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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2013-09-24 09:14:56 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-10-24 17:16:57 +0200
commite258d719ff28ecc7a048eb8f78380e68c4b3a3f0 (patch)
tree1c7f496b97cef1111b230371940e603a2ca401a4 /arch/s390/mm
parent7d7c7b24e416afb2637be8447e03ca4457c100fd (diff)
downloadop-kernel-dev-e258d719ff28ecc7a048eb8f78380e68c4b3a3f0.zip
op-kernel-dev-e258d719ff28ecc7a048eb8f78380e68c4b3a3f0.tar.gz
s390/uaccess: always run the kernel in home space
Simplify the uaccess code by removing the user_mode=home option. The kernel will now always run in the home space mode. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm')
-rw-r--r--arch/s390/mm/fault.c9
-rw-r--r--arch/s390/mm/pgtable.c4
2 files changed, 2 insertions, 11 deletions
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index fc66792..8f29762 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -115,13 +115,8 @@ static inline int user_space_fault(unsigned long trans_exc_code)
if (trans_exc_code == 2)
/* Access via secondary space, set_fs setting decides */
return current->thread.mm_segment.ar4;
- if (s390_user_mode == HOME_SPACE_MODE)
- /* User space if the access has been done via home space. */
- return trans_exc_code == 3;
/*
- * If the user space is not the home space the kernel runs in home
- * space. Access via secondary space has already been covered,
- * access via primary space or access register is from user space
+ * Access via primary space or access register is from user space
* and access via home space is from the kernel.
*/
return trans_exc_code != 3;
@@ -471,7 +466,7 @@ int __handle_fault(unsigned long uaddr, unsigned long pgm_int_code, int write)
int access, fault;
/* Emulate a uaccess fault from kernel mode. */
- regs.psw.mask = psw_kernel_bits | PSW_MASK_DAT | PSW_MASK_MCHECK;
+ regs.psw.mask = PSW_KERNEL_BITS | PSW_MASK_DAT | PSW_MASK_MCHECK;
if (!irqs_disabled())
regs.psw.mask |= PSW_MASK_IO | PSW_MASK_EXT;
regs.psw.addr = (unsigned long) __builtin_return_address(0);
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index de8cbc3..94f37a9 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -1157,10 +1157,6 @@ int s390_enable_sie(void)
struct mm_struct *mm = tsk->mm;
struct mmu_gather tlb;
- /* Do we have switched amode? If no, we cannot do sie */
- if (s390_user_mode == HOME_SPACE_MODE)
- return -EINVAL;
-
/* Do we have pgstes? if yes, we are done */
if (mm_has_pgste(tsk->mm))
return 0;
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