[merged mm-stable] mm-use-vma_start_write_killable-in-dup_mmap.patch removed from -mm tree

[merged mm-stable] mm-use-vma_start_write_killable-in-dup_mmap.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm: use vma_start_write_killable() in dup_mmap()
has been removed from the -mm tree.  Its filename was
     mm-use-vma_start_write_killable-in-dup_mmap.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: mm: use vma_start_write_killable() in dup_mmap()
Date: Mon, 10 Nov 2025 20:32:02 +0000

Allow waiting for the VMA write lock to be interrupted by fatal signals. 
The explicit check for fatal_signal_pending() can be removed as it is
checked during vma_start_write_killable().  Improves the latency of
killing the task as we do not wait for the reader to finish before
checking for signals.

Link: https://lkml.kernel.org/r/20251110203204.1454057-3-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Chris Li <chriscli@google.com>
Cc: Jann Horn <jannh@google.com>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/mmap.c |   12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

--- a/mm/mmap.c~mm-use-vma_start_write_killable-in-dup_mmap
+++ a/mm/mmap.c
@@ -1747,7 +1747,9 @@ __latent_entropy int dup_mmap(struct mm_
 	for_each_vma(vmi, mpnt) {
 		struct file *file;
 
-		vma_start_write(mpnt);
+		retval = vma_start_write_killable(mpnt);
+		if (retval < 0)
+			goto loop_out;
 		if (mpnt->vm_flags & VM_DONTCOPY) {
 			retval = vma_iter_clear_gfp(&vmi, mpnt->vm_start,
 						    mpnt->vm_end, GFP_KERNEL);
@@ -1758,14 +1760,6 @@ __latent_entropy int dup_mmap(struct mm_
 			continue;
 		}
 		charge = 0;
-		/*
-		 * Don't duplicate many vmas if we've been oom-killed (for
-		 * example)
-		 */
-		if (fatal_signal_pending(current)) {
-			retval = -EINTR;
-			goto loop_out;
-		}
 		if (mpnt->vm_flags & VM_ACCOUNT) {
 			unsigned long len = vma_pages(mpnt);
 
_

Patches currently in -mm which might be from willy@infradead.org are

mm-tweak-__vma_enter_locked.patch