ARM: vfp: fix vfp_sync_state()

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The more I look at vfp_sync_state(), the more I believe it's trying
to do its job in a really obscure way.

Essentially, last_VFP_context[] tracks who owns the state in the VFP
hardware.  If last_VFP_context[] is the context for the thread which
we're interested in, then the VFP hardware has context which is not
saved in the software state - so we need to bring the software state
up to date.

If last_VFP_context[] is for some other thread, we really don't care
what state the VFP hardware is in; it doesn't contain any information
pertinent to the thread we're trying to deal with - so don't touch
the hardware.

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

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Russell King 2010-02-06 11:27:45 +00:00

parent 462f39a8c7

commit 54cb3dbb4a

1 changed files with 16 additions and 20 deletions

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arch/arm/vfp/vfpmodule.c

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