lib: Add support for LZ4-compressed kernel

Date	Tue, 26 Feb 2013 15:24:28 +0900

This patch adds support for extracting LZ4-compressed kernel images,
as well as LZ4-compressed ramdisk images in the kernel boot process.

This depends on the patch below
decompressor: Add LZ4 decompressor module

Signed-off-by: Kyungsik Lee <kyungsik.lee@lge.com>

v2:
- Clean up code
- Use lz4_decompress() for LZ4-compressed kernel during boot-process

Signed-off-by: Paul Reioux <reioux@gmail.com>
arm: Add support for LZ4-compressed kernel

Date	Tue, 26 Feb 2013 15:24:29 +0900

This patch integrates the LZ4 decompression code to the arm pre-boot code.
And it depends on two patchs below

lib: Add support for LZ4-compressed kernel
decompressor: Add LZ4 decompressor module

Signed-off-by: Kyungsik Lee <kyungsik.lee@lge.com>

v2:
- Apply CFLAGS, -Os to decompress.o to improve decompress
  performance during boot-up process

Signed-off-by: Paul Reioux <reioux@gmail.com>

Conflicts:
	arch/arm/boot/compressed/Makefile
lib: Add lz4 compressor module

From	Chanho Min <>

This patch adds support for LZ4 compression in the Linux Kernel.
LZ4 Compression APIs for kernel are based on LZ4 implementation
by Yann Collet and changed with kernel coding style.

LZ4 homepage : http://fastcompression.blogspot.com/p/lz4.html
LZ4 source repository : http://code.google.com/p/lz4/
svn revision : r90

Two APIs are added:
lz4_compress() support basic lz4 compression whereas lz4hc_compress() support
high compression or CPU performance get lower but compression ratio get higher.
Also, we require the pre-allocated working memory with the defined size and
destination buffer must be allocated with the size of lz4_compressbound.

Signed-off-by: Chanho Min <chanho.min@lge.com>

Signed-off-by: Paul Reioux <reioux@gmail.com>
crypto: Add lz4 Cryptographic API

From	Chanho Min <>

This patch adds support for lz4 and lz4hc compression algorithm
using the lib/lz4/* codebase.
Signed-off-by: Chanho Min <chanho.min@lge.com>

Signed-off-by: Paul Reioux <reioux@gmail.com>
lib/lz4/lz4_compress: fix macro usage error

Signed-off-by: Paul Reioux <reioux@gmail.com>
LZ4: compression/decompression signedness mismatch (v2)

LZ4 compression and decompression functions require different
in signedness input/output parameters: unsigned char for
compression and signed char for decompression.

Change decompression API to require "(const) unsigned char *".

v2: minor coding style fix.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>

Signed-off-by: Paul Reioux <reioux@gmail.com>
staging: zram: add Crypto API support

Date    Tue, 30 Jul 2013 14:30:48 +0200

Current version of zram does not allow any substitution of a default
compression algorithm. Therefore, I decided to change the existing
implementation of page compression by adding Crypto API compability.

All direct calls to lzo1x compression/decompression methods are now
replaced by calls consistent with Crypto. Also, I removed "workmem"
field from struct zram_meta, as it was there for lzo1x purposes only
and is no longer needed. Finally, I added a set of functions required
by Crypto API to work properly.

In order to substitute the default algorithm (lzo), change the value
of zram.compressor module parameter to a proper name (e.g. lz4).

Signed-off-by: Piotr Sarna <p.sarna@partner.samsung.com>
Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

backported to Linux 3.1 by faux123

Signed-off-by: Paul Reioux <reioux@gmail.com>
staging: zram: add per-cpu support to Crypto

Date	Tue, 30 Jul 2013 14:30:49 +0200

Since original zram code did not implement any per-cpu operations,
my previous patch (staging: zram: add Crypto API support) did not
include them either.

This patch complements the first one with per-cpu support for Crypto,
allocating tfms buffer separately for each online processor.
Changes are based on zswap and zcache per-cpu code.

Basic tests (concurrent writing several 10-40MB chunks to zram) performed
on an ARM-based EXYNOS4412 Quad-Core showed that per-cpu code provides
noticeable time saving, ranging between 30-40% for LZO and LZ4 compressors.
Sample data (LZO): writing 160MB, 40MB per thread took 0.60s with per-cpu
code included and approximately 0.80s without per-cpu support.

