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s390/uaccess: simplify control register updates

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Always switch to the kernel ASCE in switch_mm. Load the secondary
space ASCE in finish_arch_post_lock_switch after checking that
any pending page table operations have completed. The primary
ASCE is loaded in entry[64].S. With this the update_primary_asce
call can be removed from the switch_to macro and from the start
of switch_mm function. Remove the load_primary argument from
update_user_asce/clear_user_asce, rename update_user_asce to
set_user_asce and rename update_primary_asce to load_kernel_asce.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2014-04-14 15:11:26 +02:00
parent f4192bf2dc
commit beef560b4c
8 changed files with 33 additions and 43 deletions
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10
arch/s390/lib/uaccess.c
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@@ -76,7 +76,7 @@ static inline unsigned long copy_from_user_mvcp(void *x, const void __user *ptr,
{
unsigned long tmp1, tmp2;
update_primary_asce(current);
load_kernel_asce();
tmp1 = -256UL;
asm volatile(
" sacf 0\n"
@@ -159,7 +159,7 @@ static inline unsigned long copy_to_user_mvcs(void __user *ptr, const void *x,
{
unsigned long tmp1, tmp2;
update_primary_asce(current);
load_kernel_asce();
tmp1 = -256UL;
asm volatile(
" sacf 0\n"
@@ -225,7 +225,7 @@ static inline unsigned long copy_in_user_mvc(void __user *to, const void __user
{
unsigned long tmp1;
update_primary_asce(current);
load_kernel_asce();
asm volatile(
" sacf 256\n"
" "AHI" %0,-1\n"
@@ -292,7 +292,7 @@ static inline unsigned long clear_user_xc(void __user *to, unsigned long size)
{
unsigned long tmp1, tmp2;
update_primary_asce(current);
load_kernel_asce();
asm volatile(
" sacf 256\n"
" "AHI" %0,-1\n"
@@ -358,7 +358,7 @@ unsigned long __strnlen_user(const char __user *src, unsigned long size)
{
if (unlikely(!size))
return 0;
update_primary_asce(current);
load_kernel_asce();
return strnlen_user_srst(src, size);
}
EXPORT_SYMBOL(__strnlen_user);