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/sys-x86_64/syscalls.c b/arch/um/sys-x86_64/syscalls.c
index b3f6350cac44..d0ff832c9eaf 100644
--- a/arch/um/sys-x86_64/syscalls.c
+++ b/arch/um/sys-x86_64/syscalls.c
@@ -29,36 +29,6 @@ asmlinkage long sys_uname64(struct new_utsname __user * name)
         return err ? -EFAULT : 0;
 }
 
-#ifdef CONFIG_MODE_TT
-extern long arch_prctl(int code, unsigned long addr);
-
-static long arch_prctl_tt(int code, unsigned long addr)
-{
-        unsigned long tmp;
-        long ret;
-
-        switch(code){
-        case ARCH_SET_GS:
-        case ARCH_SET_FS:
-                ret = arch_prctl(code, addr);
-                break;
-        case ARCH_GET_FS:
-        case ARCH_GET_GS:
-                ret = arch_prctl(code, (unsigned long) &tmp);
-                if(!ret)
-                        ret = put_user(tmp, (long __user *)addr);
-                break;
-        default:
-                ret = -EINVAL;
-                break;
-        }
-
-        return(ret);
-}
-#endif
-
-#ifdef CONFIG_MODE_SKAS
-
 long arch_prctl_skas(struct task_struct *task, int code,
                      unsigned long __user *addr)
 {
@@ -119,7 +89,6 @@ long arch_prctl_skas(struct task_struct *task, int code,
 
         return ret;
 }
-#endif
 
 long sys_arch_prctl(int code, unsigned long addr)
 {