Defines starting with `p' in kern

• PAGESIZE kern/kern_lkm.c:60
• PF_COPEN kern/tty_pty.c:76
• PF_NOSTOP kern/tty_pty.c:81
• PF_PKT kern/tty_pty.c:78
• PF_REMOTE kern/tty_pty.c:80
• PF_SOPEN kern/tty_pty.c:77
• PF_STOPPED kern/tty_pty.c:79
• PF_UCNTL kern/tty_pty.c:82
• PIPSIZ kern/uipc_usrreq.c:314
• PPQ kern/kern_synch.c:196