In place kexec
dwmw2 at infradead.org
Fri Jul 30 15:46:12 EDT 2010
On Fri, 30 Jul 2010, Eric W. Biederman wrote:
> David Woodhouse <dwmw2 at infradead.org> writes:
>> The DMA gets blocked, and you don't have to worry about whether the device was
>> shut down cleanly or not. The device may be unhappy, but when the new kernel's
>> driver loads and reinitialises it, all should be forgiven.
> Assuming IOMMU page faults don't cause pain. I seem to remember that
> also being a nasty issue.
Only if the driver (or the hardware) is so broken that it can't reccover.
There's very little excuse for a driver to have that problem even at
runtime (and fail to recover from such an error)... for a driver to fail
to initialise the hardware even when that driver is first being loaded is
Not that it doesn't happen, of course. But do we care? I lump those
broken drivers is the same class as the ones which only work after a warm
start from Windows or Mac OS.
More information about the kexec