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As a fallout, replace filp storage with file_priv storage for "unique
identifier of a client" all over the DRM. There is a 1:1 mapping, so this
should be a noop. This could be a minor performance improvement, as everything
on Linux dereferenced filp to get file_priv anyway, while only the mmap ioctls
went the other direction.
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This was used to make all ioctl handlers return -errno on linux and errno on
*BSD. Instead, just return -errno in shared code, and flip sign on return from
shared code to *BSD code.
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Again, no hardware, so no idea if it'll even work yet. I understand how
the PRAMIN setup works now, un-hardcoding stuff will come "RealSoonNow(tm)".
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Should be OK on G84 for a single channel, multiple channels *almost* work.
Untested on G80.
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