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Jens Axboe 5dd531a03a block: add function call to switch the IO scheduler from a driver 
Currently drivers must do an elevator_exit() + elevator_init()
to switch IO schedulers. There are a few problems with this:

- Since commit 1abec4fdbb,
  elevator_init() requires a zeroed out q->elevator
  pointer. The two existing in-kernel users don't do that.

- It will only work at initialization time, since using the
  above two-staged construct does not properly quisce the queue.

So add elevator_change() which takes care of this, and convert
the elv_iosched_store() sysfs interface to use this helper as well.

Reported-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Reported-by: Kevin Vigor <kevin@vigor.nu>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
 		2010-08-23 13:52:19 +02:00
..
acpi Merge branch 'linus' into release 2010-08-15 01:06:31 -04:00
asm-generic Fix the declaration of sys_execve() in asm-generic/syscalls.h 2010-08-18 12:12:38 -07:00
crypto
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drm include: replace unifdef-y with header-y 2010-08-14 22:26:51 +02:00
keys DNS: Separate out CIFS DNS Resolver code 2010-08-05 17:17:51 +00:00
linux block: add function call to switch the IO scheduler from a driver 2010-08-23 13:52:19 +02:00
math-emu
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media V4L/DVB: cx2341x: convert to the control framework 2010-08-08 23:43:05 -03:00
mtd mtd: Update copyright notices 2010-08-08 20:58:20 +01:00
net Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6 2010-08-10 15:59:38 -07:00
pcmcia pcmcia: use struct resource for PCMCIA devices, part 2 2010-08-03 09:04:16 +02:00
rdma IB: Rename RAW_ETY to RAW_ETHERTYPE 2010-08-04 10:44:19 -07:00
rxrpc
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scsi scsi: use __uX types for headers exported to user space 2010-08-11 08:59:01 -07:00
sound ALSA: emu10k1 - delay the PCM interrupts (add pcm_irq_delay parameter) 2010-08-18 15:10:59 +02:00
trace workqueue: Add basic tracepoints to track workqueue execution 2010-08-21 13:19:37 -07:00
video include: replace unifdef-y with header-y 2010-08-14 22:26:51 +02:00
xen Merge branch 'stable/xen-swiotlb-0.8.6' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen 2010-08-12 09:09:41 -07:00
Kbuild
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