[ARM] Add thread_notify infrastructure
authorRussell King <rmk@dyn-67.arm.linux.org.uk>
Wed, 21 Jun 2006 12:31:52 +0000 (13:31 +0100)
committerRussell King <rmk+kernel@arm.linux.org.uk>
Thu, 22 Jun 2006 09:24:18 +0000 (10:24 +0100)
Some machine classes need to allow VFP support to be built into the
kernel, but still allow the kernel to run even though VFP isn't
present.  Unfortunately, the kernel hard-codes VFP instructions
into the thread switch, which prevents this being run-time selectable.

Solve this by introducing a notifier which things such as VFP can
hook into to be informed of events which affect the VFP subsystem
(eg, creation and destruction of threads, switches between threads.)

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

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