+ mm-mmu_gather-do-not-expose-delayed_rmap-flag.patch added to mm-unstable branch

+ mm-mmu_gather-do-not-expose-delayed_rmap-flag.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm: mmu_gather: do not expose delayed_rmap flag
has been added to the -mm mm-unstable branch.  Its filename is
     mm-mmu_gather-do-not-expose-delayed_rmap-flag.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mmu_gather-do-not-expose-delayed_rmap-flag.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Alexander Gordeev <agordeev@linux.ibm.com>
Subject: mm: mmu_gather: do not expose delayed_rmap flag
Date: Wed, 16 Nov 2022 08:49:30 +0100

Flag delayed_rmap of 'struct mmu_gather' is rather a private member, but
it is still accessed directly.  Instead, let the TLB gather code access
the flag.

Link: https://lkml.kernel.org/r/Y3SWCu6NRaMQ5dbD@li-4a3a4a4c-28e5-11b2-a85c-a8d192c6f089.ibm.com
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/memory.c     |    3 +--
 mm/mmu_gather.c |    3 +++
 2 files changed, 4 insertions(+), 2 deletions(-)

--- a/mm/memory.c~mm-mmu_gather-do-not-expose-delayed_rmap-flag
+++ a/mm/memory.c
@@ -1465,8 +1465,7 @@ again:
 	/* Do the actual TLB flush before dropping ptl */
 	if (force_flush) {
 		tlb_flush_mmu_tlbonly(tlb);
-		if (tlb->delayed_rmap)
-			tlb_flush_rmaps(tlb, vma);
+		tlb_flush_rmaps(tlb, vma);
 	}
 	pte_unmap_unlock(start_pte, ptl);
 
--- a/mm/mmu_gather.c~mm-mmu_gather-do-not-expose-delayed_rmap-flag
+++ a/mm/mmu_gather.c
@@ -60,6 +60,9 @@ void tlb_flush_rmaps(struct mmu_gather *
 {
 	struct mmu_gather_batch *batch;
 
+	if (!tlb->delayed_rmap)
+		return;
+
 	batch = tlb->active;
 	for (int i = 0; i < batch->nr; i++) {
 		struct encoded_page *enc = batch->encoded_pages[i];
_

Patches currently in -mm which might be from agordeev@linux.ibm.com are

mm-mmu_gather-do-not-expose-delayed_rmap-flag.patch