[merged mm-stable] mempolicy-remove-confusing-mpol_mf_lazy-dead-code.patch removed from -mm tree

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The quilt patch titled
     Subject: mempolicy: remove confusing MPOL_MF_LAZY dead code
has been removed from the -mm tree.  Its filename was
     mempolicy-remove-confusing-mpol_mf_lazy-dead-code.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: Hugh Dickins <hughd@xxxxxxxxxx>
Subject: mempolicy: remove confusing MPOL_MF_LAZY dead code
Date: Tue, 3 Oct 2023 02:24:18 -0700 (PDT)

v3.8 commit b24f53a0bea3 ("mm: mempolicy: Add MPOL_MF_LAZY") introduced
MPOL_MF_LAZY, and included it in the MPOL_MF_VALID flags; but a720094ded8
("mm: mempolicy: Hide MPOL_NOOP and MPOL_MF_LAZY from userspace for now")
immediately removed it from MPOL_MF_VALID flags, pending further review. 
"This will need to be revisited", but it has not been reinstated.

The present state is confusing: there is dead code in mm/mempolicy.c to
handle MPOL_MF_LAZY cases which can never occur.  Remove that: it can be
resurrected later if necessary.  But keep the definition of MPOL_MF_LAZY,
which must remain in the UAPI, even though it always fails with EINVAL.

https://lore.kernel.org/linux-mm/1553041659-46787-1-git-send-email-yang.shi@xxxxxxxxxxxxxxxxx/
links to a previous request to remove MPOL_MF_LAZY.

Link: https://lkml.kernel.org/r/80c9665c-1c3f-17ba-21a3-f6115cebf7d@xxxxxxxxxx
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
Reviewed-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Reviewed-by: Yang Shi <shy828301@xxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: "Huang, Ying" <ying.huang@xxxxxxxxx>
Cc: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Nhat Pham <nphamcs@xxxxxxxxx>
Cc: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Cc: Tejun heo <tj@xxxxxxxxxx>
Cc: Vishal Moola (Oracle) <vishal.moola@xxxxxxxxx>
Cc: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 include/uapi/linux/mempolicy.h |    2 +-
 mm/mempolicy.c                 |   18 ------------------
 2 files changed, 1 insertion(+), 19 deletions(-)

--- a/include/uapi/linux/mempolicy.h~mempolicy-remove-confusing-mpol_mf_lazy-dead-code
+++ a/include/uapi/linux/mempolicy.h
@@ -48,7 +48,7 @@ enum {
 #define MPOL_MF_MOVE	 (1<<1)	/* Move pages owned by this process to conform
 				   to policy */
 #define MPOL_MF_MOVE_ALL (1<<2)	/* Move every page to conform to policy */
-#define MPOL_MF_LAZY	 (1<<3)	/* Modifies '_MOVE:  lazy migrate on fault */
+#define MPOL_MF_LAZY	 (1<<3)	/* UNSUPPORTED FLAG: Lazy migrate on fault */
 #define MPOL_MF_INTERNAL (1<<4)	/* Internal flags start here */
 
 #define MPOL_MF_VALID	(MPOL_MF_STRICT   | 	\
--- a/mm/mempolicy.c~mempolicy-remove-confusing-mpol_mf_lazy-dead-code
+++ a/mm/mempolicy.c
@@ -636,12 +636,6 @@ unsigned long change_prot_numa(struct vm
 
 	return nr_updated;
 }
-#else
-static unsigned long change_prot_numa(struct vm_area_struct *vma,
-			unsigned long addr, unsigned long end)
-{
-	return 0;
-}
 #endif /* CONFIG_NUMA_BALANCING */
 
 static int queue_pages_test_walk(unsigned long start, unsigned long end,
@@ -680,14 +674,6 @@ static int queue_pages_test_walk(unsigne
 	if (endvma > end)
 		endvma = end;
 
-	if (flags & MPOL_MF_LAZY) {
-		/* Similar to task_numa_work, skip inaccessible VMAs */
-		if (!is_vm_hugetlb_page(vma) && vma_is_accessible(vma) &&
-			!(vma->vm_flags & VM_MIXEDMAP))
-			change_prot_numa(vma, start, endvma);
-		return 1;
-	}
-
 	/*
 	 * Check page nodes, and queue pages to move, in the current vma.
 	 * But if no moving, and no strict checking, the scan can be skipped.
@@ -1254,9 +1240,6 @@ static long do_mbind(unsigned long start
 	if (IS_ERR(new))
 		return PTR_ERR(new);
 
-	if (flags & MPOL_MF_LAZY)
-		new->flags |= MPOL_F_MOF;
-
 	/*
 	 * If we are using the default policy then operation
 	 * on discontinuous address spaces is okay after all
@@ -1301,7 +1284,6 @@ static long do_mbind(unsigned long start
 
 	if (!err) {
 		if (!list_empty(&pagelist)) {
-			WARN_ON_ONCE(flags & MPOL_MF_LAZY);
 			nr_failed |= migrate_pages(&pagelist, new_folio, NULL,
 				start, MIGRATE_SYNC, MR_MEMPOLICY_MBIND, NULL);
 		}
_

Patches currently in -mm which might be from hughd@xxxxxxxxxx are





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