linux-kernel - [PATCH 0/3] mmap: Remove do_brk

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Message-ID: <20220719191352.3366482-1-Liam.Howlett@oracle.com>
Date:   Tue, 19 Jul 2022 19:14:01 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Hugh Dickins <hughd@...gle.com>
CC:     Yu Zhao <yuzhao@...gle.com>
Subject: [PATCH 0/3] mmap: Remove do_brk_munmap() optimization

Andrew,

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);                                          
        validate_mm_mt(mm);                                                                                         
        return ret;                                                                                                 
}

Thanks,
Liam