• Arnd Bergmann's avatar
    y2038: globally rename compat_time to old_time32 · 9afc5eee
    Arnd Bergmann authored
    Christoph Hellwig suggested a slightly different path for handling
    backwards compatibility with the 32-bit time_t based system calls:
    
    Rather than simply reusing the compat_sys_* entry points on 32-bit
    architectures unchanged, we get rid of those entry points and the
    compat_time types by renaming them to something that makes more sense
    on 32-bit architectures (which don't have a compat mode otherwise),
    and then share the entry points under the new name with the 64-bit
    architectures that use them for implementing the compatibility.
    
    The following types and interfaces are renamed here, and moved
    from linux/compat_time.h to linux/time32.h:
    
    old				new
    ---				---
    compat_time_t			old_time32_t
    struct compat_timeval		struct old_timeval32
    struct compat_timespec		struct old_timespec32
    struct compat_itimerspec	struct old_itimerspec32
    ns_to_compat_timeval()		ns_to_old_timeval32()
    get_compat_itimerspec64()	get_old_itimerspec32()
    put_compat_itimerspec64()	put_old_itimerspec32()
    compat_get_timespec64()		get_old_timespec32()
    compat_put_timespec64()		put_old_timespec32()
    
    As we already have aliases in place, this patch addresses only the
    instances that are relevant to the system call interface in particular,
    not those that occur in device drivers and other modules. Those
    will get handled separately, while providing the 64-bit version
    of the respective interfaces.
    
    I'm not renaming the timex, rusage and itimerval structures, as we are
    still debating what the new interface will look like, and whether we
    will need a replacement at all.
    
    This also doesn't change the names of the syscall entry points, which can
    be done more easily when we actually switch over the 32-bit architectures
    to use them, at that point we need to change COMPAT_SYSCALL_DEFINEx to
    SYSCALL_DEFINEx with a new name, e.g. with a _time32 suffix.
    Suggested-by: default avatarChristoph Hellwig <hch@infradead.org>
    Link: https://lore.kernel.org/lkml/20180705222110.GA5698@infradead.org/Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
    9afc5eee
restart_block.h 1.09 KB