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This reverts commit 47d3904fe4.
Crashes any x86 serial console bootup:
Console: colour VGA+ 80x25
BUG: unable to handle kernel NULL pointer dereference at 0000000000000158
IP: [<ffffffff811ebcb4>] serial8250_do_set_termios+0x1d4/0x430
...
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Greg KH <gregkh@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>