On Sun, 27 Mar 2005, Chaskiel M Grundman wrote:
linux-ioctl-update: The linux ioctl inode op is evolving, mostly to eliminate it's use of the 'big kernel lock'. A new operation, unlocked_ioctl was added to file_operations. if unlocked_ioctl is present, it is used to handle ioctl operations instead of ioctl.
In addition, another new operation was added, compat_ioctl, which is used when a 32 bit process calls ioctl on a 64 bit kernel (instead of the old way where the 32 bit handlers were registered on a globally on per-ioctl-number basis, rather than being part of the driver or filesystem.)
The nifty thing about this new feature is that it's self identifying!. no new configure tests are needed. details at <http://lwn.net/Articles/119652/>
My hat's off to the person who thought to do this, and I'll buy the a tasty beverage of their choice if I figure out who, and see them. This is the sort of api I like to work with.
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