mm/oom_kill: use maple tree iterators instead of vma linked list

Link: https://lkml.kernel.org/r/20220504011345.662299-46-Liam.Howlett@oracle.com
Link: https://lkml.kernel.org/r/20220621204632.3370049-62-Liam.Howlett@oracle.com
Link: https://lkml.kernel.org/r/20220720021727.17018-62-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Howells <dhowells@redhat.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: SeongJae Park <sj@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hulk Robot <hulkci@huawei.com>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 3c6cf9e3cd66ea67cfe317dbe0f91c54d2e4faa8..3996301450e8d3e14de66d907b31a0e0cd961848 100644 (file)
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -513,6 +513,7 @@ bool __oom_reap_task_mm(struct mm_struct *mm)
 {
        struct vm_area_struct *vma;
        bool ret = true;
+       VMA_ITERATOR(vmi, mm, 0);
 
        /*
         * Tell all users of get_user/copy_from_user etc... that the content
@@ -522,7 +523,7 @@ bool __oom_reap_task_mm(struct mm_struct *mm)
         */
        set_bit(MMF_UNSTABLE, &mm->flags);
 
-       for (vma = mm->mmap ; vma; vma = vma->vm_next) {
+       for_each_vma(vmi, vma) {
                if (vma->vm_flags & (VM_HUGETLB|VM_PFNMAP))
                        continue;