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Date: Mon, 22 Aug 2022 15:06:27 +0000 From: Liam Howlett <liam.howlett@...cle.com> To: "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org> CC: "Matthew Wilcox (Oracle)" <willy@...radead.org>, Liam Howlett <liam.howlett@...cle.com>, Vlastimil Babka <vbabka@...e.cz> Subject: [PATCH v13 49/70] fork: use VMA iterator From: "Matthew Wilcox (Oracle)" <willy@...radead.org> The VMA iterator is faster than the linked list and removing the linked list will shrink the vm_area_struct. Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org> Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com> Acked-by: Vlastimil Babka <vbabka@...e.cz> --- kernel/fork.c | 7 +++++-- 1 file 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); -- 2.35.1
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