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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2022-09-06 19:48:59 +0000 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-09-26 19:46:22 -0700 |
| commit | fa5e587679f034530e8c14bc1c466490053b2ff2 (patch) | |
| tree | 4ab8bd90fb3c12a9cdacd6a34cd2d819656bd4fe /kernel/fork.c | |
| parent | 0cd4d02c32123afc25647f1d7123bc13b51ac56b (diff) | |
| download | linux-stable-fa5e587679f034530e8c14bc1c466490053b2ff2.tar.gz linux-stable-fa5e587679f034530e8c14bc1c466490053b2ff2.tar.bz2 linux-stable-fa5e587679f034530e8c14bc1c466490053b2ff2.zip | |
fork: use VMA iterator
The VMA iterator is faster than the linked list and removing the linked
list will shrink the vm_area_struct.
Link: https://lkml.kernel.org/r/20220906194824.2110408-50-Liam.Howlett@oracle.com
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
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: SeongJae Park <sj@kernel.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 430f63cd7a37..49e4ab6f5208 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1301,13 +1301,16 @@ int replace_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file) /* Forbid mm->exe_file change if old file still mapped. */ old_exe_file = get_mm_exe_file(mm); if (old_exe_file) { + VMA_ITERATOR(vmi, mm, 0); mmap_read_lock(mm); - for (vma = mm->mmap; vma && !ret; vma = vma->vm_next) { + for_each_vma(vmi, vma) { if (!vma->vm_file) continue; if (path_equal(&vma->vm_file->f_path, - &old_exe_file->f_path)) + &old_exe_file->f_path)) { ret = -EBUSY; + break; + } } mmap_read_unlock(mm); fput(old_exe_file); |