linux-toradex.git/drivers/mtd/mtdcore.c, branch v3.0.63

mtd: remove add_mtd_partitions, add_mtd_device and friends

2011-05-25T01:25:16+00:00

These symbols are replaced with mtd_device_register() (and removal with
mtd_device_unregister()) for public registration.

Signed-off-by: Jamie Iles 
Signed-off-by: Artem Bityutskiy 
Signed-off-by: David Woodhouse

mtd: introduce mtd_device_(un)register()

2011-05-25T01:12:36+00:00

To prepare for the removal of add_mtd_device and add_mtd_partitions(),
introduce mtd_device_register().  This will create partitions if they
are supplied or register the whole device if there are no partitions.

Once all drivers are converted to use mtd_device_register(),
add_mtd_device() and add_mtd_partitions() will be made internal only.

v2: move kerneldoc to implementation file and fixup some kerneldoc
warnings.

Artem: tweak comments: remove junk tabs, use dots consistently.

Signed-off-by: Jamie Iles 
Signed-off-by: Artem Bityutskiy 
Signed-off-by: David Woodhouse

mtd:fix the bad format in the mtdcore.c

2011-05-25T01:11:56+00:00

Remove the spare spaces in the head of the lines.

Signed-off-by: Wanlong Gao 
Signed-off-by: Artem Bityutskiy 
Signed-off-by: David Woodhouse

mtd: simplify get_mtd_device_nm function

2011-05-25T01:05:49+00:00

'get_mtd_device_nm()' has a piece of code which equivalent to what
'__get_mtd_device()' does - remove this duplicated code and use
''__get_mtd_device()' instead.

Artem: changed commit message.
Artem: while on it, remove an unnecessary extra empty line

Signed-off-by: Wanlong Gao 
Signed-off-by: Artem Bityutskiy 
Signed-off-by: David Woodhouse

mtd: convert to seq_file interface

2011-05-25T01:05:29+00:00

->read_proc interface is going away, switch to seq_file.

Signed-off-by: Alexey Dobriyan 
Acked-by: Mike Frysinger 
Signed-off-by: Andrew Morton 
Signed-off-by: David Woodhouse

mtd: create function to perform large allocations

2011-05-25T00:59:43+00:00

Introduce a common function to handle large, contiguous kmalloc buffer
allocations by exponentially backing off on the size of the requested
kernel transfer buffer until it succeeds or until the requested
transfer buffer size falls below the page size.

This helps ensure the operation can succeed under low-memory, highly-
fragmented situations albeit somewhat more slowly.

Artem: so this patch solves the problem that the kernel tries to kmalloc too
large buffers, which (a) may fail and does fail - people complain about this,
and (b) slows down the system in case of high memory fragmentation, because
the kernel starts dropping caches, writing back, swapping, etc. But we do not
really have to allocate a lot of memory to do the I/O, we may do this even with
as little as one min. I/O unit (NAND page) of RAM. So the idea of this patch is
that if the user asks to read or write a lot, we try to kmalloc a lot, with GFP
flags which make the kernel _not_ drop caches, etc. If we can allocate it - good,
if not - we try to allocate twice as less, and so on, until we reach the min.
I/O unit size, which is our last resort allocation and use the normal
GFP_KERNEL flag.

Artem: re-write the allocation function so that it makes sure the allocated
buffer is aligned to the min. I/O size of the flash.

Signed-off-by: Grant Erickson 
Tested-by: Ben Gardiner 
Tested-by: Stefano Babic 
Signed-off-by: Artem Bityutskiy 
Signed-off-by: David Woodhouse

mtd: local symbols should be static

2011-03-11T14:22:41+00:00

The three backing_dev_info symbols are only used in this file and
should be static.

Signed-off-by: H Hartley Sweeten 
Signed-off-by: Artem Bityutskiy 
Signed-off-by: David Woodhouse

mtd: Remove obsolete include

2010-08-08T20:19:42+00:00

Signed-off-by: David Woodhouse

mtd: Update copyright notices

2010-08-08T19:58:20+00:00

Signed-off-by: David Woodhouse

mtd: update gfp/slab.h includes

2010-05-19T16:21:52+00:00

Implicit slab.h inclusion via percpu.h is about to go away.  Make sure
gfp.h or slab.h is included as necessary.

Signed-off-by: Tejun Heo 
Signed-off-by: David Woodhouse