linux-toradex.git/arch/um/os-Linux/main.c, branch v5.0 Linux kernel for Apalis and Colibri modules um: remove uml initcalls 2018-06-10T20:49:14+00:00 Alexander Pateenok pateenoc@gmail.com 2018-04-23T18:20:17+00:00 cca76c1ad61d08097af5a691195f9a42d72e978f __uml_initcall() is not used and .uml.initcall.init section is empty: $ grep -r '__uml_initcall(' arch/um/include/shared/init.h:#define __uml_initcall(fn) \ $ readelf -s ../umobj/linux | grep __uml_initcall 23214: 00000000603b75d8 0 NOTYPE GLOBAL DEFAULT 32 __uml_initcall_start 25337: 00000000603b75d8 0 NOTYPE GLOBAL DEFAULT 32 __uml_initcall_end So it is unnecessary. Signed-off-by: Alexander Pateenok <pateenoc@gmail.com> Signed-off-by: Richard Weinberger <richard@nod.at> 
__uml_initcall() is not used and .uml.initcall.init section is empty:

$ grep -r '__uml_initcall('
arch/um/include/shared/init.h:#define __uml_initcall(fn)	\
$ readelf -s ../umobj/linux | grep __uml_initcall
 23214: 00000000603b75d8     0 NOTYPE  GLOBAL DEFAULT   32 __uml_initcall_start
 25337: 00000000603b75d8     0 NOTYPE  GLOBAL DEFAULT   32 __uml_initcall_end

So it is unnecessary.

Signed-off-by: Alexander Pateenok <pateenoc@gmail.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
um: Use os_warn to print out pre-boot warning/error messages 2017-07-05T21:18:25+00:00 Masami Hiramatsu mhiramat@kernel.org 2017-05-17T17:19:31+00:00 0936d4f3d5a3d5daf453bc341f02ba4e68cfe40e Use os_warn() instead of printf/fprintf to print out pre-boot warning/error messages to stderr. Note that the help message and version message are kept to print out to stdout, because user explicitly specifies those options to get such information. Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Richard Weinberger <richard@nod.at> 
Use os_warn() instead of printf/fprintf to print out
pre-boot warning/error messages to stderr.
Note that the help message and version message are
kept to print out to stdout, because user explicitly
specifies those options to get such information.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Richard Weinberger <richard@nod.at>
um: Use os_info for the messages on normal path 2017-07-05T21:17:42+00:00 Masami Hiramatsu mhiramat@kernel.org 2017-05-17T17:17:14+00:00 d3878bb8003009d148cd787e1a2d74cff914a7b2 Use os_info() for printing out the messages on the normal execution path. Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Richard Weinberger <richard@nod.at> 
Use os_info() for printing out the messages on the
normal execution path.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Richard Weinberger <richard@nod.at>
um: Switch clocksource to hrtimers 2015-11-06T21:54:49+00:00 Anton Ivanov aivanov@brocade.com 2015-11-02T16:16:37+00:00 2eb5f31bc4ea24bb293e82934cfa1cce9573304b UML is using an obsolete itimer call for all timers and "polls" for kernel space timer firing in its userspace portion resulting in a long list of bugs and incorrect behaviour(s). It also uses ITIMER_VIRTUAL for its timer which results in the timer being dependent on it running and the cpu load. This patch fixes this by moving to posix high resolution timers firing off CLOCK_MONOTONIC and relaying the timer correctly to the UML userspace. Fixes: - crashes when hosts suspends/resumes - broken userspace timers - effecive ~40Hz instead of what they should be. Note - this modifies skas behavior by no longer setting an itimer per clone(). Timer events are relayed instead. - kernel network packet scheduling disciplines - tcp behaviour especially under load - various timer related corner cases Finally, overall responsiveness of userspace is better. Signed-off-by: Thomas Meyer <thomas@m3y3r.de> Signed-off-by: Anton Ivanov <aivanov@brocade.com> [rw: massaged commit message] Signed-off-by: Richard Weinberger <richard@nod.at> 
UML is using an obsolete itimer call for
all timers and "polls" for kernel space timer firing
in its userspace portion resulting in a long list
of bugs and incorrect behaviour(s). It also uses
ITIMER_VIRTUAL for its timer which results in the
timer being dependent on it running and the cpu
load.

