[patch] bouncefix-2.5.1-A2

[Ingo Molnar]

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okay, there was another bug as well, this time in the loopback driver: it
did not set up its own bounce limit. This happens because the loopback
driver is a special driver that is not governed by the normal elevator,
thus it does not call blk_init_queue(). So the attached patch has two
fixes:

 - call blk_queue_bounce_limit() from loop.c
 - it fixes the off-by-one bounce-limit bugs in blkdev.h

does this fix your system?

	Ingo

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