forked from luck/tmp_suning_uos_patched
s390/mm: cleanup arch_get_unmapped_area() and friends
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>
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@ -48,6 +48,20 @@ static inline unsigned long pgd_entry_type(struct mm_struct *mm)
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int crst_table_upgrade(struct mm_struct *mm, unsigned long limit);
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void crst_table_downgrade(struct mm_struct *);
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static inline unsigned long check_asce_limit(struct mm_struct *mm, unsigned long addr,
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unsigned long len)
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{
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int rc;
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if (addr + len > mm->context.asce_limit &&
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addr + len <= TASK_SIZE) {
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rc = crst_table_upgrade(mm, addr + len);
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if (rc)
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return (unsigned long) rc;
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}
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return addr;
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}
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static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long address)
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{
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unsigned long *table = crst_table_alloc(mm);
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@ -326,7 +326,6 @@ unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
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struct hstate *h = hstate_file(file);
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma;
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int rc;
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if (len & ~huge_page_mask(h))
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return -EINVAL;
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@ -353,15 +352,9 @@ unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
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else
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addr = hugetlb_get_unmapped_area_topdown(file, addr, len,
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pgoff, flags);
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if (addr & ~PAGE_MASK)
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if (offset_in_page(addr))
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return addr;
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check_asce_limit:
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if (addr + len > current->mm->context.asce_limit &&
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addr + len <= TASK_SIZE) {
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rc = crst_table_upgrade(mm, addr + len);
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if (rc)
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return (unsigned long) rc;
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}
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return addr;
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return check_asce_limit(mm, addr, len);
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}
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@ -72,14 +72,13 @@ static inline unsigned long mmap_base(unsigned long rnd,
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return PAGE_ALIGN(STACK_TOP - gap - rnd);
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}
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unsigned long
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arch_get_unmapped_area(struct file *filp, unsigned long addr,
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unsigned long len, unsigned long pgoff, unsigned long flags)
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unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
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unsigned long len, unsigned long pgoff,
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unsigned long flags)
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{
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma;
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struct vm_unmapped_area_info info;
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int rc;
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if (len > TASK_SIZE - mmap_min_addr)
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return -ENOMEM;
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@ -105,30 +104,20 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
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info.align_mask = 0;
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info.align_offset = pgoff << PAGE_SHIFT;
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addr = vm_unmapped_area(&info);
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if (addr & ~PAGE_MASK)
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if (offset_in_page(addr))
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return addr;
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check_asce_limit:
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if (addr + len > current->mm->context.asce_limit &&
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addr + len <= TASK_SIZE) {
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rc = crst_table_upgrade(mm, addr + len);
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if (rc)
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return (unsigned long) rc;
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}
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return addr;
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return check_asce_limit(mm, addr, len);
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}
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unsigned long
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arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
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const unsigned long len, const unsigned long pgoff,
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const unsigned long flags)
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unsigned long arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
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unsigned long len, unsigned long pgoff,
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unsigned long flags)
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{
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struct vm_area_struct *vma;
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struct mm_struct *mm = current->mm;
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unsigned long addr = addr0;
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struct vm_unmapped_area_info info;
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int rc;
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/* requested length too big for entire address space */
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if (len > TASK_SIZE - mmap_min_addr)
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@ -163,25 +152,18 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
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* can happen with large stack limits and large mmap()
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* allocations.
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*/
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if (addr & ~PAGE_MASK) {
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if (offset_in_page(addr)) {
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VM_BUG_ON(addr != -ENOMEM);
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info.flags = 0;
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info.low_limit = TASK_UNMAPPED_BASE;
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info.high_limit = TASK_SIZE;
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addr = vm_unmapped_area(&info);
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if (addr & ~PAGE_MASK)
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if (offset_in_page(addr))
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return addr;
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}
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check_asce_limit:
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if (addr + len > current->mm->context.asce_limit &&
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addr + len <= TASK_SIZE) {
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rc = crst_table_upgrade(mm, addr + len);
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if (rc)
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return (unsigned long) rc;
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}
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return addr;
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return check_asce_limit(mm, addr, len);
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}
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/*
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