The following changes since commit 60cc43fc888428bb2f18f08997432d426a243338:

Linux 4.17-rc1 (2018-04-15 18:24:20 -0700)

are available in the git repository at:

git+ssh://gitolite@ra.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git tags/y2038-timekeeping

for you to fetch changes up to 2e294d2c97d6683fcdf1134d87be1c461dff8ffd:

nanosleep: change time types to safe __kernel_* types (2018-04-19 10:07:58 +0200)

---------------------------------------------------------------- y2038: timekeeping syscall changes

This is the first set of system call entry point changes to enable 32-bit architectures to have variants on both 32-bit and 64-bit time_t. Typically these system calls take a 'struct timespec' argument, but that structure is defined in user space by the C library and its layout will change.

The kernel already supports handling the 32-bit time_t on 64-bit architectures through the CONFIG_COMPAT mechanism. As there are a total of 51 system calls suffering from this problem, reusing that mechanism on 32-bit architectures.

We already have patches for most of the remaining system calls, but this set contains most of the complexity and is best tested. There was one last-minute regression that prevented it from going into 4.17, but that is fixed now.

More details from Deepa's patch series description:

Big picture is as per the lwn article: https://lwn.net/Articles/643234/ [2]

The series is directed at converting posix clock syscalls: clock_gettime, clock_settime, clock_getres and clock_nanosleep to use a new data structure __kernel_timespec at syscall boundaries. __kernel_timespec maintains 64 bit time_t across all execution modes.

vdso will be handled as part of each architecture when they enable support for 64 bit time_t.

The compat syscalls are repurposed to provide backward compatibility by using them as native syscalls as well for 32 bit architectures. They will continue to use timespec at syscall boundaries.

CONFIG_64_BIT_TIME controls whether the syscalls use __kernel_timespec or timespec at syscall boundaries.

The series does the following: 1. Enable compat syscalls on 32 bit architectures. 2. Add a new __kernel_timespec type to be used as the data structure for all the new syscalls. 3. Add new config CONFIG_64BIT_TIME(intead of the CONFIG_COMPAT_TIME in [1] and [2] to switch to new definition of __kernel_timespec. It is the same as struct timespec otherwise. 4. Add new CONFIG_32BIT_TIME to conditionally compile compat syscalls.

---------------------------------------------------------------- Arnd Bergmann (2): compat: add an asm-generic/compat.h file sparc: compat: allow including asm/compat.h for 32-bit

Deepa Dinamani (10): compat: Make compat helpers independent of CONFIG_COMPAT include: Move compat_timespec/ timeval to compat_time.h compat: enable compat_get/put_timespec64 always arch: introduce CONFIG_64BIT_TIME arch: Introduce CONFIG_COMPAT_32BIT_TIME posix-clocks: Make compat syscalls depend on CONFIG_COMPAT_32BIT_TIME include: Add new y2038 safe __kernel_timespec fix get_timespec64() for y2038 safe compat interfaces change time types to new y2038 safe __kernel_* types nanosleep: change time types to safe __kernel_* types

arch/Kconfig | 15 +++++++++ arch/alpha/include/asm/Kbuild | 1 + arch/arc/include/asm/Kbuild | 1 + arch/arm/include/asm/Kbuild | 1 + arch/arm64/include/asm/compat.h | 11 ------- arch/arm64/include/asm/stat.h | 1 + arch/arm64/kernel/hw_breakpoint.c | 1 - arch/arm64/kernel/perf_regs.c | 2 +- arch/c6x/include/asm/Kbuild | 1 + arch/h8300/include/asm/Kbuild | 1 + arch/hexagon/include/asm/Kbuild | 1 + arch/ia64/include/asm/Kbuild | 1 + arch/m68k/include/asm/Kbuild | 1 + arch/microblaze/include/asm/Kbuild | 1 + arch/mips/include/asm/compat.h | 11 ------- arch/mips/kernel/signal32.c | 2 +- arch/nds32/include/asm/Kbuild | 1 + arch/nios2/include/asm/Kbuild | 1 + arch/openrisc/include/asm/Kbuild | 1 + arch/parisc/include/asm/compat.h | 11 ------- arch/powerpc/include/asm/compat.h | 11 ------- arch/powerpc/kernel/asm-offsets.c | 2 +- arch/powerpc/oprofile/backtrace.c | 1 + arch/s390/hypfs/hypfs_sprp.c | 1 - arch/s390/include/asm/compat.h | 11 ------- arch/s390/include/asm/elf.h | 4 +-- arch/s390/kvm/priv.c | 1 - arch/s390/pci/pci_clp.c | 1 - arch/sh/include/asm/Kbuild | 1 + arch/sparc/include/asm/compat.h | 15 +++------ arch/um/include/asm/Kbuild | 1 + arch/unicore32/include/asm/Kbuild | 1 + arch/x86/events/core.c | 2 +- arch/x86/include/asm/compat.h | 11 ------- arch/x86/include/asm/ftrace.h | 2 +- arch/x86/kernel/sys_x86_64.c | 2 +- arch/xtensa/include/asm/Kbuild | 1 + drivers/s390/block/dasd_ioctl.c | 1 - drivers/s390/char/fs3270.c | 1 - drivers/s390/char/sclp_ctl.c | 1 - drivers/s390/char/vmcp.c | 1 - drivers/s390/cio/chsc_sch.c | 1 - drivers/s390/net/qeth_core_main.c | 2 +- include/asm-generic/compat.h | 3 ++ include/linux/compat.h | 12 ++++--- include/linux/compat_time.h | 23 ++++++++++++++ include/linux/restart_block.h | 7 ++-- include/linux/syscalls.h | 13 ++++---- include/linux/time.h | 4 +-- include/linux/time64.h | 10 +++++- include/uapi/asm-generic/posix_types.h | 1 + include/uapi/linux/time.h | 7 ++++ kernel/compat.c | 52 +++++------------------------- kernel/time/hrtimer.c | 10 ++++-- kernel/time/posix-stubs.c | 12 ++++--- kernel/time/posix-timers.c | 24 ++++++++++---- kernel/time/time.c | 58 +++++++++++++++++++++++++++++++--- 57 files changed, 201 insertions(+), 176 deletions(-) create mode 100644 include/asm-generic/compat.h create mode 100644 include/linux/compat_time.h