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uml: throw out CONFIG_MODE_TT

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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>
This commit is contained in:
Jeff Dike
2007-10-16 01:26:50 -07:00
committed by Linus Torvalds
parent a1ff5878d2
commit 42fda66387
87 changed files with 34 additions and 4203 deletions
Download Patch File Download Diff File Expand all files Collapse all files

58
arch/um/sys-i386/signal.c
View File

@@ -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)
{