summaryrefslogtreecommitdiff
path: root/kernel/fork.c
diff options
context:
space:
mode:
authorMatthew Wilcox (Oracle) <willy@infradead.org>2022-09-06 19:48:59 +0000
committerAndrew Morton <akpm@linux-foundation.org>2022-09-26 19:46:22 -0700
commitfa5e587679f034530e8c14bc1c466490053b2ff2 (patch)
tree4ab8bd90fb3c12a9cdacd6a34cd2d819656bd4fe /kernel/fork.c
parent0cd4d02c32123afc25647f1d7123bc13b51ac56b (diff)
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.c7
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);