linux-stable/arch
Paul E. McKenney 7560c02bdf clocksource: Check per-CPU clock synchronization when marked unstable
Some sorts of per-CPU clock sources have a history of going out of
synchronization with each other.  However, this problem has purportedy been
solved in the past ten years.  Except that it is all too possible that the
problem has instead simply been made less likely, which might mean that
some of the occasional "Marking clocksource 'tsc' as unstable" messages
might be due to desynchronization.  How would anyone know?

Therefore apply CPU-to-CPU synchronization checking to newly unstable
clocksource that are marked with the new CLOCK_SOURCE_VERIFY_PERCPU flag.
Lists of desynchronized CPUs are printed, with the caveat that if it
is the reporting CPU that is itself desynchronized, it will appear that
all the other clocks are wrong.  Just like in real life.

Reported-by: Chris Mason <clm@fb.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Feng Tang <feng.tang@intel.com>
Link: https://lore.kernel.org/r/20210527190124.440372-2-paulmck@kernel.org
2021-06-22 16:53:16 +02:00
..
alpha quota: Disable quotactl_path syscall 2021-05-17 14:39:56 +02:00
arc ARC: mm: Use max_high_pfn as a HIGHMEM zone border 2021-05-10 12:38:59 -07:00
arm arm: zynq: don't disable CONFIG_ARM_GLOBAL_TIMER due to CONFIG_CPU_FREQ anymore 2021-06-16 17:33:04 +02:00
arm64 ARM fixes: 2021-05-29 06:02:25 -10:00
csky arch/csky patches for 5.13-rc1 2021-05-03 12:58:31 -07:00
h8300 arch: rearrange headers inclusion order in asm/bitops for m68k, sh and h8300 2021-05-06 19:24:11 -07:00
hexagon Merge branch 'akpm' (patches from Andrew) 2021-05-07 00:34:51 -07:00
ia64 quota: Disable quotactl_path syscall 2021-05-17 14:39:56 +02:00
m68k Merge branch 'for-v5.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2021-05-21 06:12:52 -10:00
microblaze quota: Disable quotactl_path syscall 2021-05-17 14:39:56 +02:00
mips - fixed function/preempt traces hangs 2021-05-28 08:24:13 -10:00
nds32 tracing updates for 5.13 2021-05-03 11:19:54 -07:00
nios2 Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2021-05-02 09:14:01 -07:00
openrisc OpenRISC fixes for 5.13 2021-05-21 06:06:19 -10:00
parisc quota: Disable quotactl_path syscall 2021-05-17 14:39:56 +02:00
powerpc Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2021-05-29 18:24:00 -10:00
riscv riscv: kexec: Fix W=1 build warnings 2021-05-22 22:05:30 -07:00
s390 quota: Disable quotactl_path syscall 2021-05-17 14:39:56 +02:00
sh \n 2021-05-20 06:20:15 -10:00
sparc quota: Disable quotactl_path syscall 2021-05-17 14:39:56 +02:00
um Merge branch 'akpm' (patches from Andrew) 2021-05-07 00:34:51 -07:00
x86 clocksource: Check per-CPU clock synchronization when marked unstable 2021-06-22 16:53:16 +02:00
xtensa quota: Disable quotactl_path syscall 2021-05-17 14:39:56 +02:00
.gitignore .gitignore: prefix local generated files with a slash 2021-05-02 00:43:35 +09:00
Kconfig Add Landlock, a new LSM from Mickaël Salaün <mic@linux.microsoft.com> 2021-05-01 18:50:44 -07:00