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author | 2014-04-14 15:11:26 +0200 | |
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committer | 2014-05-20 08:58:46 +0200 | |
commit | beef560b4cdfafb2211a856e1d722540f5151933 (patch) | |
tree | 7ded8bd3d03266371d68d74d2d96ce8728c2390d /arch/s390/lib | |
parent | s390/smp: Avoid busy loop after halt and "begin" on z/VM (diff) | |
download | linux-beef560b4cdfafb2211a856e1d722540f5151933.tar.gz linux-beef560b4cdfafb2211a856e1d722540f5151933.tar.bz2 linux-beef560b4cdfafb2211a856e1d722540f5151933.zip |
s390/uaccess: simplify control register updates
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>
Diffstat (limited to 'arch/s390/lib')
-rw-r--r-- | arch/s390/lib/uaccess.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/s390/lib/uaccess.c b/arch/s390/lib/uaccess.c index 7416efe8eae4..53dd5d7a0c96 100644 --- a/arch/s390/lib/uaccess.c +++ b/arch/s390/lib/uaccess.c @@ -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); |