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John Stultz f9e761541e pstore: Switch pmsg_lock to an rt_mutex to avoid priority inversion 
[ Upstream commit 76d62f24db ]

Wei Wang reported seeing priority inversion caused latencies
caused by contention on pmsg_lock, and suggested it be switched
to a rt_mutex.

I was initially hesitant this would help, as the tasks in that
trace all seemed to be SCHED_NORMAL, so the benefit would be
limited to only nice boosting.

However, another similar issue was raised where the priority
inversion was seen did involve a blocked RT task so it is clear
this would be helpful in that case.

Cc: Wei Wang <wvw@google.com>
Cc: Midas Chien<midaschieh@google.com>
Cc: Connor O'Brien <connoro@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Anton Vorontsov <anton@enomsg.org>
Cc: Colin Cross <ccross@android.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: kernel-team@android.com
Fixes: 9d5438f462 ("pstore: Add pmsg - user-space accessible pstore object")
Reported-by: Wei Wang <wvw@google.com>
Signed-off-by: John Stultz <jstultz@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20221214231834.3711880-1-jstultz@google.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-01-18 11:30:38 +01:00
arch powerpc/hv-gpci: Fix hv_gpci event list 2023-01-18 11:30:31 +01:00
block blk-mq: fix possible memleak when register 'hctx' failed 2023-01-18 11:30:37 +01:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-25 11:49:16 +02:00
crypto crypto: tcrypt - Fix multibuffer skcipher speed test mem leak 2023-01-18 11:30:22 +01:00
Documentation spi: Update reference to struct spi_controller 2023-01-18 11:30:10 +01:00
drivers drm/sti: Fix return type of sti_{dvo,hda,hdmi}_connector_mode_valid() 2023-01-18 11:30:37 +01:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:21:29 +01:00
fs pstore: Switch pmsg_lock to an rt_mutex to avoid priority inversion 2023-01-18 11:30:38 +01:00
include media: dvbdev: adopts refcnt to avoid UAF 2023-01-18 11:30:36 +01:00
init random: handle latent entropy and command line from random_init() 2022-06-25 11:49:11 +02:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:18:35 +01:00
kernel acct: fix potential integer overflow in encode_comp_t() 2023-01-18 11:30:34 +01:00
lib test_firmware: fix memory leak in test_firmware_init() 2023-01-18 11:30:26 +01:00
LICENSES LICENSES: Remove CC-BY-SA-4.0 license text 2018-10-18 11:28:50 +02:00
mm mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths 2023-01-18 11:29:59 +01:00
net mrp: introduce active flags to prevent UAF when applicant uninit 2023-01-18 11:30:36 +01:00
samples samples: vfio-mdev: Fix missing pci_disable_device() in mdpy_fb_probe() 2023-01-18 11:30:28 +01:00
scripts scripts/faddr2line: Fix regression in name resolution on ppc64le 2022-12-08 11:18:32 +01:00
security apparmor: Fix abi check to include v8 abi 2023-01-18 11:30:21 +01:00
sound ASoC: rt5670: Remove unbalanced pm_runtime_put() 2023-01-18 11:30:38 +01:00
tools selftests/powerpc: Fix resource leaks 2023-01-18 11:30:31 +01:00
usr initramfs: restore default compression behavior 2020-04-13 10:44:59 +02:00
virt KVM: arm64: vgic: Fix exit condition in scan_its_table() 2022-11-03 23:52:24 +09:00
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MAINTAINERS MAINTAINERS: co-maintain random.c 2022-06-25 11:49:01 +02:00
Makefile Linux 4.19.269 2022-12-14 11:28:31 +01:00
README

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.
See Documentation/00-INDEX for a list of what is contained in each file.

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.