This patch fixes this by moving to posix high resolution
timers firing off CLOCK_MONOTONIC and relaying the timer
correctly to the UML userspace.

Fixes:
 - crashes when hosts suspends/resumes
 - broken userspace timers - effecive ~40Hz instead
   of what they should be. Note - this modifies skas behavior
   by no longer setting an itimer per clone(). Timer events
   are relayed instead.
 - kernel network packet scheduling disciplines
 - tcp behaviour especially under load
 - various timer related corner cases

Finally, overall responsiveness of userspace is better.

Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: Anton Ivanov <aivanov@brocade.com>
[rw: massaged commit message]
Signed-off-by: Richard Weinberger <richard@nod.at>
um: Missing pipe handling 2014-04-20T21:13:30+00:00 Anton Ivanov antivano@cisco.com 2014-03-07T18:37:46+00:00 9fcb663be42e4727c1beabc7c80e2d839199e6b1 UML does not handle sigpipe. As a result when running it under expect or redirecting the IO from the console to an external program it will crash if the program stops or exits. Signed-off-by: Anton Ivanov <antivano@cisco.com> Signed-off-by: Richard Weinberger <richard@nod.at> 
UML does not handle sigpipe. As a result when running it under
expect or redirecting the IO from the console to an external program
it will crash if the program stops or exits.

Signed-off-by: Anton Ivanov <antivano@cisco.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
um: Run UML in it's own session. 2013-09-07T08:57:07+00:00 Richard Weinberger richard@nod.at 2013-08-18T11:30:09+00:00 250127216dd6635f5730752d7444bdec992aecb0 If UML is not run by a shell it can happen that UML will kill unrelated proceses upon a fatal exit because it issues a kill(0, ...). To prevent such oddities we create a new session in main(). Reported-and-tested-by: Richard W.M. Jones <rjones@redhat.com> Signed-off-by: Richard Weinberger <richard@nod.at> 
If UML is not run by a shell it can happen that UML
will kill unrelated proceses upon a fatal exit because
it issues a kill(0, ...).
To prevent such oddities we create a new session in main().

Reported-and-tested-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
um: get rid of pointless include "..." where include <...> will do 2012-10-09T20:28:45+00:00 Al Viro viro@ZenIV.linux.org.uk 2012-10-08T02:27:32+00:00 37185b33240870719b6b5913a46e6a441f1ae96f Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at> 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
um: -include user.h for USER_OBJ, trim includes 2011-11-02T13:14:44+00:00 Al Viro viro@ftp.linux.org.uk 2011-08-18T19:01:29+00:00 078073a3d48ce7c140f1538d249da3ac545065a6 Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Richard Weinberger <richard@nod.at> 
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
um: disable scan_elf_aux() on x86_64 2011-07-26T03:57:13+00:00 Richard Weinberger richard@nod.at 2011-07-26T00:12:52+00:00 b743ac54e54ca18fb7164a97cc77cf1ccee0b0f7 Reusing the host's vDSO makes only sense on x86_32. Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> 
Reusing the host's vDSO makes only sense on x86_32.

Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
um: remove SIGHUP handler 2011-05-25T15:39:40+00:00 Richard Weinberger richard@nod.at 2011-05-25T00:13:00+00:00 2525e70d492f8c7bbe1292db8fcd973607a56ac6 The UML kernel ignores SIGHUP anyway. This handler is in vain. Signed-off-by: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> 
The UML kernel ignores SIGHUP anyway.  This handler is in vain.

Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>