c3037811 RDMA/irdma: Fix data race on CQP completion stats 
CQP completion statistics is read lockesly in irdma_wait_event and
irdma_check_cqp_progress while it can be updated in the completion
thread irdma_sc_ccq_get_cqe_info on another CPU as KCSAN reports.

Make completion statistics an atomic variable to reflect coherent updates
to it. This will also avoid load/store tearing logic bug potentially
possible by compiler optimizations.

[77346.170861] BUG: KCSAN: data-race in irdma_handle_cqp_op [irdma] / irdma_sc_ccq_get_cqe_info [irdma]

[77346.171383] write to 0xffff8a3250b108e0 of 8 bytes by task 9544 on cpu 4:
[77346.171483]  irdma_sc_ccq_get_cqe_info+0x27a/0x370 [irdma]
[77346.171658]  irdma_cqp_ce_handler+0x164/0x270 [irdma]
[77346.171835]  cqp_compl_worker+0x1b/0x20 [irdma]
[77346.172009]  process_one_work+0x4d1/0xa40
[77346.172024]  worker_thread+0x319/0x700
[77346.172037]  kthread+0x180/0x1b0
[77346.172054]  ret_from_fork+0x22/0x30

[77346.172136] read to 0xffff8a3250b108e0 of 8 bytes by task 9838 on cpu 2:
[77346.172234]  irdma_handle_cqp_op+0xf4/0x4b0 [irdma]
[77346.172413]  irdma_cqp_aeq_cmd+0x75/0xa0 [irdma]
[77346.172592]  irdma_create_aeq+0x390/0x45a [irdma]
[77346.172769]  irdma_rt_init_hw.cold+0x212/0x85d [irdma]
[77346.172944]  irdma_probe+0x54f/0x620 [irdma]
[77346.173122]  auxiliary_bus_probe+0x66/0xa0
[77346.173137]  really_probe+0x140/0x540
[77346.173154]  __driver_probe_device+0xc7/0x220
[77346.173173]  driver_probe_device+0x5f/0x140
[77346.173190]  __driver_attach+0xf0/0x2c0
[77346.173208]  bus_for_each_dev+0xa8/0xf0
[77346.173225]  driver_attach+0x29/0x30
[77346.173240]  bus_add_driver+0x29c/0x2f0
[77346.173255]  driver_register+0x10f/0x1a0
[77346.173272]  __auxiliary_driver_register+0xbc/0x140
[77346.173287]  irdma_init_module+0x55/0x1000 [irdma]
[77346.173460]  do_one_initcall+0x7d/0x410
[77346.173475]  do_init_module+0x81/0x2c0
[77346.173491]  load_module+0x1232/0x12c0
[77346.173506]  __do_sys_finit_module+0x101/0x180
[77346.173522]  __x64_sys_finit_module+0x3c/0x50
[77346.173538]  do_syscall_64+0x39/0x90
[77346.173553]  entry_SYSCALL_64_after_hwframe+0x63/0xcd

[77346.173634] value changed: 0x0000000000000094 -> 0x0000000000000095

Fixes: 915cc7ac0f ("RDMA/irdma: Add miscellaneous utility definitions")
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Link: https://lore.kernel.org/r/20230711175253.1289-3-shiraz.saleem@intel.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
2023-07-17 08:01:46 +03:00
arch - Do FPU AP initialization on Xen PV too which got missed by the recent 2023-07-09 10:13:32 -07:00
block block-6.5-2023-07-03 2023-07-03 18:48:38 -07:00
certs KEYS: Add missing function documentation 2023-04-24 16:15:52 +03:00
crypto This update includes the following changes: 2023-06-30 21:27:13 -07:00
Documentation Fixes for pci_clean_master, error handling in driver inits, and various 2023-07-09 09:35:51 -07:00
drivers RDMA/irdma: Fix data race on CQP completion stats 2023-07-17 08:01:46 +03:00
fs Minor cleanups for 6.5: 2023-07-09 09:50:42 -07:00
include 16 hotfixes. Six are cc:stable and the remainder address post-6.4 issues. 2023-07-08 14:30:25 -07:00
init Kbuild updates for v6.5 2023-07-01 09:24:31 -07:00
io_uring io_uring-6.5-2023-07-03 2023-07-03 18:43:10 -07:00
ipc Merge branch 'work.namespace' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2023-02-24 19:20:07 -08:00
kernel dma-mapping fixes for Linux 6.5 2023-07-09 10:24:22 -07:00
lib 16 hotfixes. Six are cc:stable and the remainder address post-6.4 issues. 2023-07-08 14:30:25 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm: lock newly mapped VMA with corrected ordering 2023-07-08 16:44:11 -07:00
net Including fixes from bluetooth, bpf and wireguard. 2023-07-05 15:44:45 -07:00
rust rust: error: impl Debug for Error with errname() integration 2023-06-13 01:24:42 +02:00
samples Including fixes from bluetooth, bpf and wireguard. 2023-07-05 15:44:45 -07:00
scripts A half-dozen late arriving docs patches. They are mostly fixes, but we 2023-07-06 22:15:38 -07:00
security + Bug Fixes 2023-07-07 09:55:31 -07:00
sound sound fixes for 6.5-rc1 2023-07-07 15:40:17 -07:00
tools perf tools changes and fixes for v6.5: 2nd batch 2023-07-08 10:21:51 -07:00
usr initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP 2023-06-06 17:54:49 +09:00
virt ARM64: 2023-07-03 15:32:22 -07:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore Revert ".gitignore: ignore *.cover and *.mbx" 2023-07-04 15:05:12 -07:00
.mailmap 16 hotfixes. Six are cc:stable and the remainder address post-6.4 issues. 2023-07-08 14:30:25 -07:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS - Address -Wmissing-prototype warnings 2023-06-26 16:43:54 -07:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS 2: Electric Boogaloo 2023-07-09 10:29:53 -07:00
Makefile Linux 6.5-rc1 2023-07-09 13:53:13 -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.