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s390/mm: cleanup arch_get_unmapped_area() and friends

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Factor out check_asce_limit() function and fix few style
defects in arch_get_unmapped_area() family of functions.

Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
[heiko.carstens@de.ibm.com: small coding style changes]
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Alexander Gordeev 2020-03-23 09:38:37 +01:00 committed by Vasily Gorbik
parent 194f75706b
commit 712fa5f294
3 changed files with 27 additions and 38 deletions
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14
arch/s390/include/asm/pgalloc.h
View file

@ -48,6 +48,20 @@ static inline unsigned long pgd_entry_type(struct mm_struct *mm)
int crst_table_upgrade(struct mm_struct *mm, unsigned long limit);
void crst_table_downgrade(struct mm_struct *);
static inline unsigned long check_asce_limit(struct mm_struct *mm, unsigned long addr,
unsigned long len)
{
int rc;
if (addr + len > mm->context.asce_limit &&
addr + len <= TASK_SIZE) {
rc = crst_table_upgrade(mm, addr + len);
if (rc)
return (unsigned long) rc;
}
return addr;
}
static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long address)
{
unsigned long *table = crst_table_alloc(mm);

11
arch/s390/mm/hugetlbpage.c
View file

@ -326,7 +326,6 @@ unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
struct hstate *h = hstate_file(file);
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
int rc;
if (len & ~huge_page_mask(h))
return -EINVAL;
@ -353,15 +352,9 @@ unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
else
addr = hugetlb_get_unmapped_area_topdown(file, addr, len,
pgoff, flags);
if (addr & ~PAGE_MASK)
if (offset_in_page(addr))
return addr;
check_asce_limit:
if (addr + len > current->mm->context.asce_limit &&
addr + len <= TASK_SIZE) {
rc = crst_table_upgrade(mm, addr + len);
if (rc)
return (unsigned long) rc;
}
return addr;
return check_asce_limit(mm, addr, len);
}

40
arch/s390/mm/mmap.c
View file

@ -72,14 +72,13 @@ static inline unsigned long mmap_base(unsigned long rnd,
return PAGE_ALIGN(STACK_TOP - gap - rnd);
}
unsigned long
arch_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff, unsigned long flags)
unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff,
unsigned long flags)
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
struct vm_unmapped_area_info info;
int rc;
if (len > TASK_SIZE - mmap_min_addr)
return -ENOMEM;
@ -105,30 +104,20 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
info.align_mask = 0;
info.align_offset = pgoff << PAGE_SHIFT;
addr = vm_unmapped_area(&info);
if (addr & ~PAGE_MASK)
if (offset_in_page(addr))
return addr;
check_asce_limit:
if (addr + len > current->mm->context.asce_limit &&
addr + len <= TASK_SIZE) {
rc = crst_table_upgrade(mm, addr + len);
if (rc)
return (unsigned long) rc;
}
return addr;
return check_asce_limit(mm, addr, len);
}
unsigned long
arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
const unsigned long len, const unsigned long pgoff,
const unsigned long flags)
unsigned long arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
unsigned long len, unsigned long pgoff,
unsigned long flags)
{
struct vm_area_struct *vma;
struct mm_struct *mm = current->mm;
unsigned long addr = addr0;
struct vm_unmapped_area_info info;
int rc;
/* requested length too big for entire address space */
if (len > TASK_SIZE - mmap_min_addr)
@ -163,25 +152,18 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
* can happen with large stack limits and large mmap()
* allocations.
*/
if (addr & ~PAGE_MASK) {
if (offset_in_page(addr)) {
VM_BUG_ON(addr != -ENOMEM);
info.flags = 0;
info.low_limit = TASK_UNMAPPED_BASE;
info.high_limit = TASK_SIZE;
addr = vm_unmapped_area(&info);
if (addr & ~PAGE_MASK)
if (offset_in_page(addr))
return addr;
}
check_asce_limit:
if (addr + len > current->mm->context.asce_limit &&
addr + len <= TASK_SIZE) {
rc = crst_table_upgrade(mm, addr + len);
if (rc)
return (unsigned long) rc;
}
return addr;
return check_asce_limit(mm, addr, len);
}
/*