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ARM: vfp: improve commentry for hotplug events

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Improve the documentation for the VFP hotplug notifier handler, so
that people better understand what's going on there and what has
been done for them.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2011-01-31 14:43:25 +00:00
parent aaa50048f6
commit 74c25beeb3
1 changed files with 5 additions and 2 deletions
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7
arch/arm/vfp/vfpmodule.c
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@ -489,8 +489,11 @@ void vfp_flush_hwstate(struct thread_info *thread)
/*
* VFP hardware can lose all context when a CPU goes offline.
* Safely clear our held state when a CPU has been killed, and
* re-enable access to VFP when the CPU comes back online.
* As we will be running in SMP mode with CPU hotplug, we will save the
* hardware state at every thread switch. We clear our held state when
* a CPU has been killed, indicating that the VFP hardware doesn't contain
* a threads VFP state. When a CPU starts up, we re-enable access to the
* VFP hardware.
*
* Both CPU_DYING and CPU_STARTING are called on the CPU which
* is being offlined/onlined.