uml: remove code made redundant by CHOOSE_MODE removal

This patch makes a number of simplifications enabled by the removal of
CHOOSE_MODE.  There were lots of functions that looked like

	int foo(args){
		foo_skas(args);
	}

The bodies of foo_skas are now folded into foo, and their declarations (and
sometimes entire header files) are deleted.

In addition, the union uml_pt_regs, which was a union between the tt and skas
register formats, is now a struct, with the tt-mode arm of the union being
removed.

It turns out that usr2_handler was unused, so it is gone.

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>

6 files changed, 16 insertions, 67 deletions

diff --git a/include/asm-um/mmu_context.h b/include/asm-um/mmu_context.h
index a4186af..0c4a375 100644
--- a/include/asm-um/mmu_context.h
+++ b/include/asm-um/mmu_context.h
@@ -29,7 +29,7 @@ static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
 	 * possible.
 	 */
 	if (old != new && (current->flags & PF_BORROWED_MM))
-		switch_mm_skas(&new->context.skas.id);
+		__switch_mm(&new->context.skas.id);
 }
 
 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, 
@@ -41,7 +41,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 		cpu_clear(cpu, prev->cpu_vm_mask);
 		cpu_set(cpu, next->cpu_vm_mask);
 		if(next != &init_mm)
-			switch_mm_skas(&next->context.skas.id);
+			__switch_mm(&next->context.skas.id);
 	}
 }
 
@@ -50,21 +50,9 @@ static inline void enter_lazy_tlb(struct mm_struct *mm,
 {
 }
 
-extern int init_new_context_skas(struct task_struct *task, 
-				 struct mm_struct *mm);
+extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
 
-static inline int init_new_context(struct task_struct *task, 
-				   struct mm_struct *mm)
-{
-	return(init_new_context_skas(task, mm));
-}
-
-extern void destroy_context_skas(struct mm_struct *mm);
-
-static inline void destroy_context(struct mm_struct *mm)
-{
-	destroy_context_skas(mm);
-}
+extern void destroy_context(struct mm_struct *mm);
 
 #endif
 
diff --git a/include/asm-um/processor-generic.h b/include/asm-um/processor-generic.h
index be3ffec..126df73 100644
--- a/include/asm-um/processor-generic.h
+++ b/include/asm-um/processor-generic.h
@@ -32,12 +32,8 @@ struct thread_struct {
 	unsigned long temp_stack;
 	void *exec_buf;
 	struct arch_thread arch;
-	union {
-		struct {
-			jmp_buf switch_buf;
-			int mm_count;
-		} skas;
-	} mode;
+	jmp_buf switch_buf;
+	int mm_count;
 	struct {
 		int op;
 		union {
@@ -75,7 +71,10 @@ typedef struct {
 
 extern struct task_struct *alloc_task_struct(void);
 
-extern void release_thread(struct task_struct *);
+static inline void release_thread(struct task_struct *task)
+{
+}
+
 extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
 
 static inline void prepare_to_copy(struct task_struct *tsk)
@@ -125,8 +124,7 @@ extern struct cpuinfo_um cpu_data[];
 #endif
 
 
-#define KSTK_REG(tsk, reg) \
-	get_thread_reg(reg, &tsk->thread.mode.skas.switch_buf)
+#define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
 #define get_wchan(p) (0)
 
 #endif
diff --git a/include/asm-um/ptrace-generic.h b/include/asm-um/ptrace-generic.h
index 99c87c5..c8b3e6b 100644
--- a/include/asm-um/ptrace-generic.h
+++ b/include/asm-um/ptrace-generic.h
@@ -12,7 +12,7 @@
 #include "sysdep/ptrace.h"
 
 struct pt_regs {
-	union uml_pt_regs regs;
+	struct uml_pt_regs regs;
 };
 
 #define EMPTY_REGS { .regs = EMPTY_UML_PT_REGS }
@@ -44,7 +44,7 @@ extern int set_fpxregs(unsigned long buf, struct task_struct *tsk);
 
 extern void show_regs(struct pt_regs *regs);
 
-extern void send_sigtrap(struct task_struct *tsk, union uml_pt_regs *regs,
+extern void send_sigtrap(struct task_struct *tsk, struct uml_pt_regs *regs,
 			 int error_code);
 
 extern int arch_copy_tls(struct task_struct *new);
diff --git a/include/asm-um/ptrace-i386.h b/include/asm-um/ptrace-i386.h
index 4928a31..b733fa3 100644
--- a/include/asm-um/ptrace-i386.h
+++ b/include/asm-um/ptrace-i386.h
@@ -46,21 +46,4 @@ extern int ptrace_get_thread_area(struct task_struct *child, int idx,
 extern int ptrace_set_thread_area(struct task_struct *child, int idx,
                                   struct user_desc __user *user_desc);
 
-extern int do_set_thread_area_skas(struct user_desc *info);
-extern int do_get_thread_area_skas(struct user_desc *info);
-
-extern int do_set_thread_area_tt(struct user_desc *info);
-extern int do_get_thread_area_tt(struct user_desc *info);
-
-extern int arch_switch_tls_skas(struct task_struct *from, struct task_struct *to);
-extern int arch_switch_tls_tt(struct task_struct *from, struct task_struct *to);
-
-extern void arch_switch_to_tt(struct task_struct *from, struct task_struct *to);
-extern void arch_switch_to_skas(struct task_struct *from, struct task_struct *to);
-
-extern int do_get_thread_area_skas(struct user_desc *info);
-extern int do_set_thread_area_skas(struct user_desc *info);
-
-struct task_struct;
-
 #endif
diff --git a/include/asm-um/ptrace-x86_64.h b/include/asm-um/ptrace-x86_64.h
index bf61d17..4c47535 100644
--- a/include/asm-um/ptrace-x86_64.h
+++ b/include/asm-um/ptrace-x86_64.h
@@ -76,15 +76,6 @@ static inline int ptrace_set_thread_area(struct task_struct *child, int idx,
         return -ENOSYS;
 }
 
-static inline void arch_switch_to_tt(struct task_struct *from,
-                                     struct task_struct *to)
-{
-}
-
-extern void arch_switch_to_skas(struct task_struct *from,
-				struct task_struct *to);
-
-extern long arch_prctl_skas(struct task_struct *task, int code,
-			    unsigned long __user *addr);
-
+extern long arch_prctl(struct task_struct *task, int code,
+		       unsigned long __user *addr);
 #endif
diff --git a/include/asm-um/tlbflush.h b/include/asm-um/tlbflush.h
index 1520b08..9d647c5 100644
--- a/include/asm-um/tlbflush.h
+++ b/include/asm-um/tlbflush.h
@@ -24,18 +24,7 @@ extern void flush_tlb_all(void);
 extern void flush_tlb_mm(struct mm_struct *mm);
 extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, 
 			    unsigned long end);
-extern void flush_tlb_page_skas(struct vm_area_struct *vma,
-				unsigned long address);
-
-static inline void flush_tlb_page(struct vm_area_struct *vma,
-				  unsigned long address)
-{
-	address &= PAGE_MASK;
-
-	flush_tlb_page_skas(vma, address);
-}
-
-extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
+extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long address);
 extern void flush_tlb_kernel_vm(void);
 extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
 extern void __flush_tlb_one(unsigned long addr);