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, 58 deletions

diff --git a/arch/um/sys-i386/signal.c b/arch/um/sys-i386/signal.c
index 1cbf95f6858..187ea27536b 100644
--- a/arch/um/sys-i386/signal.c
+++ b/arch/um/sys-i386/signal.c
@@ -13,9 +13,6 @@
 #include "sigcontext.h"
 #include "registers.h"
 #include "mode.h"
-
-#ifdef CONFIG_MODE_SKAS
-
 #include "skas.h"
 
 void copy_sc(union uml_pt_regs *regs, void *from)
@@ -108,61 +105,6 @@ int copy_sc_to_user_skas(struct sigcontext __user *to, struct _fpstate __user *t
 	return copy_to_user(to, &sc, sizeof(sc)) ||
 	       copy_to_user(to_fp, fpregs, sizeof(fpregs));
 }
-#endif
-
-#ifdef CONFIG_MODE_TT
-
-/* These copy a sigcontext to/from userspace.  They copy the fpstate pointer,
- * blowing away the old, good one.  So, that value is saved, and then restored
- * after the sigcontext copy.  In copy_from, the variable holding the saved
- * fpstate pointer, and the sigcontext that it should be restored to are both
- * in the kernel, so we can just restore using an assignment.  In copy_to, the
- * saved pointer is in the kernel, but the sigcontext is in userspace, so we
- * copy_to_user it.
- */
-int copy_sc_from_user_tt(struct sigcontext *to, struct sigcontext __user *from,
-			 int fpsize)
-{
-	struct _fpstate *to_fp;
-	struct _fpstate __user *from_fp;
-	unsigned long sigs;
-	int err;
-
-	to_fp = to->fpstate;
-	sigs = to->oldmask;
-	err = copy_from_user(to, from, sizeof(*to));
-	from_fp = to->fpstate;
-	to->oldmask = sigs;
-	to->fpstate = to_fp;
-	if(to_fp != NULL)
-		err |= copy_from_user(to_fp, from_fp, fpsize);
-	return err;
-}
-
-int copy_sc_to_user_tt(struct sigcontext __user *to, struct _fpstate __user *fp,
-		       struct sigcontext *from, int fpsize, unsigned long sp)
-{
-	struct _fpstate __user *to_fp;
-	struct _fpstate *from_fp;
-	int err;
-
-	to_fp =	(fp ? fp : (struct _fpstate __user *) (to + 1));
-	from_fp = from->fpstate;
-	err = copy_to_user(to, from, sizeof(*to));
-
-	/* The SP in the sigcontext is the updated one for the signal
-	 * delivery.  The sp passed in is the original, and this needs
-	 * to be restored, so we stick it in separately.
-	 */
-	err |= copy_to_user(&SC_SP(to), &sp, sizeof(sp));
-
-	if(from_fp != NULL){
-		err |= copy_to_user(&to->fpstate, &to_fp, sizeof(to->fpstate));
-		err |= copy_to_user(to_fp, from_fp, fpsize);
-	}
-	return err;
-}
-#endif
 
 static int copy_sc_from_user(struct pt_regs *to, void __user *from)
 {