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| H A D | mmap.c | diff 28c5609fb236807910ca347ad3e26c4567998526 Tue Oct 11 18:08:37 CEST 2022 Liam Howlett <liam.howlett@oracle.com> mm/mmap: preallocate maple nodes for brk vma expansion
If the brk VMA is the last vma in a maple node and meets the rare criteria
that it can be expanded, then preallocation is necessary to avoid a
potential fs_reclaim circular lock issue on low resources.
At the same time use the actual vma start address (unaligned) when calling
vma_adjust_trans_huge().
Link: https://lkml.kernel.org/r/20221011160624.1253454-1-Liam.Howlett@oracle.com
Fixes: 2e7ce7d354f2 (mm/mmap: change do_brk_flags() to expand existing VMA and add do_brk_munmap())
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reported-by: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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