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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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4
arch/s390/include/asm/futex.h
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@@ -29,7 +29,7 @@ static inline int futex_atomic_op_inuser(int encoded_op, u32 __user *uaddr)
int cmparg = (encoded_op << 20) >> 20;
int oldval = 0, newval, ret;
update_primary_asce(current);
load_kernel_asce();
if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
oparg = 1 << oparg;
@@ -79,7 +79,7 @@ static inline int futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
{
int ret;
update_primary_asce(current);
load_kernel_asce();
asm volatile(
" sacf 256\n"
"0: cs %1,%4,0(%5)\n"