The quilt patch titled
Subject: mm/gup: detect huge pfnmap entries in gup-fast
has been removed from the -mm tree. Its filename was
mm-gup-detect-huge-pfnmap-entries-in-gup-fast.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: Peter Xu <peterx@xxxxxxxxxx>
Subject: mm/gup: detect huge pfnmap entries in gup-fast
Date: Mon, 26 Aug 2024 16:43:39 -0400
Since gup-fast doesn't have the vma reference, teach it to detect such huge
pfnmaps by checking the special bit for pmd/pud too, just like ptes.
Link: https://lkml.kernel.org/r/20240826204353.2228736-6-peterx@xxxxxxxxxx
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Cc: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Cc: Alex Williamson <alex.williamson@xxxxxxxxxx>
Cc: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Gavin Shan <gshan@xxxxxxxxxx>
Cc: Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx>
Cc: Heiko Carstens <hca@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Niklas Schnelle <schnelle@xxxxxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Sean Christopherson <seanjc@xxxxxxxxxx>
Cc: Sven Schnelle <svens@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/gup.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/mm/gup.c~mm-gup-detect-huge-pfnmap-entries-in-gup-fast
+++ a/mm/gup.c
@@ -3038,6 +3038,9 @@ static int gup_fast_pmd_leaf(pmd_t orig,
if (!pmd_access_permitted(orig, flags & FOLL_WRITE))
return 0;
+ if (pmd_special(orig))
+ return 0;
+
if (pmd_devmap(orig)) {
if (unlikely(flags & FOLL_LONGTERM))
return 0;
@@ -3082,6 +3085,9 @@ static int gup_fast_pud_leaf(pud_t orig,
if (!pud_access_permitted(orig, flags & FOLL_WRITE))
return 0;
+ if (pud_special(orig))
+ return 0;
+
if (pud_devmap(orig)) {
if (unlikely(flags & FOLL_LONGTERM))
return 0;
_
Patches currently in -mm which might be from peterx@xxxxxxxxxx are
