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, 31 deletions

diff --git a/arch/um/os-Linux/process.c b/arch/um/os-Linux/process.c
index e9c143297512..d5fef4ce0112 100644
--- a/arch/um/os-Linux/process.c
+++ b/arch/um/os-Linux/process.c
@@ -133,13 +133,6 @@ void os_kill_ptraced_process(int pid, int reap_child)
                 CATCH_EINTR(waitpid(pid, NULL, 0));
 }
 
-#ifdef UML_CONFIG_MODE_TT
-void os_usr1_process(int pid)
-{
-        kill(pid, SIGUSR1);
-}
-#endif
-
 /* Don't use the glibc version, which caches the result in TLS. It misses some
  * syscalls, and also breaks with clone(), which does not unshare the TLS.
  */
@@ -239,30 +232,6 @@ out:
         return ok;
 }
 
-#ifdef UML_CONFIG_MODE_TT
-void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int))
-{
-        int flags = 0, pages;
-
-        if(sig_stack != NULL){
-                pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER);
-                set_sigstack(sig_stack, pages * UM_KERN_PAGE_SIZE);
-                flags = SA_ONSTACK;
-        }
-        if(usr1_handler){
-                struct sigaction sa;
-
-                sa.sa_handler = usr1_handler;
-                sigemptyset(&sa.sa_mask);
-                sa.sa_flags = flags;
-                sa.sa_restorer = NULL;
-                if(sigaction(SIGUSR1, &sa, NULL) < 0)
-                        panic("init_new_thread_stack - sigaction failed - "
-                              "errno = %d\n", errno);
-        }
-}
-#endif
-
 void init_new_thread_signals(void)
 {
         set_handler(SIGSEGV, (__sighandler_t) sig_handler, SA_ONSTACK,