• H. Peter Anvin's avatar
    x32: Handle the x32 system call flag · fca460f9
    H. Peter Anvin authored
    
    
    x32 shares most system calls with x86-64, but unfortunately some
    subsystem (the input subsystem is the chief offender) which require
    is_compat() when operating with a 32-bit userspace.  The input system
    actually has text files in sysfs whose meaning is dependent on
    sizeof(long) in userspace!
    
    We could solve this by having two completely disjoint system call
    tables; requiring that each system call be duplicated.  This patch
    takes a different approach: we add a flag to the system call number;
    this flag doesn't affect the system call dispatch but requests compat
    treatment from affected subsystems for the duration of the system call.
    
    The change of cmpq to cmpl is safe since it immediately follows the
    and.
    Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
    fca460f9