lib: genalloc: Change chunk allocation to vmalloc

Change the chunk allocation from kmalloc to vmalloc for
allocations greater than a page. This allows large
chunks to be allocated from physically non-contiguous
memory and increases the chance of the allocation
succeeding.

CRs-fixed: 387655
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>
(cherry picked from commit 0614b96dc8e4c8a0dd0db41aec5a79daa3bdf091)

Conflicts:

	lib/genalloc.c

Change-Id: Ic0dedbad9d277d0842591b1f075ce3b80c8c05de
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
iosched: prevent aliased requests from starving other I/O

Hi, Jens,

If you recall, I posted an RFC patch for this back in July of last year:
http://lkml.org/lkml/2010/7/13/279

The basic problem is that a process can issue a never-ending stream of
async direct I/Os to the same sector on a device, thus starving out
other I/O in the system (due to the way the alias handling works in both
cfq and deadline).  The solution I proposed back then was to start
dispatching from the fifo after a certain number of aliases had been
dispatched.  Vivek asked why we had to treat aliases differently at all,
and I never had a good answer.  So, I put together a simple patch which
allows aliases to be added to the rb tree (it adds them to the right,
though that doesn't matter as the order isn't guaranteed anyway).  I
think this is the preferred solution, as it doesn't break up time slices
in CFQ or batches in deadline.  I've tested it, and it does solve the
starvation issue.  Let me know what you think.

Cheers,
Jeff

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
lib/memcopy: use glibc version

the kernel's memcpy and memmove is very inefficient. But the glibc version is
quite fast, in some cases it is 10 times faster than the kernel version. So I
introduce some memory copy macros and functions of the glibc to improve the
kernel version's performance.

The strategy of the memory functions is:
1. Copy bytes until the destination pointer is aligned.
2. Copy words in unrolled loops.  If the source and destination are not
   aligned in the same way, use word memory operations, but shift and merge
   two read words before writing.
3. Copy the few remaining bytes.

Signed-off-by: Miao Xie <miaox*******>
lib/string: use glibc version

the performance of memcpy and memmove of the general version is very
inefficient, this patch improved them.

Signed-off-by: Miao Xie <miaox*******>
mmc: msm_sdcc: Power down slots after reboot

Some reboot methods (eg. adb reboot) may not power
down SDCC slots. This can result in cards being
in unexpected states after reboot. Explicitly reset
slot voltage regulator on reboot.

CRs-Fixed: 341840
Change-Id: I8cdb52bc58e34900378af468794760653f3babad
Signed-off-by: Oluwafemi Adeyemi <aadeyemi@codeaurora.org>
ARM: entry: no need to increase preempt count for IRQ handlers

X-Git-Tag: v3.1-rc1~258^2~1^3~16
X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=1613cc1119ecdb1bdb950da53065e615e4c4b8db

irq_enter() and irq_exit() already take care of the preempt_count
handling for interrupts, which increment and decrement the hardirq
bits of the preempt count.  So we can remove the preempt count handing
in our IRQ entry/exit assembly, like x86 did some 9 years ago.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>