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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2013-10-28 14:48:30 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-11-04 13:51:47 +0100
commit106078641f32a6a10d9759f809f809725695cb09 (patch)
treea65201fd31994348a067c63e820530ad15387476 /arch/s390/mm/mmap.c
parentbe39f1968e33ca641af120a2d659421ad2225dea (diff)
downloadop-kernel-dev-106078641f32a6a10d9759f809f809725695cb09.zip
op-kernel-dev-106078641f32a6a10d9759f809f809725695cb09.tar.gz
s390/mm,tlb: correct tlb flush on page table upgrade
The IDTE instruction used to flush TLB entries for a specific address space uses the address-space-control element (ASCE) to identify affected TLB entries. The upgrade of a page table adds a new top level page table which changes the ASCE. The TLB entries associated with the old ASCE need to be flushed and the ASCE for the address space needs to be replaced synchronously on all CPUs which currently use it. The concept of a lazy ASCE update with an exception handler is broken. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm/mmap.c')
-rw-r--r--arch/s390/mm/mmap.c12
1 files changed, 2 insertions, 10 deletions
diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
index 4002329..6bcb045 100644
--- a/arch/s390/mm/mmap.c
+++ b/arch/s390/mm/mmap.c
@@ -101,18 +101,12 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
int s390_mmap_check(unsigned long addr, unsigned long len, unsigned long flags)
{
- int rc;
-
if (is_compat_task() || (TASK_SIZE >= (1UL << 53)))
return 0;
if (!(flags & MAP_FIXED))
addr = 0;
- if ((addr + len) >= TASK_SIZE) {
- rc = crst_table_upgrade(current->mm, 1UL << 53);
- if (rc)
- return rc;
- update_mm(current->mm, current);
- }
+ if ((addr + len) >= TASK_SIZE)
+ return crst_table_upgrade(current->mm, 1UL << 53);
return 0;
}
@@ -132,7 +126,6 @@ s390_get_unmapped_area(struct file *filp, unsigned long addr,
rc = crst_table_upgrade(mm, 1UL << 53);
if (rc)
return (unsigned long) rc;
- update_mm(mm, current);
area = arch_get_unmapped_area(filp, addr, len, pgoff, flags);
}
return area;
@@ -155,7 +148,6 @@ s390_get_unmapped_area_topdown(struct file *filp, const unsigned long addr,
rc = crst_table_upgrade(mm, 1UL << 53);
if (rc)
return (unsigned long) rc;
- update_mm(mm, current);
area = arch_get_unmapped_area_topdown(filp, addr, len,
pgoff, flags);
}
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