fs: add fsync control driver

switches between enabled, disabled and dynamic fsync.

Change-Id: I5d6fc2d00adbdef490c298bef85c823f9b385455
Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>
Bluetooth: Remove unused hci_le_ltk_reply()

In this API, we were using sizeof operator for an array
given as function argument, which is invalid.
However this API is not used anywhere.

Signed-off-by: Syam Sidhardhan <s.syam@samsung.com>
Signed-off-by: Gustavo Padovan <gustavo@padovan.org>
seq_file: always update file->f_pos in seq_lseek()

This issue was first pointed out by Jiaxing Wang several months ago, but no
further comments:
https://lkml.org/lkml/2013/6/29/41

As we know pread() does not change f_pos, so after pread(), file->f_pos
and m->read_pos become different. And seq_lseek() does not update file->f_pos
if offset equals to m->read_pos, so after pread() and seq_lseek()(lseek to
m->read_pos), then a subsequent read may read from a wrong position, the
following program produces the problem:

    char str1[32] = { 0 };
    char str2[32] = { 0 };
    int poffset = 10;
    int count = 20;

    /*open any seq file*/
    int fd = open("/proc/modules", O_RDONLY);

    pread(fd, str1, count, poffset);
    printf("pread:%s\n", str1);

    /*seek to where m->read_pos is*/
    lseek(fd, poffset+count, SEEK_SET);

    /*supposed to read from poffset+count, but this read from position 0*/
    read(fd, str2, count);
    printf("read:%s\n", str2);

out put:
pread:
 ck_netbios_ns 12665
read:
 nf_conntrack_netbios

/proc/modules:
nf_conntrack_netbios_ns 12665 0 - Live 0xffffffffa038b000
nf_conntrack_broadcast 12589 1 nf_conntrack_netbios_ns, Live 0xffffffffa0386000

So we always update file->f_pos to offset in seq_lseek() to fix this issue.

Signed-off-by: Jiaxing Wang <hello.wjx@gmail.com>
Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Change-Id: If28bd59a0aa5dab2c5de9bb3a2adced271a46a19
[zwliew: backport to find7]
Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>
seq_file: always clear m->count when we free m->buf

Once we'd freed m->buf, m->count should become zero - we have no valid
contents reachable via m->buf.

Reported-by: Charley (Hao Chuan) Chu <charley.chu@broadcom.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/dcache.c: Fix the too small buffer for dname

temp[64] is used for internal temporary buffer in dynamic_dname().
This is for dname. But It's too small. dname's size may be > 64.
In that case, it returns as -ENAMETOOLONG. So Increase the buffer size
to 256 for avoiding this issue.

The following was caused by the small buffer.
WARNING: at /kernel/mm/page_alloc.c:2470 __alloc_pages_nodemask+0x24c/0x938()
CPU: 2 PID: 505 Comm: android.bg Not tainted 3.10.0-g2f73780-00003-g2ff41d9-dirty #13
[<c010ba3c>] (unwind_backtrace+0x0/0x11c) from [<c0109cac>] (show_stack+0x10/0x14)
[<c0109cac>] (show_stack+0x10/0x14) from [<c01939a0>] (warn_slowpath_common+0x48/0x68)
[<c01939a0>] (warn_slowpath_common+0x48/0x68) from [<c0193a7c>] (warn_slowpath_null+0x18/0x20)
[<c0193a7c>] (warn_slowpath_null+0x18/0x20) from [<c0222454>] (__alloc_pages_nodemask+0x24c/0x938)
[<c0222454>] (__alloc_pages_nodemask+0x24c/0x938) from [<c0222b50>] (__get_free_pages+0x10/0x24)
[<c0222b50>] (__get_free_pages+0x10/0x24) from [<c024faf8>] (kmalloc_order_trace+0x24/0xf0)
[<c024faf8>] (kmalloc_order_trace+0x24/0xf0) from [<c024fe20>] (__kmalloc+0x30/0x244)
[<c024fe20>] (__kmalloc+0x30/0x244) from [<c02723c8>] (seq_read+0x270/0x464)
[<c02723c8>] (seq_read+0x270/0x464) from [<c0256a18>] (vfs_read+0xa4/0x134)
[<c0256a18>] (vfs_read+0xa4/0x134) from [<c0256de8>] (SyS_read+0x38/0x68)
[<c0256de8>] (SyS_read+0x38/0x68) from [<c0106140>] (ret_fast_syscall+0x0/0x30)

Change-Id: I74f5217ba3c4be73e91f33f900f1f0c26810cc05
Signed-off-by: Devin Kim <dojip.kim@lge.com>
ksm: check and skip page, if it is already scanned

From: Pradeep Sawlani <sawlani@amazon.com>

On system like Android where most of the process are forked
from parent w/o execve, KSM can scan same page multiple times
in one scan cycle. There is no advantage in scanning same page
multiple times for merging. During testing with Android, it was
observed around 60% pages are skipped for each scan cycle.

Change-Id: I0cf01802f0b4d61fcab92558beb9e1c660dc9a77
Link: http://lkml.kernel.org/r/CAMrOTPgBtANS_ryRjan0-dTL97U7eRvtf3dCsss=Kn+Uk89fuA@mail.gmail.com
Signed-off-by: Pradeep Sawlani <sawlani@amazon.com>
vfs: initialise possibly uninitialised variables

Change-Id: I19d102da520519bb8db369406019d8d0c74aff93
Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>
defconfig: enable ksm check page

Change-Id: I8ff740259346cc25ba607a6a19cc8118118a8906
Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>
cpufreq: interactive: fix sparse warnings by updating cputime64_t to u64

there were few sparse warnings due to mismatch of type on function arguments. two types were used u64 and cputime64_t. both are actually u64, so use u64 only.

Change-Id: I67ee3afc8ee542f62200a49e395fef626b06958a
Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>
cpufreq: cpu-boost: add wake boosting

boost frequency on wake up to speed it up.

Change-Id: I8bbf613d7558168c1f4f8660189e6779fe86a917
Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>