kernel_optimize_test/include/uapi
Mikulas Patocka 02cde50b7e dm ioctl: optimize functions without variable params
Device-mapper ioctls receive and send data in a buffer supplied
by userspace.  The buffer has two parts.  The first part contains
a 'struct dm_ioctl' and has a fixed size.  The second part depends
on the ioctl and has a variable size.

This patch recognises the specific ioctls that do not use the variable
part of the buffer and skips allocating memory for it.

In particular, when a device is suspended and a resume ioctl is sent,
this now avoid memory allocation completely.

The variable "struct dm_ioctl tmp" is moved from the function
copy_params to its caller ctl_ioctl and renamed to param_kernel.
It is used directly when the ioctl function doesn't need any arguments.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2013-03-01 22:45:49 +00:00
..
asm-generic Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2013-02-23 18:50:11 -08:00
drm drm/omap: move out of staging 2013-02-16 17:38:06 -05:00
linux dm ioctl: optimize functions without variable params 2013-03-01 22:45:49 +00:00
mtd
rdma IB/uverbs: Implement memory windows support in uverbs 2013-02-21 11:59:09 -08:00
scsi
sound ALSA: compress: add support for gapless playback 2013-02-14 12:30:22 +01:00
video
xen
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