Hie experts,

see below commit:

commit abb959f8a3f125a6e6641abbd020111516dfc8f6
Author: Javi Merino <javi.mer...@arm.com>
Date:   Fri Dec 16 16:04:36 2011 +0100

    ARM: 7237/1: PL330: Fix driver freeze

    Add a req_running field to the pl330_thread to track which request (if
    any) has been submitted to the DMA.  This mechanism replaces the old
    one in which we tried to guess the same by looking at the PC of the
    DMA, which could prevent the driver from sending more requests if it
    didn't guess correctly.

    Reference: <1323631637-9610-1-git-send-email-javi.mer...@arm.com>

    Signed-off-by: Javi Merino <javi.mer...@arm.com>
    Acked-by: Jassi Brar <jaswinder.si...@linaro.org>
    Tested-by: Tushar Behera <tushar.beh...@linaro.org>
    Signed-off-by: Russell King <rmk+ker...@arm.linux.org.uk>

I know git commit -s can add my self with "signed off by me" but how
to get acked by and tested by?

other 2 questions:

1) what does mean acked by?

2) what's the different for the first signed off with the last signed-off



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