These series of patches try to convert parport device(ppdev) to y2038 safe, and support y2038 safe and unsafe application at the same time. The first version is here.
An y2038 safe application/kernel use 64bit time_t(aka time64_t) to avoid 32-bit time types broken in the year 2038. Given that some time relative struct(e.g. timeval in ppdev.c) is mainly the offset of the real time, the old 32bit time_t in such application is safe. We need to handle the 32bit time_t and 64bit time_t application at the same time. My approach here is handle them as different ioctl command for different size of timeval.
Build successful on arm64, arm and x86_64.
Changes since v1: 1. Fix the warning when build against x86_64.
Bamvor Jian Zhang (2): ppdev: convert to y2038 safe ppdev: add support for compat ioctl
drivers/char/ppdev.c | 87 ++++++++++++++++++++++++++++++++++++++++------------ 1 file changed, 67 insertions(+), 20 deletions(-)