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, 24 deletions

diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
index cf0dd9cf8c43..ec1ed680032b 100644
--- a/arch/um/kernel/irq.c
+++ b/arch/um/kernel/irq.c
@@ -339,30 +339,6 @@ int deactivate_all_fds(void)
         return 0;
 }
 
-#ifdef CONFIG_MODE_TT
-void forward_interrupts(int pid)
-{
-        struct irq_fd *irq;
-        unsigned long flags;
-        int err;
-
-        spin_lock_irqsave(&irq_lock, flags);
-        for (irq = active_fds; irq != NULL; irq = irq->next) {
-                err = os_set_owner(irq->fd, pid);
-                if (err < 0) {
-                        /* XXX Just remove the irq rather than
-                         * print out an infinite stream of these
-                         */
-                        printk("Failed to forward %d to pid %d, err = %d\n",
-                               irq->fd, pid, -err);
-                }
-
-                irq->pid = pid;
-        }
-        spin_unlock_irqrestore(&irq_lock, flags);
-}
-#endif
-
 /*
  * do_IRQ handles all normal device IRQ's (the special
  * SMP cross-CPU interrupts have their own specific