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| author | Liam R. Howlett <Liam.Howlett@Oracle.com> | 2022-09-06 21:48:50 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-09-27 04:46:17 +0200 |
| commit | abdba2dda0c477ca708a939b02f9b2e74666ed2d (patch) | |
| tree | c634443af9c5026c42d8b3effb20de631bbb38d0 /mm/mmap.c | |
| parent | mm/mmap: change do_brk_flags() to expand existing VMA and add do_brk_munmap() (diff) | |
| download | linux-abdba2dda0c477ca708a939b02f9b2e74666ed2d.tar.xz linux-abdba2dda0c477ca708a939b02f9b2e74666ed2d.zip | |
mm: use maple tree operations for find_vma_intersection()
Move find_vma_intersection() to mmap.c and change implementation to maple
tree.
When searching for a vma within a range, it is easier to use the maple
tree interface.
Exported find_vma_intersection() for kvm module.
Link: https://lkml.kernel.org/r/20220906194824.2110408-24-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Tested-by: Yu Zhao <yuzhao@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: SeongJae Park <sj@kernel.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/mmap.c')
| -rw-r--r-- | mm/mmap.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 0baa2ca5b0bf..699af34c3573 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2062,6 +2062,35 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, EXPORT_SYMBOL(get_unmapped_area); /** + * find_vma_intersection() - Look up the first VMA which intersects the interval + * @mm: The process address space. + * @start_addr: The inclusive start user address. + * @end_addr: The exclusive end user address. + * + * Returns: The first VMA within the provided range, %NULL otherwise. Assumes + * start_addr < end_addr. + */ +struct vm_area_struct *find_vma_intersection(struct mm_struct *mm, + unsigned long start_addr, + unsigned long end_addr) +{ + struct vm_area_struct *vma; + unsigned long index = start_addr; + + mmap_assert_locked(mm); + /* Check the cache first. */ + vma = vmacache_find(mm, start_addr); + if (likely(vma)) + return vma; + + vma = mt_find(&mm->mm_mt, &index, end_addr - 1); + if (vma) + vmacache_update(start_addr, vma); + return vma; +} +EXPORT_SYMBOL(find_vma_intersection); + +/** * find_vma() - Find the VMA for a given address, or the next VMA. * @mm: The mm_struct to check * @addr: The address |