[S390] make page table upgrade work again
After TASK_SIZE now gives the current size of the address space the
upgrade of a 64 bit process from 3 to 4 levels of page table needs
to use the arch_mmap_check hook to catch large mmap lengths. The
get_unmapped_area* functions need to check for -ENOMEM from the
arch_get_unmapped_area*, upgrade the page table and retry.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/mm/mmap.c b/arch/s390/mm/mmap.c
index 346dd0c..e008d23 100644
--- a/arch/s390/mm/mmap.c
+++ b/arch/s390/mm/mmap.c
@@ -89,42 +89,58 @@
#else
+int s390_mmap_check(unsigned long addr, unsigned long len)
+{
+ if (!test_thread_flag(TIF_31BIT) &&
+ len >= TASK_SIZE && TASK_SIZE < (1UL << 53))
+ return crst_table_upgrade(current->mm, 1UL << 53);
+ return 0;
+}
+
static unsigned long
s390_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff, unsigned long flags)
{
struct mm_struct *mm = current->mm;
+ unsigned long area;
int rc;
- addr = arch_get_unmapped_area(filp, addr, len, pgoff, flags);
- if (addr & ~PAGE_MASK)
- return addr;
- if (unlikely(mm->context.asce_limit < addr + len)) {
- rc = crst_table_upgrade(mm, addr + len);
+ area = arch_get_unmapped_area(filp, addr, len, pgoff, flags);
+ if (!(area & ~PAGE_MASK))
+ return area;
+ if (area == -ENOMEM &&
+ !test_thread_flag(TIF_31BIT) && TASK_SIZE < (1UL << 53)) {
+ /* Upgrade the page table to 4 levels and retry. */
+ rc = crst_table_upgrade(mm, 1UL << 53);
if (rc)
return (unsigned long) rc;
+ area = arch_get_unmapped_area(filp, addr, len, pgoff, flags);
}
- return addr;
+ return area;
}
static unsigned long
-s390_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
+s390_get_unmapped_area_topdown(struct file *filp, const unsigned long addr,
const unsigned long len, const unsigned long pgoff,
const unsigned long flags)
{
struct mm_struct *mm = current->mm;
- unsigned long addr = addr0;
+ unsigned long area;
int rc;
- addr = arch_get_unmapped_area_topdown(filp, addr, len, pgoff, flags);
- if (addr & ~PAGE_MASK)
- return addr;
- if (unlikely(mm->context.asce_limit < addr + len)) {
- rc = crst_table_upgrade(mm, addr + len);
+ area = arch_get_unmapped_area_topdown(filp, addr, len, pgoff, flags);
+ if (!(area & ~PAGE_MASK))
+ return area;
+ if (area == -ENOMEM &&
+ !test_thread_flag(TIF_31BIT) && TASK_SIZE < (1UL << 53)) {
+ /* Upgrade the page table to 4 levels and retry. */
+ rc = crst_table_upgrade(mm, 1UL << 53);
if (rc)
return (unsigned long) rc;
+ area = arch_get_unmapped_area_topdown(filp, addr, len,
+ pgoff, flags);
}
- return addr;
+ return area;
}
/*
* This function, called very early during the creation of a new