aboutsummaryrefslogtreecommitdiff
path: root/arch/s390/mm
diff options
context:
space:
mode:
authorMartin Schwidefsky <schwidefsky@de.ibm.com>2009-12-07 12:51:43 +0100
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2009-12-07 12:51:33 +0100
commitb11b53342773361f3353b285eb6a3fd6074e7997 (patch)
treeb7fda314933b82d39cb8d30c7882ca3044dd0367 /arch/s390/mm
parent61365e132ef987f7719af5d2e434db4465957637 (diff)
downloadlinux-linaro-android-b11b53342773361f3353b285eb6a3fd6074e7997.tar.gz
[S390] Improve address space mode selection.
Introduce user_mode to replace the two variables switch_amode and s390_noexec. There are three valid combinations of the old values: 1) switch_amode == 0 && s390_noexec == 0 2) switch_amode == 1 && s390_noexec == 0 3) switch_amode == 1 && s390_noexec == 1 They get replaced by 1) user_mode == HOME_SPACE_MODE 2) user_mode == PRIMARY_SPACE_MODE 3) user_mode == SECONDARY_SPACE_MODE The new kernel parameter user_mode=[primary,secondary,home] lets you choose the address space mode the user space processes should use. In addition the CONFIG_S390_SWITCH_AMODE config option is removed. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm')
-rw-r--r--arch/s390/mm/fault.c4
-rw-r--r--arch/s390/mm/pgtable.c2
2 files changed, 3 insertions, 3 deletions
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 3df5b918cfe..77108e34fc1 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -112,7 +112,7 @@ 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 (!switch_amode)
+ if (user_mode == HOME_SPACE_MODE)
/* User space if the access has been done via home space. */
return trans_exc_code == 3;
/*
@@ -168,7 +168,7 @@ static void do_no_context(struct pt_regs *regs, unsigned long error_code,
* terminate things with extreme prejudice.
*/
address = trans_exc_code & __FAIL_ADDR_MASK;
- if (user_space_fault(trans_exc_code) == 0)
+ if (!user_space_fault(trans_exc_code))
printk(KERN_ALERT "Unable to handle kernel pointer dereference"
" at virtual kernel address %p\n", (void *)address);
else
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 2757c5616a0..ad621e06ada 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -269,7 +269,7 @@ int s390_enable_sie(void)
struct mm_struct *mm, *old_mm;
/* Do we have switched amode? If no, we cannot do sie */
- if (!switch_amode)
+ if (user_mode == HOME_SPACE_MODE)
return -EINVAL;
/* Do we have pgstes? if yes, we are done */