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[RFC PATCH v2 0/4] Convert ppdev to y2038 safe

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Hi, guys

This is my second attempt to convert ppdev to y2038 safe. The first
version is here[1].

There are two parts in my patches.
01/02 migrate timeval relative struct to 64bit time_t types.
03/04 convert ppdev to y2038 safe in both native 32bit and compat
application.

My patches try to follow the idea from arnd y2038 syscalls patches[2],
but my patches not depend on them.

The reason why I choose ppdev is the ppdev use the timexxx directly
in ioctl compare with the other drivers embedded timexxx in their
own type.

Build pass on arm and arm64 on each patches(with and without
CONFIG_COMPAT_TIME). Unfortunately, there is no parport device
(printer) in my test environment. Hope others could help to test
it.

[1] https://lists.linaro.org/pipermail/y2038/2015-June/000522.html
[2] http://git.kernel.org/cgit/linux/kernel/git/arnd/playground.git/log/?h=y2038-syscalls

Bamvor Zhang Jian (4):
  y2038: add 64bit time_t support in timeval for 32bit architecture
  time64: add timeval64 helper for compat syscalls
  ppdev: add compat ioctl
  y2038: convert ppdev to 2038 safe

 drivers/char/ppdev.c       | 41 ++++++++++++++++++++++++++++++++++-------
 include/linux/compat.h     |  3 +++
 include/linux/time64.h     | 20 ++++++++++++++++++--
 include/uapi/linux/ppdev.h | 14 ++++++++++++--
 include/uapi/linux/time.h  | 16 ++++++++++++++++
 kernel/compat.c            | 17 +++++++++++++++++
 kernel/time/time.c         | 36 ++++++++++++++++++++++++++++++++++++
 7 files changed, 136 insertions(+), 11 deletions(-)

-- 
2.1.4

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[RFC PATCH v2 0/4] Convert ppdev to y2038 safe Bamvor Zhang Jian <bamvor.zhangjian@linaro.org> - 2015-06-29 16:30 +0200
  [RFC PATCH v2 2/4] time64: add timeval64 helper for compat syscalls Bamvor Zhang Jian <bamvor.zhangjian@linaro.org> - 2015-06-29 16:30 +0200
  [RFC PATCH v2 3/4] ppdev: add compat ioctl Bamvor Zhang Jian <bamvor.zhangjian@linaro.org> - 2015-06-29 16:30 +0200
  [RFC PATCH v2 4/4] y2038: convert ppdev to 2038 safe Bamvor Zhang Jian <bamvor.zhangjian@linaro.org> - 2015-06-29 16:30 +0200

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