sparc64: remove CONFIG_SET_FS support

sparc64 uses address space identifiers to differentiate between kernel
and user space, using ASI_P for kernel threads but ASI_AIUS for normal
user space, with the option of changing between them.

As nothing really changes the ASI any more, just hardcode ASI_AIUS
everywhere. Kernel threads are not allowed to access __user pointers
anyway.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

4 files changed, 3 insertions, 29 deletions

diff --git a/arch/sparc/include/asm/processor_64.h b/arch/sparc/include/asm/processor_64.h
index ae851e8fce4c..89850dff6b03 100644
--- a/arch/sparc/include/asm/processor_64.h
+++ b/arch/sparc/include/asm/processor_64.h
@@ -47,10 +47,6 @@
 
 #ifndef __ASSEMBLY__
 
-typedef struct {
-	unsigned char seg;
-} mm_segment_t;
-
 /* The Sparc processor specific thread struct. */
 /* XXX This should die, everything can go into thread_info now. */
 struct thread_struct {
diff --git a/arch/sparc/include/asm/switch_to_64.h b/arch/sparc/include/asm/switch_to_64.h
index b1d4e2e3210f..14f3c49bfdbc 100644
--- a/arch/sparc/include/asm/switch_to_64.h
+++ b/arch/sparc/include/asm/switch_to_64.h
@@ -20,10 +20,8 @@ do {						\
 	 */
 #define switch_to(prev, next, last)					\
 do {	save_and_clear_fpu();						\
-	/* If you are tempted to conditionalize the following */	\
-	/* so that ASI is only written if it changes, think again. */	\
 	__asm__ __volatile__("wr %%g0, %0, %%asi"			\
-	: : "r" (task_thread_info(next)->current_ds));\
+	: : "r" (ASI_AIUS));						\
 	trap_block[current_thread_info()->cpu].thread =			\
 		task_thread_info(next);					\
 	__asm__ __volatile__(						\
diff --git a/arch/sparc/include/asm/thread_info_64.h b/arch/sparc/include/asm/thread_info_64.h
index 8047a9caab2f..1a44372e2bc0 100644
--- a/arch/sparc/include/asm/thread_info_64.h
+++ b/arch/sparc/include/asm/thread_info_64.h
@@ -46,7 +46,7 @@ struct thread_info {
 	struct pt_regs		*kregs;
 	int			preempt_count;	/* 0 => preemptable, <0 => BUG */
 	__u8			new_child;
-	__u8			current_ds;
+	__u8			__pad;
 	__u16			cpu;
 
 	unsigned long		*utraps;
@@ -81,7 +81,6 @@ struct thread_info {
 #define TI_KREGS	0x00000028
 #define TI_PRE_COUNT	0x00000030
 #define TI_NEW_CHILD	0x00000034
-#define TI_CURRENT_DS	0x00000035
 #define TI_CPU		0x00000036
 #define TI_UTRAPS	0x00000038
 #define TI_REG_WINDOW	0x00000040
@@ -116,7 +115,6 @@ struct thread_info {
 #define INIT_THREAD_INFO(tsk)				\
 {							\
 	.task		=	&tsk,			\
-	.current_ds	=	ASI_P,			\
 	.preempt_count	=	INIT_PREEMPT_COUNT,	\
 	.kregs		=	(struct pt_regs *)(init_stack+THREAD_SIZE)-1 \
 }
diff --git a/arch/sparc/include/asm/uaccess_64.h b/arch/sparc/include/asm/uaccess_64.h
index 59b9a545df23..94266a5c5b04 100644
--- a/arch/sparc/include/asm/uaccess_64.h
+++ b/arch/sparc/include/asm/uaccess_64.h
@@ -12,33 +12,15 @@
 #include <asm/spitfire.h>
 
 #include <asm/processor.h>
+#include <asm-generic/access_ok.h>
 
 /*
  * Sparc64 is segmented, though more like the M68K than the I386.
  * We use the secondary ASI to address user memory, which references a
  * completely different VM map, thus there is zero chance of the user
  * doing something queer and tricking us into poking kernel memory.
- *
- * What is left here is basically what is needed for the other parts of
- * the kernel that expect to be able to manipulate, erum, "segments".
- * Or perhaps more properly, permissions.
- *
- * "For historical reasons, these macros are grossly misnamed." -Linus
  */
 
-#define KERNEL_DS   ((mm_segment_t) { ASI_P })
-#define USER_DS     ((mm_segment_t) { ASI_AIUS })	/* har har har */
-
-#define get_fs() ((mm_segment_t){(current_thread_info()->current_ds)})
-
-#include <asm-generic/access_ok.h>
-
-#define set_fs(val)								\
-do {										\
-	current_thread_info()->current_ds = (val).seg;				\
-	__asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg));	\
-} while(0)
-
 /*
  * Test whether a block of memory is a valid user space address.
  * Returns 0 if the range is valid, nonzero otherwise.