Signed-off-by: Piotr Sarna <p.sarna@partner.samsung.com>
Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

backported to Linux 3.1 by faux123

Signed-off-by: Paul Reioux <reioux@gmail.com>
zram_drv: switch default compressor to new lz4

Signed-off-by: Paul Reioux <reioux@gmail.com>
zcache-main.c: use MACRO define instead of hardcoded default of lzo

Signed-off-by: Paul Reioux <reioux@gmail.com>
zcache-main: switch to lz4 as default

Signed-off-by: Paul Reioux <reioux@gmail.com>
ipv6: introdcue __ipv6_addr_needs_scope_id and ipv6_iface_scope_id helper functions

[net-next commit b7ef213ef65256168df83ddfbb8131ed9adc10f9]

__ipv6_addr_needs_scope_id checks if an ipv6 address needs to supply
a 'sin6_scope_id != 0'. 'sin6_scope_id != 0' was enforced in case
of link-local addresses. To support interface-local multicast these
checks had to be enhanced and are now consolidated into these new helper
functions.

v2:
a) migrated to struct ipv6_addr_props

v3:
a) reverted changes for ipv6_addr_props
b) test for address type instead of comparing scope

v4:
a) unchanged

Change-Id: Id6fc54cec61f967928e08a9eba4f857157d973a3
Suggested-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Cc: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
net: ipv6: Add IPv6 support to the ping socket.

[backport of net-next 6d0bfe22611602f36617bc7aa2ffa1bbb2f54c67]

This adds the ability to send ICMPv6 echo requests without a
raw socket. The equivalent ability for ICMPv4 was added in
2011.

Instead of having separate code paths for IPv4 and IPv6, make
most of the code in net/ipv4/ping.c dual-stack and only add a
few IPv6-specific bits (like the protocol definition) to a new
net/ipv6/ping.c. Hopefully this will reduce divergence and/or
duplication of bugs in the future.

Caveats:

- Setting options via ancillary data (e.g., using IPV6_PKTINFO
  to specify the outgoing interface) is not yet supported.
- There are no separate security settings for IPv4 and IPv6;
  everything is controlled by /proc/net/ipv4/ping_group_range.
- The proc interface does not yet display IPv6 ping sockets
  properly.

Tested with a patched copy of ping6 and using raw socket calls.
Compiles and works with all of CONFIG_IPV6={n,m,y}.

Change-Id: Ia359af556021344fc7f890c21383aadf950b6498
Signed-off-by: Lorenzo Colitti <lorenzo@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[lorenzo@google.com: backported to 3.0]
Signed-off-by: Lorenzo Colitti <lorenzo@google.com>

Conflicts:
	net/ipv4/ping.c
ping: always initialize ->sin6_scope_id and ->sin6_flowinfo

[net-next commit c26d6b46da3ee86fa8a864347331e5513ca84c2b]

If we don't need scope id, we should initialize it to zero.
Same for ->sin6_flowinfo.

Change-Id: I28e4bc9593e76fc3434052182466fab4bb8ccf3a
Cc: Lorenzo Colitti <lorenzo@google.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Cong Wang <amwang@redhat.com>
Acked-by: Lorenzo Colitti <lorenzo@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net: wireless: bcmdhd: Enable p2p support bits for p2p device

Change-Id: Ie3537aaeecdbbddb5219b41c42f2f6ac5d85f5b4
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
net: ipv6: add missing lock in ping_v6_sendmsg

[net-next commit a1bdc45580fc19e968b32ad27cd7e476a4aa58f6]

Bug: 9469865
Change-Id: I7ae28d29c645c535e570eb8d12f45e8eafd9c70b
Signed-off-by: Lorenzo Colitti <lorenzo@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net: ipv6: fix wrong ping_v6_sendmsg return value

[net-next commit fbfe80c890a1dc521d0b629b870e32fcffff0da5]

ping_v6_sendmsg currently returns 0 on success. It should return
the number of bytes written instead.

Bug: 9469865
Change-Id: I86eb936e06bf8582975d59597e48e2bcc53b958d
Signed-off-by: Lorenzo Colitti <lorenzo@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net: wireless: bcmdhd: Fix roaming to hidden AP

Change-Id: Id64d12962049833e19705fbe109ef04b60014079
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
net: wireless: bcmdhd: Inject EID value if it has 0 length

Change-Id: Ifd102bee45e1a1e04ba015c39631a741ca74d6ee
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
net: wireless: bcmdhd: Clean scan status if request is empty

Change-Id: I1c00b5a84846faf316305f57a6a74ded2288a6fd
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>