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RFC: Exporting NOCMTIME to userspace
Hello all, I'm currently investigating various techniques to lessen the block erase load on consumer nand flash devices (usb-ftl + nand and sd-ftl + nand). While SSDs are of no current interest to me, this use case applies to them as well. The use ...
Message posted on the June 21st, 2010 - 2:50 AM ET
stdout on ttySX for the first userspace program
Hello, I'm working on an embedded kernel for PowerPC 460 (board like amcc canyonland). I'm compiling for ARCH=powerpc and I'm using the DTS methode (not the kernel wrapper, uboot is in powerpc with lib_of) My serial terminal is connected to ttyS2 ...
Message posted on the May 28th, 2010 - 10:58 AM ET
Accessing peripheral register directly from userspace
Would there be any issues for optimization purpose I do a mmap to a peripheral register to directly access it from userspace ? This is considering the peripheral already has a Kernel driver through which you can set the register bit. Basically I ...
Message posted on the April 12th, 2010 - 1:10 PM ET
Bug#569663: xserver-xorg-video-radeon: "You have old & broken userspace please consider updating mesa & xf86-video-ati"
Package: xserver-xorg-video-radeon Version: 1:6.12.99+git20100201.a887818f-1 Severity: normal With upstream kernel 2.6.33-rc8, running glxgears causes the following message to appear in dmesg (only once per boot): radeon: You have old & broken ...
Message posted on the February 13th, 2010 - 4:30 AM ET
possible ERESTARTNOHAND leak into userspace
Hi, this has already been discussed few years back with reports that select returned with ERESTARTNOHAND in multi-threaded applications (http://forum.soft32.com/linux/PATCH-select-fix-sys_select-leak-ERESTARTNOHAND-userspace-ftopict338572.html) ...
Message posted on the December 23rd, 2011 - 8:20 AM ET
[PATCH] 9p: Don't use ATTR_* values from fs.h in userspace facing structs
struct p9_iattr_dotl is userspace facing, but the 'valid' field is documented as follows: * @valid: bitfield specifying which fields are valid * same as in struct iattr Which means that the user has to know about kernel internal ATTR_* ...
Message posted on the December 17th, 2011 - 10:10 AM ET
md: Fix userspace free_pages() macro
While using etags to find free_pages(), I stumbled across this debug definition of free_pages() that is to be used while debugging some raid code in userspace. The __get_free_pages() allocates the correct size, but the free_pages() does not match. ...
Message posted on the December 14th, 2011 - 8:40 AM ET
[perf] enable raw OFFCORE_EVENTS for non-perf userspace
Hello I propose we just enable raw OFFCORE_EVENT support and get it over with. There is a lot of demand for this from PAPI users, and so we encourage them to apply the below patch. PAPI supports this out of the box. The current "block" ...
Message posted on the August 3rd, 2011 - 12:10 PM ET
warning because of race between userspace and add_disk()?
Hi Jens! I'm seeing the warning below (with 3.0-rc5) when I hot-add a disk. The system has a JBOD with 4 SAS paths, so we get 4 /dev/sdXX for the disk (I don't think this is strictly required to trigger this, but I think it makes the race bigger). ...
Message posted on the July 5th, 2011 - 8:20 PM ET
[RELEASE] Userspace RCU 0.6.0
liburcu is a LGPLv2.1 userspace RCU (read-copy-update) library. This data synchronization library provides read-side access which scales linearly with the number of cores. It does so by allowing multiples copies of a given data structure to live at ...
Message posted on the June 10th, 2011 - 9:20 PM ET
Bluetooth: l2cap and rfcomm: fix 1 byte infoleak to userspace.
Hi, Structures "l2cap_conninfo" and "rfcomm_conninfo" have one padding byte each. This byte in "cinfo" is copied to userspace uninitialized. patch no.1: a/net/bluetooth/l2cap_sock.c 2011-05-04 ...
Message posted on the May 8th, 2011 - 4:00 PM ET
compiling of tools/perf fail on x86 64bit kernel and 32bit userspace
Hi, with latest git, i cannot compile perf on 32 bit userspace with a 64 bit kernel. ~/src/linux-2.6/tools/perf$ make PERF_VERSION = 2.6.39.rc6.224.g06d006f GEN common-cmds.h * new build flags or prefix CC perf.o CC builtin-annotate.o CC ...
Message posted on the May 6th, 2011 - 1:00 PM ET
[BUG] pgprot_noncached() is -NOT- safe for mapping vmalloc buffers into userspace
Hi Takashi ! While working on endian-fixing xHCI with Matt (CC), we discovered the source of our problems with usb-audio on a board we were working on. c32d977b8157bf67cdf47729ce7dd054a26eb534 "ALSA: pcm - Call pgprot_noncached() for ...
Message posted on the March 24th, 2011 - 5:20 PM ET
2.6.38 kernel breaks userspace bluetooth management tools
Hi; According to http://www.bluez.org/the-management-interface/ bluetooth management interface has changed in the 2.6.38 kernel and this ends up breaking bluetooth management tools (the ones that get your bluetooth mouse working) in both KDE & ...
Message posted on the March 19th, 2011 - 3:20 PM ET