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    Subject[PATCH RESEND 5/8] mm: Start fallback top-down mmap at mm->mmap_base
    Date
    In case of mmap failure in top-down mode, there is no need to go through
    the whole address space again for the bottom-up fallback: the goal of this
    fallback is to find, as a last resort, space between the top-down mmap base
    and the stack, which is the only place not covered by the top-down mmap.

    Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
    ---
    mm/mmap.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/mm/mmap.c b/mm/mmap.c
    index dedae10cb6e2..e563145c1ff4 100644
    --- a/mm/mmap.c
    +++ b/mm/mmap.c
    @@ -2185,7 +2185,7 @@ arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr,
    if (offset_in_page(addr)) {
    VM_BUG_ON(addr != -ENOMEM);
    info.flags = 0;
    - info.low_limit = TASK_UNMAPPED_BASE;
    + info.low_limit = arch_get_mmap_base(addr, mm->mmap_base);
    info.high_limit = mmap_end;
    addr = vm_unmapped_area(&info);
    }
    --
    2.20.1
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