Hi Vincenzo, On 6/28/19 16:32, Vincenzo Frascino wrote: > On 6/28/19 2:09 PM, Marek Szyprowski wrote: >> On 2019-06-21 11:52, Vincenzo Frascino wrote: >>> To take advantage of the commonly defined vdso interface for >>> gettimeofday the architectural code requires an adaptation. >>> >>> Re-implement the gettimeofday vdso in C in order to use lib/vdso. >>> >>> With the new implementation arm64 gains support for CLOCK_BOOTTIME >>> and CLOCK_TAI. >>> >>> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> >>> Cc: Will Deacon <will.deacon@xxxxxxx> >>> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx> >>> Tested-by: Shijith Thotton <sthotton@xxxxxxxxxxx> >>> Tested-by: Andre Przywara <andre.przywara@xxxxxxx> >>> Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx> >> >> This patch causes serious regression on Samsung Exynos5433 SoC based >> TM2(e) boards. The time in userspace is always set to begin of the epoch: >> >> # date 062813152019 >> Fri Jun 28 13:15:00 UTC 2019 >> # date >> Thu Jan 1 00:00:00 UTC 1970 >> # date >> Thu Jan 1 00:00:00 UTC 1970 >> >> I've noticed that since the patch landed in Linux next-20190625 and >> bisect indeed pointed to this patch. >> > Thank you for reporting this, seems that the next that you posted is missing > some fixes for arm64. > > Could you please try the tree below? > > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/vdso > > Let us know if the functionality is restored. Otherwise the issue will require > further investigation. Marek is already out for holidays, I gave your tree a try but kernel from that branch was failing to boot on TM2(e). Then I have cherry-picked 5 patches from the branch that seemed to be missing in next-20190628: 28028f3174cf1 (HEAD) MAINTAINERS: Fix Andy's surname and the directory entries of VDSO ec8f8e4bf2206 arm64: vdso: Fix compilation with clang older than 8 721882ebb5729 arm64: compat: Fix __arch_get_hw_counter() implementation 7027fea977a3d arm64: Fix __arch_get_hw_counter() implementation 10b305853fe22 lib/vdso: Make delta calculation work correctly 48568d8c7f479 (tag: next-20190628, linux-next/master) Add linux-next specific files for 20190628 With those 5 additional patches on top of next-20190628 the problem is not observed any more. date, ping, etc. seems to be working well. # date Fri Jun 28 16:39:22 UTC 2019 # # systemctl stop systemd-timesyncd # # date 062818392019 Fri Jun 28 18:39:00 UTC 2019 # date Fri Jun 28 18:39:01 UTC 2019 # # date 062818432019; date Fri Jun 28 18:43:00 UTC 2019 Fri Jun 28 18:43:00 UTC 2019 # date Fri Jun 28 18:43:04 UTC 2019 -- Regards, Sylwester
