1WAIT_ON_BIT_LOCK_IO(9)           Driver Basics          WAIT_ON_BIT_LOCK_IO(9)
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NAME

6       wait_on_bit_lock_io - wait for a bit to be cleared, when wanting to set
7       it
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SYNOPSIS

10       int wait_on_bit_lock_io(void * word, int bit, unsigned mode);
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ARGUMENTS

13       word
14           the word being waited on, a kernel virtual address
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16       bit
17           the bit of the word being waited on
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19       mode
20           the task state to sleep in
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DESCRIPTION

23       Use the standard hashed waitqueue table to wait for a bit to be cleared
24       and then to atomically set it. This is similar to wait_on_bit, but
25       calls io_schedule instead of schedule for the actual waiting.
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27       Returns zero if the bit was (eventually) found to be clear and was set.
28       Returns non-zero if a signal was delivered to the process and the mode
29       allows that signal to wake the process.
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32Kernel Hackers Manual 3.10         June 2019            WAIT_ON_BIT_LOCK_IO(9)
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