[merged mm-stable] mm-hugetlb-add-missing-vm_fault_set_hindex-in-hugetlb_fault.patch removed from -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The quilt patch titled
     Subject: mm/hugetlb: add missing VM_FAULT_SET_HINDEX in hugetlb_fault
has been removed from the -mm tree.  Its filename was
     mm-hugetlb-add-missing-vm_fault_set_hindex-in-hugetlb_fault.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: Oscar Salvador <osalvador@suse.de>
Subject: mm/hugetlb: add missing VM_FAULT_SET_HINDEX in hugetlb_fault
Date: Thu, 9 May 2024 12:01:47 +0200

Patch series "Minor fixups for hugetlb fault path".

This series contains a couple of fixups for hugetlb_fault and hugetlb_wp
respectively, where a VM_FAULT_SET_HINDEX call was missing.

I did not bother with a Fixes tag because the missing piece here is that
we will not report to userspace the right extension of the faulty area by
adjusting struct kernel_siginfo.si_addr_lsb, but I do not consider that to
be a big issue because I assume that userspace already knows the size of
the mapping anyway.


This patch (of 2):

commit af19487f00f3 ("mm: make PTE_MARKER_SWAPIN_ERROR more general")
added the code to handle pte_markers in hugetlb faulting path.  In case of
an UFFD_POISON event, a PTE_MARKER_POISONED will be created and we will
return VM_FAULT_HWPOISON_LARGE upon detecting that in the fault path.  Add
the missing VM_FAULT_SET_HINDEX, so the right si_addr_lsb will be passed
to userspace to report the extension of the faulty area.

Link: https://lkml.kernel.org/r/20240509100148.22384-1-osalvador@suse.de
Link: https://lkml.kernel.org/r/20240509100148.22384-2-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Acked-by: Peter Xu <peterx@redhat.com>
Acked-by: Axel Rasmussen <axelrasmussen@google.com>
Cc: Liu Shixin <liushixin2@huawei.com>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/hugetlb.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/mm/hugetlb.c~mm-hugetlb-add-missing-vm_fault_set_hindex-in-hugetlb_fault
+++ a/mm/hugetlb.c
@@ -6485,7 +6485,8 @@ vm_fault_t hugetlb_fault(struct mm_struc
 				pte_marker_get(pte_to_swp_entry(vmf.orig_pte));
 
 			if (marker & PTE_MARKER_POISONED) {
-				ret = VM_FAULT_HWPOISON_LARGE;
+				ret = VM_FAULT_HWPOISON_LARGE |
+				      VM_FAULT_SET_HINDEX(hstate_index(h));
 				goto out_mutex;
 			}
 		}
_

Patches currently in -mm which might be from osalvador@suse.de are