The quilt patch titled
Subject: x86/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE
has been removed from the -mm tree. Its filename was
x86-pgtable-support-__have_arch_pte_swp_exclusive.patch
This patch was dropped because it was merged into mm-stable
------------------------------------------------------
From: David Hildenbrand <david@xxxxxxxxxx>
Subject: x86/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE
Let's use bit 3 to remember PG_anon_exclusive in swap ptes.
[david@xxxxxxxxxx: fix 32-bit swap layout]
Link: https://lkml.kernel.org/r/d875c292-46b3-f281-65ae-71d0b0c6f592@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20220329164329.208407-4-david@xxxxxxxxxx
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Don Dutile <ddutile@xxxxxxxxxx>
Cc: Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx>
Cc: Heiko Carstens <hca@xxxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Jann Horn <jannh@xxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Liang Zhang <zhangliang5@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Cc: Nadav Amit <namit@xxxxxxxxxx>
Cc: Oded Gabbay <oded.gabbay@xxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Pedro Demarchi Gomes <pedrodemargomes@xxxxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxxx>
Cc: Roman Gushchin <guro@xxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/include/asm/pgtable.h | 17 +++++++++++++++++
arch/x86/include/asm/pgtable_64.h | 4 +++-
arch/x86/include/asm/pgtable_64_types.h | 5 +++++
3 files changed, 25 insertions(+), 1 deletion(-)
--- a/arch/x86/include/asm/pgtable_64.h~x86-pgtable-support-__have_arch_pte_swp_exclusive
+++ a/arch/x86/include/asm/pgtable_64.h
@@ -186,7 +186,7 @@ static inline void native_pgd_clear(pgd_
*
* | ... | 11| 10| 9|8|7|6|5| 4| 3|2| 1|0| <- bit number
* | ... |SW3|SW2|SW1|G|L|D|A|CD|WT|U| W|P| <- bit names
- * | TYPE (59-63) | ~OFFSET (9-58) |0|0|X|X| X| X|F|SD|0| <- swp entry
+ * | TYPE (59-63) | ~OFFSET (9-58) |0|0|X|X| X| E|F|SD|0| <- swp entry
*
* G (8) is aliased and used as a PROT_NONE indicator for
* !present ptes. We need to start storing swap entries above
@@ -203,6 +203,8 @@ static inline void native_pgd_clear(pgd_
* F (2) in swp entry is used to record when a pagetable is
* writeprotected by userfaultfd WP support.
*
+ * E (3) in swp entry is used to rememeber PG_anon_exclusive.
+ *
* Bit 7 in swp entry should be 0 because pmd_present checks not only P,
* but also L and G.
*
--- a/arch/x86/include/asm/pgtable_64_types.h~x86-pgtable-support-__have_arch_pte_swp_exclusive
+++ a/arch/x86/include/asm/pgtable_64_types.h
@@ -163,4 +163,9 @@ extern unsigned int ptrs_per_p4d;
#define PGD_KERNEL_START ((PAGE_SIZE / 2) / sizeof(pgd_t))
+/*
+ * We borrow bit 3 to remember PG_anon_exclusive.
+ */
+#define _PAGE_SWP_EXCLUSIVE _PAGE_PWT
+
#endif /* _ASM_X86_PGTABLE_64_DEFS_H */
--- a/arch/x86/include/asm/pgtable.h~x86-pgtable-support-__have_arch_pte_swp_exclusive
+++ a/arch/x86/include/asm/pgtable.h
@@ -1286,6 +1286,23 @@ static inline void update_mmu_cache_pud(
unsigned long addr, pud_t *pud)
{
}
+#ifdef _PAGE_SWP_EXCLUSIVE
+#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
+static inline pte_t pte_swp_mkexclusive(pte_t pte)
+{
+ return pte_set_flags(pte, _PAGE_SWP_EXCLUSIVE);
+}
+
+static inline int pte_swp_exclusive(pte_t pte)
+{
+ return pte_flags(pte) & _PAGE_SWP_EXCLUSIVE;
+}
+
+static inline pte_t pte_swp_clear_exclusive(pte_t pte)
+{
+ return pte_clear_flags(pte, _PAGE_SWP_EXCLUSIVE);
+}
+#endif /* _PAGE_SWP_EXCLUSIVE */
#ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
_
Patches currently in -mm which might be from david@xxxxxxxxxx are
