From: Arnd Bergmann
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
---
arch/sparc/Kconfig | 1 -
arch/sparc/include/asm/processor_64.h | 4
arch/sparc/include/asm/switch_to_64.h | 4 +---
arch/sparc/include/asm/thread_info_64.h | 4 +---
arch/sparc/include/asm/uaccess_64.h | 24
arch/sparc/kernel/process_64.c | 12
arch/sparc/kernel/traps_64.c| 2 --
arch/sparc/lib/NGmemcpy.S | 3 +--
arch/sparc/mm/init_64.c | 3 ---
9 files changed, 3 insertions(+), 54 deletions(-)
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 875388835a58..5f08e4d16ad8 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -99,7 +99,6 @@ config SPARC64
select HAVE_SETUP_PER_CPU_AREA
select NEED_PER_CPU_EMBED_FIRST_CHUNK
select NEED_PER_CPU_PAGE_FIRST_CHUNK
- select SET_FS
config ARCH_PROC_KCORE_TEXT
def_bool y
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
*/
__u8new_child;
- __u8current_ds;
+ __u8__pad;
__u16 cpu;
unsigned long *utraps;
@@ -81,7 +81,6 @@ struct thread_info {
#define TI_KREGS 0x0028
#define TI_PRE_COUNT 0x0030
#define TI_NEW_CHILD 0x0034
-#define TI_CURRENT_DS 0x0035
#define TI_CPU 0x0036
#define TI_UTRAPS 0x0038
#define TI_REG_WINDOW 0x0040
@@ -116,7 +115,6 @@ struct thread_info {
#define INIT_THREAD_INFO(tsk) \
{ \
.task = , \
- .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 000bac67cf31..617a462d1f56 100644
--- a/arch/sparc/include/asm/uaccess_64.h
+++ b/arch/sparc/include/asm/uaccess_64.h
@@ -13,24 +13,6 @@
#include
-/*
- * 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 }) /*
