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be77e999e3
We don't init addr_limit correctly for 32 bit applications. So default to using mm->task_size for boundary condition checking. We use addr_limit to only control free space search. This makes sure that we do the right thing with 32 bit applications. We should consolidate the usage of TASK_SIZE/mm->task_size and mm->context.addr_limit later. This partially reverts commitfbfef9027c(powerpc/mm: Switch some TASK_SIZE checks to use mm_context addr_limit). Fixes:fbfef9027c("powerpc/mm: Switch some TASK_SIZE checks to use mm_context addr_limit") Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
#include <linux/mm.h>
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#include <linux/hugetlb.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/cacheflush.h>
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#include <asm/machdep.h>
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#include <asm/mman.h>
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#include <asm/tlb.h>
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void radix__flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
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{
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int psize;
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struct hstate *hstate = hstate_file(vma->vm_file);
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psize = hstate_get_psize(hstate);
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radix__flush_tlb_page_psize(vma->vm_mm, vmaddr, psize);
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}
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void radix__local_flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
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{
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int psize;
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struct hstate *hstate = hstate_file(vma->vm_file);
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psize = hstate_get_psize(hstate);
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radix__local_flush_tlb_page_psize(vma->vm_mm, vmaddr, psize);
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}
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void radix__flush_hugetlb_tlb_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end)
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{
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int psize;
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struct hstate *hstate = hstate_file(vma->vm_file);
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psize = hstate_get_psize(hstate);
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radix__flush_tlb_range_psize(vma->vm_mm, start, end, psize);
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}
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/*
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* A vairant of hugetlb_get_unmapped_area doing topdown search
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* FIXME!! should we do as x86 does or non hugetlb area does ?
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* ie, use topdown or not based on mmap_is_legacy check ?
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*/
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unsigned long
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radix__hugetlb_get_unmapped_area(struct file *file, 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 hstate *h = hstate_file(file);
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struct vm_unmapped_area_info info;
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if (unlikely(addr > mm->context.addr_limit && addr < TASK_SIZE))
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mm->context.addr_limit = TASK_SIZE;
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if (len & ~huge_page_mask(h))
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return -EINVAL;
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if (len > mm->task_size)
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return -ENOMEM;
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if (flags & MAP_FIXED) {
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if (prepare_hugepage_range(file, addr, len))
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return -EINVAL;
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return addr;
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}
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if (addr) {
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addr = ALIGN(addr, huge_page_size(h));
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vma = find_vma(mm, addr);
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if (mm->task_size - len >= addr &&
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(!vma || addr + len <= vma->vm_start))
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return addr;
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}
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/*
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* We are always doing an topdown search here. Slice code
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* does that too.
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*/
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info.flags = VM_UNMAPPED_AREA_TOPDOWN;
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info.length = len;
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info.low_limit = PAGE_SIZE;
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info.high_limit = current->mm->mmap_base;
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info.align_mask = PAGE_MASK & ~huge_page_mask(h);
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info.align_offset = 0;
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if (addr > DEFAULT_MAP_WINDOW)
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info.high_limit += mm->context.addr_limit - DEFAULT_MAP_WINDOW;
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return vm_unmapped_area(&info);
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}
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