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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

67
arch/um/sys-i386/ldt.c
View File

@@ -19,72 +19,6 @@
extern int modify_ldt(int func, void *ptr, unsigned long bytecount);
#ifdef CONFIG_MODE_TT
static long do_modify_ldt_tt(int func, void __user *ptr,
unsigned long bytecount)
{
struct user_desc info;
int res = 0;
void *buf = NULL;
void *p = NULL; /* What we pass to host. */
switch(func){
case 1:
case 0x11: /* write_ldt */
/* Do this check now to avoid overflows. */
if (bytecount != sizeof(struct user_desc)) {
res = -EINVAL;
goto out;
}
if(copy_from_user(&info, ptr, sizeof(info))) {
res = -EFAULT;
goto out;
}
p = &info;
break;
case 0:
case 2: /* read_ldt */
/* The use of info avoids kmalloc on the write case, not on the
* read one. */
buf = kmalloc(bytecount, GFP_KERNEL);
if (!buf) {
res = -ENOMEM;
goto out;
}
p = buf;
break;
default:
res = -ENOSYS;
goto out;
}
res = modify_ldt(func, p, bytecount);
if(res < 0)
goto out;
switch(func){
case 0:
case 2:
/* Modify_ldt was for reading and returned the number of read
* bytes.*/
if(copy_to_user(ptr, p, res))
res = -EFAULT;
break;
}
out:
kfree(buf);
return res;
}
#endif
#ifdef CONFIG_MODE_SKAS
#include "skas.h"
#include "skas_ptrace.h"
#include "asm/mmu_context.h"
@@ -569,7 +503,6 @@ void free_ldt(struct mmu_context_skas * mm)
}
mm->ldt.entry_count = 0;
}
#endif
int sys_modify_ldt(int func, void __user *ptr, unsigned long bytecount)
{