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Conflicts:
README
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kblockd work queue doesn't work. It might be a bug in DDE.
On the other hand, the default work queue isn't used in a DDE driver, so
it should be enough to use the default one.
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Some functions such as blk_plug_device checks whether irqs are disabled.
So I need to fake irq diable in spin_lock_irq and spin_lock_irqsave.
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It's necessary when we do it in the user space, as that the CPU switches
to other processes and the result is too imprecise.
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It's not very precise to implement udelay and ndelay with loops
in the user space, but should be enough.
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check the negative error value.
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This reverts commit 198a98db43a1cce35242ea5cc12e1d9c5c57db40.
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if hurd is built in its source tree, nothing needs to be changed.
but if hurd is built in a separate directory, BUILDDIR has to specify
the path where hurd is built.
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