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, 36 deletions

diff --git a/arch/um/os-Linux/tls.c b/arch/um/os-Linux/tls.c
index 16215b990804..282bd25e19ef 100644
--- a/arch/um/os-Linux/tls.c
+++ b/arch/um/os-Linux/tls.c
@@ -8,11 +8,6 @@
 
 /* TLS support - we basically rely on the host's one.*/
 
-/* In TT mode, this should be called only by the tracing thread, and makes sense
- * only for PTRACE_SET_THREAD_AREA. In SKAS mode, it's used normally.
- *
- */
-
 #ifndef PTRACE_GET_THREAD_AREA
 #define PTRACE_GET_THREAD_AREA 25
 #endif
@@ -32,8 +27,6 @@ int os_set_thread_area(user_desc_t *info, int pid)
 	return ret;
 }
 
-#ifdef UML_CONFIG_MODE_SKAS
-
 int os_get_thread_area(user_desc_t *info, int pid)
 {
 	int ret;
@@ -44,32 +37,3 @@ int os_get_thread_area(user_desc_t *info, int pid)
 		ret = -errno;
 	return ret;
 }
-
-#endif
-
-#ifdef UML_CONFIG_MODE_TT
-#include "linux/unistd.h"
-
-int do_set_thread_area_tt(user_desc_t *info)
-{
-	int ret;
-
-	ret = syscall(__NR_set_thread_area,info);
-	if (ret < 0) {
-		ret = -errno;
-	}
-	return ret;
-}
-
-int do_get_thread_area_tt(user_desc_t *info)
-{
-	int ret;
-
-	ret = syscall(__NR_get_thread_area,info);
-	if (ret < 0) {
-		ret = -errno;
-	}
-	return ret;
-}
-
-#endif /* UML_CONFIG_MODE_TT */