linux/arch/arm64
Nathan Lynch 878854a374 arm64: VDSO: fix coarse clock monotonicity regression
Since 906c55579a ("timekeeping: Copy the shadow-timekeeper over the
real timekeeper last") it has become possible on arm64 to:

- Obtain a CLOCK_MONOTONIC_COARSE or CLOCK_REALTIME_COARSE timestamp
  via syscall.
- Subsequently obtain a timestamp for the same clock ID via VDSO which
  predates the first timestamp (by one jiffy).

This is because arm64's update_vsyscall is deriving the coarse time
using the __current_kernel_time interface, when it should really be
using the timekeeper object provided to it by the timekeeping core.
It happened to work before only because __current_kernel_time would
access the same timekeeper object which had been passed to
update_vsyscall.  This is no longer the case.

Signed-off-by: Nathan Lynch <nathan_lynch@mentor.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2015-08-10 15:37:45 +01:00
..
boot dmaengine fixes for 4.2-rc5 2015-08-01 12:47:04 -07:00
configs
crypto
include
kernel arm64: VDSO: fix coarse clock monotonicity regression 2015-08-10 15:37:45 +01:00
kvm
lib
mm
net
xen
Kconfig
Kconfig.debug
Makefile