[PATCH 0/3] mmap: Remove do_brk_munmap() optimization

Liam Howlett liam.howlett at oracle.com
Tue Jul 19 12:14:01 PDT 2022


The following is a series of changes to remove the do_brk_munmap()
optimization that Hugh flagged as an issue.  Please apply patch 1 to
(mm/mmap: change do_brk_flags() to expand existing VMA and add
do_brk_munmap()) and the last two should replace patches in the v11 set.

2/3 should replace 28/69
3/3 should replace 29/69

The end result should look like this:

static int do_brk_munmap(struct ma_state *mas, struct vm_area_struct *vma,                                          
                         unsigned long newbrk, unsigned long oldbrk,                                                
                         struct list_head *uf)                                                                      
        struct mm_struct *mm = vma->vm_mm;                                                                          
        int ret;                                                                                                    
        arch_unmap(mm, newbrk, oldbrk);
        ret = do_mas_align_munmap(mas, vma, mm, newbrk, oldbrk, uf, true);                                          
        return ret;                                                                                                 


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