linux-toradex.git/Documentation, branch v2.6.27.8

epoll: introduce resource usage limits

2008-12-05T18:55:12+00:00

commit 7ef9964e6d1b911b78709f144000aacadd0ebc21 upstream.

It has been thought that the per-user file descriptors limit would also
limit the resources that a normal user can request via the epoll
interface.  Vegard Nossum reported a very simple program (a modified
version attached) that can make a normal user to request a pretty large
amount of kernel memory, well within the its maximum number of fds.  To
solve such problem, default limits are now imposed, and /proc based
configuration has been introduced.  A new directory has been created,
named /proc/sys/fs/epoll/ and inside there, there are two configuration
points:

  max_user_instances = Maximum number of devices - per user

  max_user_watches   = Maximum number of "watched" fds - per user

The current default for "max_user_watches" limits the memory used by epoll
to store "watches", to 1/32 of the amount of the low RAM.  As example, a
256MB 32bit machine, will have "max_user_watches" set to roughly 90000.
That should be enough to not break existing heavy epoll users.  The
default value for "max_user_instances" is set to 128, that should be
enough too.

This also changes the userspace, because a new error code can now come out
from EPOLL_CTL_ADD (-ENOSPC).  The EMFILE from epoll_create() was already
listed, so that should be ok.

[akpm@linux-foundation.org: use get_current_user()]
Signed-off-by: Davide Libenzi 
Cc: Michael Kerrisk 
Cc: Cyrill Gorcunov 
Reported-by: Vegard Nossum 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

cciss: new hardware support

2008-11-13T17:55:57+00:00

commit 77ca7286d10b798e4907af941f29672bf484db77 upstream

cciss: new hardware support

Add support for 2 new SAS/SATA controllers.

Signed-off-by: Mike Miller 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

i2c: The i2c mailing list is moving

2008-11-07T03:05:46+00:00

commit 846557d3ceb6c7493e090921db5d6158ec237228 upstream

Replace all references to the old i2c mailing list.

This isn't a bug fix, but I would hate to miss bug reports because
they're sent to a dead mailing list.

Signed-off-by: Jean Delvare 
Signed-off-by: Greg Kroah-Hartman

DVB: au0828: add support for another USB id for Hauppauge HVR950Q

2008-10-22T21:21:29+00:00

(cherry picked from commit a636da6bab3307fc8c6e6a22a63b0b25ba0687be)

DVB: au0828: add support for another USB id for Hauppauge HVR950Q

Add autodetection support for a new revision of the Hauppauge HVR950Q (2040:721e)

Signed-off-by: Michael Krufky 
Signed-off-by: Mauro Carvalho Chehab 
Signed-off-by: Greg Kroah-Hartman

Merge branch 'hwmon-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6

2008-10-09T19:23:54+00:00

* 'hwmon-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6:
  hwmon: (abituguru3) Enable DMI probing feature on Abit AT8 32X
  hwmon: (abituguru3) Enable reading from AUX3 fan on Abit AT8 32X
  hwmon: (adt7473) Fix some bogosity in documentation file
  hwmon: Define sysfs interface for energy consumption register
  hwmon: (it87) Prevent power-off on Shuttle SN68PT
  eeepc-laptop: Fix hwmon interface

[CPUFREQ] correct broken links and email addresses

2008-10-09T17:52:40+00:00

Replace the no longer working links and email address in the
documentation and in source code.

Signed-off-by: Márton Németh 
Signed-off-by: Dave Jones

hwmon: (adt7473) Fix some bogosity in documentation file

2008-10-09T13:33:58+00:00

Signed-off-by: Darrick J. Wong 
Signed-off-by: Jean Delvare

hwmon: Define sysfs interface for energy consumption register

2008-10-09T13:33:58+00:00

Describe the sysfs files that were introduced in the ibmaem driver.

Signed-off-by: Darrick J. Wong 
Signed-off-by: Jean Delvare

Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/v4l-dvb

2008-10-06T21:27:15+00:00

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/v4l-dvb: (33 commits)
  V4L/DVB (9103): em28xx: HVR-900 B3C0 - fix audio clicking issue
  V4L/DVB (9099): em28xx: Add detection for K-WORLD DVB-T 310U
  V4L/DVB (9092): gspca: Bad init values for sonixj ov7660.
  V4L/DVB (9080): gspca: Add a delay after writing to the sonixj sensors.
  V4L/DVB (9075): gspca: Bad check of returned status in i2c_read() spca561.
  V4L/DVB (9053): fix buffer overflow in uvc-video
  V4L/DVB (9043): S5H1420: Fix size of shadow-array to avoid overflow
  V4L/DVB (9037): Fix support for Hauppauge Nova-S SE
  V4L/DVB (9029): Fix deadlock in demux code
  V4L/DVB (8979): sms1xxx: Add new USB product ID for Hauppauge WinTV MiniStick
  V4L/DVB (8978): sms1xxx: fix product name for Hauppauge WinTV MiniStick
  V4L/DVB (8967): Use correct XC3028L firmware for AMD ATI TV Wonder 600
  V4L/DVB (8963): s2255drv field count fix
  V4L/DVB (8961): zr36067: Fix RGBR pixel format
  V4L/DVB (8960): drivers/media/video/cafe_ccic.c needs mm.h
  V4L/DVB (8958): zr36067: Return proper bytes-per-line value
  V4L/DVB (8957): zr36067: Restore the default pixel format
  V4L/DVB (8955): bttv: Prevent NULL pointer dereference in radio_open
  V4L/DVB (8935): em28xx-cards: Remove duplicate entry (EM2800_BOARD_KWORLD_USB2800)
  V4L/DVB (8933): gspca: Disable light frquency for zc3xx cs2102 Kokom.
  ...

V4L/DVB (9099): em28xx: Add detection for K-WORLD DVB-T 310U

2008-10-05T02:15:17+00:00

Correct firmware type to MTS
Correct audio routing for composite/s-video
Add DVB-T detection.

This patch uses the eeprom hash method for detection as the vendor/product
ids are also used for the DIGIVOX_AD. This may be a clone of the same
product. Explanatory text has been added prior to the hask look-up in
anticipation that it may help others.

The following has been tested to work:
Analogue TV (PAL-I)
Composite In
DVB-T (UK Crystal Palace)
USB AUDIO

The following has not been tested but probably works:
S-Video In

Signed-off-by: Darron Broad 
Signed-off-by: Douglas Schilling Landgraf 
Signed-off-by: Mauro Carvalho Chehab