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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 <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jeff Dike 2007-10-16 01:26:50 -07:00 • committed by Linus Torvalds
commit 42fda66387
87 changed files with 34 additions and 4203 deletions
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6
include/asm-um/mmu_context.h
View file

@ -56,12 +56,6 @@ static inline void enter_lazy_tlb(struct mm_struct *mm,
extern int init_new_context_skas(struct task_struct *task,
struct mm_struct *mm);
static inline int init_new_context_tt(struct task_struct *task,
struct mm_struct *mm)
{
return(0);
}
static inline int init_new_context(struct task_struct *task,
struct mm_struct *mm)
{

14
include/asm-um/processor-generic.h
View file

@ -34,20 +34,10 @@ struct thread_struct {
void *exec_buf;
struct arch_thread arch;
union {
#ifdef CONFIG_MODE_TT
struct {
int extern_pid;
int tracing;
int switch_pipe[2];
int vm_seq;
} tt;
#endif
#ifdef CONFIG_MODE_SKAS
struct {
jmp_buf switch_buf;
int mm_count;
} skas;
#endif
} mode;
struct {
int op;
@ -136,12 +126,8 @@ extern struct cpuinfo_um cpu_data[];
#endif
#ifdef CONFIG_MODE_SKAS
#define KSTK_REG(tsk, reg) \
get_thread_reg(reg, &tsk->thread.mode.skas.switch_buf)
#else
#define KSTK_REG(tsk, reg) (0xbadbabe)
#endif
#define get_wchan(p) (0)
#endif