uml: throw out CONFIG_MODE_TT

This patchset throws out tt mode, which has been non-functional for a while.

This is done in phases, interspersed with code cleanups on the affected files.

The removal is done as follows:
	remove all code, config options, and files which depend on
CONFIG_MODE_TT
	get rid of the CHOOSE_MODE macro, which decided whether to
call tt-mode or skas-mode code, and replace invocations with their
skas portions
	replace all now-trivial procedures with their skas equivalents

There are now a bunch of now-redundant pieces of data structures, including
mode-specific pieces of the thread structure, pt_regs, and mm_context.  These
are all replaced with their skas-specific contents.

As part of the ongoing style compliance project, I made a style pass over all
files that were changed.  There are three such patches, one for each phase,
covering the files affected by that phase but no later ones.

I noticed that we weren't freeing the LDT state associated with a process when
it exited, so that's fixed in one of the later patches.

The last patch is a tidying patch which I've had for a while, but which caused
inexplicable crashes under tt mode.  Since that is no longer a problem, this
can now go in.

This patch:

Start getting rid of tt mode support.

This patch throws out CONFIG_MODE_TT and all config options, code, and files
which depend on it.

CONFIG_MODE_SKAS is gone and everything that depends on it is included
unconditionally.

The few changed lines are in re-written Kconfig help, lines which needed
something skas-related removed from them, and a few more which weren't
strictly deletions.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 19 deletions

diff --git a/arch/um/os-Linux/time.c b/arch/um/os-Linux/time.c
index 5de169b168f..5eb32d24ba5 100644
--- a/arch/um/os-Linux/time.c
+++ b/arch/um/os-Linux/time.c
@@ -30,13 +30,6 @@ int set_interval(int is_virtual)
 	return 0;
 }
 
-#ifdef UML_CONFIG_MODE_TT
-void enable_timer(void)
-{
-	set_interval(1);
-}
-#endif
-
 void disable_timer(void)
 {
 	struct itimerval disable = ((struct itimerval) { { 0, 0 }, { 0, 0 }});
@@ -71,18 +64,6 @@ void switch_timers(int to_real)
 		       errno);
 }
 
-#ifdef UML_CONFIG_MODE_TT
-void uml_idle_timer(void)
-{
-	if(signal(SIGVTALRM, SIG_IGN) == SIG_ERR)
-		panic("Couldn't unset SIGVTALRM handler");
-
-	set_handler(SIGALRM, (__sighandler_t) alarm_handler,
-		    SA_RESTART, SIGUSR1, SIGIO, SIGWINCH, SIGVTALRM, -1);
-	set_interval(0);
-}
-#endif
-
 unsigned long long os_nsecs(void)
 {
 	struct timeval tv;