John Stultz 09f7ebaa43 time: Fix CLOCK_MONOTONIC_RAW sub-nanosecond accounting ... commit 3d88d56c58 upstream. Due to how the MONOTONIC_RAW accumulation logic was handled, there is the potential for a 1ns discontinuity when we do accumulations. This small discontinuity has for the most part gone un-noticed, but since ARM64 enabled CLOCK_MONOTONIC_RAW in their vDSO clock_gettime implementation, we've seen failures with the inconsistency-check test in kselftest. This patch addresses the issue by using the same sub-ns accumulation handling that CLOCK_MONOTONIC uses, which avoids the issue for in-kernel users. Since the ARM64 vDSO implementation has its own clock_gettime calculation logic, this patch reduces the frequency of errors, but failures are still seen. The ARM64 vDSO will need to be updated to include the sub-nanosecond xtime_nsec values in its calculation for this issue to be completely fixed. Signed-off-by: John Stultz <john.stultz@linaro.org> Tested-by: Daniel Mentz <danielmentz@google.com> Cc: Prarit Bhargava <prarit@redhat.com> Cc: Kevin Brodsky <kevin.brodsky@arm.com> Cc: Richard Cochran <richardcochran@gmail.com> Cc: Stephen Boyd <stephen.boyd@linaro.org> Cc: Will Deacon <will.deacon@arm.com> Cc: "stable #4 . 8+" <stable@vger.kernel.org> Cc: Miroslav Lichvar <mlichvar@redhat.com> Link: http://lkml.kernel.org/r/1496965462-20003-3-git-send-email-john.stultz@linaro.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de> [fabrizio: cherry-pick to 4.4. Kept cycle_t type for function logarithmic_accumulation local variable "interval". Dropped casting of "interval" variable] Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com> Signed-off-by: Biju Das <biju.das@bp.renesas.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2018-05-26 08:49:00 +02:00
..
acpi
asm-generic	futex: Remove duplicated code and fix undefined behaviour	2018-05-26 08:48:50 +02:00
clocksource
crypto	crypto: poly1305 - remove ->setkey() method	2018-02-16 20:09:43 +01:00
drm	drm: Allow determining if current task is output poll worker	2018-03-18 11:17:48 +01:00
dt-bindings	ARM: dts: Fix omap3 off mode pull defines	2017-11-21 09:21:19 +01:00
keys
kvm	KVM: arm/arm64: arch_timer: Preserve physical dist. active state on LR.active	2015-11-24 18:07:40 +01:00
linux	time: Fix CLOCK_MONOTONIC_RAW sub-nanosecond accounting	2018-05-26 08:49:00 +02:00
math-emu
media	videobuf2-core: Check user space planes array in dqbuf	2016-05-04 14:48:50 -07:00
memory
misc
net	soreuseport: initialise timewait reuseport field	2018-05-16 10:06:50 +02:00
pcmcia
ras
rdma	RDMA/ucma: Introduce safer rdma_addr_size() variants	2018-04-08 11:51:59 +02:00
rxrpc
scsi	scsi: sg: disable SET_FORCE_LOW_DMA	2018-01-23 19:50:14 +01:00
soc	ARM: at91: define LPDDR types	2017-03-12 06:37:24 +01:00
sound	ALSA: control: Hardening for potential Spectre v1	2018-05-02 07:53:41 -07:00
target	target: Avoid early CMD_T_PRE_EXECUTE failures during ABORT_TASK	2018-01-17 09:35:31 +01:00
trace	tracing/x86/xen: Remove zero data size trace events trace_xen_mmu_flush_tlb{_all}	2018-05-26 08:48:54 +02:00
uapi	KVM: s390: wire up bpb feature	2018-04-29 07:50:02 +02:00
video	drm/imx: Match imx-ipuv3-crtc components using device node in platform data	2016-06-07 18:14:37 -07:00
xen	fix xen_swiotlb_dma_mmap prototype	2017-10-05 09:41:48 +02:00
Kbuild