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Douglas Anderson fdb07728d8 watchdog/perf: more properly prevent false positives with turbo modes 
[ Upstream commit 4379e59fe5665cfda737e45b8bf2f05321ef049c ]

Currently, in the watchdog_overflow_callback() we first check to see if
the watchdog had been touched and _then_ we handle the workaround for
turbo mode.  This order should be reversed.

Specifically, "touching" the hardlockup detector's watchdog should avoid
lockups being detected for one period that should be roughly the same
regardless of whether we're running turbo or not.  That means that we
should do the extra accounting for turbo _before_ we look at (and clear)
the global indicating that we've been touched.

NOTE: this fix is made based on code inspection.  I am not aware of any
reports where the old code would have generated false positives.  That
being said, this order seems more correct and also makes it easier down
the line to share code with the "buddy" hardlockup detector.

Link: https://lkml.kernel.org/r/20230519101840.v5.2.I843b0d1de3e096ba111a179f3adb16d576bef5c7@changeid
Fixes: 7edaeb6841 ("kernel/watchdog: Prevent false positives with turbo modes")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chen-Yu Tsai <wens@csie.org>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Colin Cross <ccross@android.com>
Cc: Daniel Thompson <daniel.thompson@linaro.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Guenter Roeck <groeck@chromium.org>
Cc: Ian Rogers <irogers@google.com>
Cc: Lecopzer Chen <lecopzer.chen@mediatek.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masayoshi Mizuma <msys.mizuma@gmail.com>
Cc: Matthias Kaehlcke <mka@chromium.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Pingfan Liu <kernelfans@gmail.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: "Ravi V. Shankar" <ravi.v.shankar@intel.com>
Cc: Ricardo Neri <ricardo.neri@intel.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Stephen Boyd <swboyd@chromium.org>
Cc: Sumit Garg <sumit.garg@linaro.org>
Cc: Tzung-Bi Shih <tzungbi@chromium.org>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-07-27 08:43:40 +02:00
arch x86/mm: Fix __swp_entry_to_pte() for Xen PV guests 2023-07-27 08:43:35 +02:00
block blk-iocost: use spin_lock_irqsave in adjust_inuse_and_calc_cost 2023-07-27 08:43:32 +02:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-22 14:13:17 +02:00
crypto KEYS: asymmetric: Copy sig and digest in public_key_verify_signature() 2023-06-09 10:30:17 +02:00
Documentation mm/pagealloc: sysctl: change watermark_scale_factor max limit to 30% 2023-06-28 10:28:09 +02:00
drivers wifi: rsi: Do not set MMC_PM_KEEP_POWER in shutdown 2023-07-27 08:43:40 +02:00
fs pstore/ram: Add check for kstrdup 2023-07-27 08:43:36 +02:00
include watchdog/perf: define dummy watchdog_update_hrtimer_threshold() on correct config 2023-07-27 08:43:40 +02:00
init kbuild: check the minimum assembler version in Kconfig 2023-04-20 12:10:28 +02:00
io_uring io_uring/net: disable partial retries for recvmsg with cmsg 2023-06-28 10:28:09 +02:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:24:00 +01:00
kernel watchdog/perf: more properly prevent false positives with turbo modes 2023-07-27 08:43:40 +02:00
lib test_firmware: fix a memory leak with reqs buffer 2023-06-21 15:45:35 +02:00
LICENSES LICENSES/deprecated: add Zlib license text 2020-09-16 14:33:49 +02:00
mm memfd: check for non-NULL file_seals in memfd_create() syscall 2023-06-28 10:28:09 +02:00
net nfc: llcp: fix possible use of uninitialized variable in nfc_llcp_send_connect() 2023-07-27 08:43:37 +02:00
samples samples/bpf: Fix buffer overflow in tcp_basertt 2023-07-27 08:43:36 +02:00
scripts scripts/tags.sh: Resolve gtags empty index generation 2023-07-27 08:43:31 +02:00
security ima: Fix build warnings 2023-07-27 08:43:35 +02:00
sound ASoC: nau8824: Add quirk to active-high jack-detect 2023-06-28 10:28:15 +02:00
tools bpftool: JIT limited misreported as negative value on aarch64 2023-07-27 08:43:37 +02:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2022-02-01 17:25:48 +01:00
virt KVM: fix memoryleak in kvm_init() 2023-04-05 11:23:43 +02:00
.clang-format RDMA 5.10 pull request 2020-10-17 11:18:18 -07:00
.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 kbuild: generate Module.symvers only when vmlinux exists 2021-05-19 10:12:59 +02:00
.mailmap mailmap: add two more addresses of Uwe Kleine-König 2020-12-06 10:19:07 -08:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Jason Cooper to CREDITS 2020-11-30 10:20:34 +01:00
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 Remove DECnet support from kernel 2023-06-21 15:45:38 +02:00
Makefile Linux 5.10.187 2023-07-24 19:09:12 +02:00
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.