The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.19.y git checkout FETCH_HEAD git cherry-pick -x f2655ac2c06a15558e51ed6529de280e1553c86e # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024081141-tipoff-hurling-f5c9@gregkh' --subject-prefix 'PATCH 4.19.y' HEAD^..
Possible dependencies:
f2655ac2c06a ("clocksource: Fix brown-bag boolean thinko in cs_watchdog_read()") 2ed08e4bc532 ("clocksource: Scale the watchdog read retries automatically") 877a0e83c57f ("torture: Enable clocksource watchdog with "tsc=watchdog"") 1a5620671a1b ("clocksource: Reduce the default clocksource_watchdog() retries to 2") c86ff8c55b8a ("clocksource: Avoid accidental unstable marking of clocksources") ef4dac7dbde7 ("torture: Add clocksource-watchdog testing to torture.sh") 1253b9b87e42 ("clocksource: Provide kernel module to test clocksource watchdog") 2e27e793e280 ("clocksource: Reduce clocksource-skew threshold") fa218f1cce6b ("clocksource: Limit number of CPUs checked for clock synchronization") 7560c02bdffb ("clocksource: Check per-CPU clock synchronization when marked unstable") db3a34e17433 ("clocksource: Retry clock read if long delays detected") a115a775a8d5 ("torture: Add "make allmodconfig" to torture.sh") 197220d4a334 ("torture: Remove use of "eval" in torture.sh") 1adb5d6b5225 ("torture: Make torture.sh use common time-duration bash functions") bfc19c13d24c ("torture: Add torture.sh torture-everything script") 0a4bb5e5507a ("x86/fpu: Allow multiple bits in clearcpuid= parameter") 4185b3b92792 ("selftests/fpu: Add an FPU selftest") b2ef9f5a5cb3 ("mm/hmm/test: add selftest driver for HMM") 30428ef5d1e8 ("lib/test_lockup: test module to generate lockups") b95a8a27c300 ("x86/vdso: Use generic VDSO clock mode storage")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From f2655ac2c06a15558e51ed6529de280e1553c86e Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" paulmck@kernel.org Date: Fri, 2 Aug 2024 08:46:15 -0700 Subject: [PATCH] clocksource: Fix brown-bag boolean thinko in cs_watchdog_read()
The current "nretries > 1 || nretries >= max_retries" check in cs_watchdog_read() will always evaluate to true, and thus pr_warn(), if nretries is greater than 1. The intent is instead to never warn on the first try, but otherwise warn if the successful retry was the last retry.
Therefore, change that "||" to "&&".
Fixes: db3a34e17433 ("clocksource: Retry clock read if long delays detected") Reported-by: Borislav Petkov bp@alien8.de Signed-off-by: Paul E. McKenney paulmck@kernel.org Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: stable@vger.kernel.org Link: https://lore.kernel.org/all/20240802154618.4149953-2-paulmck@kernel.org
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c index d25ba49e313c..d0538a75f4c6 100644 --- a/kernel/time/clocksource.c +++ b/kernel/time/clocksource.c @@ -246,7 +246,7 @@ static enum wd_read_status cs_watchdog_read(struct clocksource *cs, u64 *csnow,
wd_delay = cycles_to_nsec_safe(watchdog, *wdnow, wd_end); if (wd_delay <= WATCHDOG_MAX_SKEW) { - if (nretries > 1 || nretries >= max_retries) { + if (nretries > 1 && nretries >= max_retries) { pr_warn("timekeeping watchdog on CPU%d: %s retried %d times before success\n", smp_processor_id(), watchdog->name, nretries); }