The patch titled
Subject: mm: pgtable: introduce generic __tlb_remove_table()
has been added to the -mm mm-unstable branch. Its filename is
mm-pgtable-introduce-generic-__tlb_remove_table.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-pgtable-introduce-generic-__tlb_remove_table.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: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
Subject: mm: pgtable: introduce generic __tlb_remove_table()
Date: Mon, 23 Dec 2024 17:40:59 +0800
Several architectures (arm, arm64, riscv and x86) define exactly the same
__tlb_remove_table(), just introduce generic __tlb_remove_table() to
eliminate these duplications.
The s390 __tlb_remove_table() is nearly the same, so also make s390
__tlb_remove_table() version generic.
Link: https://lkml.kernel.org/r/f7febc7719fd84673a8eae8af71b7b4278d3e110.1734945104.git.zhengqi.arch@xxxxxxxxxxxxx
Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
Cc: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Cc: Aneesh Kumar K.V (Arm) <aneesh.kumar@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Jann Horn <jannh@xxxxxxxxxx>
Cc: Kevin Brodsky <kevin.brodsky@xxxxxxx>
Cc: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Vishal Moola (Oracle) <vishal.moola@xxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Yu Zhao <yuzhao@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm/include/asm/tlb.h | 9 ---------
arch/arm64/include/asm/tlb.h | 7 -------
arch/powerpc/include/asm/tlb.h | 1 +
arch/riscv/include/asm/tlb.h | 12 ------------
arch/s390/include/asm/tlb.h | 9 ++++-----
arch/s390/mm/pgalloc.c | 7 -------
arch/sparc/include/asm/tlb_32.h | 1 +
arch/sparc/include/asm/tlb_64.h | 1 +
arch/x86/include/asm/tlb.h | 17 -----------------
include/asm-generic/tlb.h | 15 +++++++++++++--
10 files changed, 20 insertions(+), 59 deletions(-)
--- a/arch/arm64/include/asm/tlb.h~mm-pgtable-introduce-generic-__tlb_remove_table
+++ a/arch/arm64/include/asm/tlb.h
@@ -10,13 +10,6 @@
#include <linux/pagemap.h>
-static inline void __tlb_remove_table(void *_table)
-{
- struct ptdesc *ptdesc = (struct ptdesc *)_table;
-
- pagetable_dtor(ptdesc);
- pagetable_free(ptdesc);
-}
#define tlb_flush tlb_flush
static void tlb_flush(struct mmu_gather *tlb);
--- a/arch/arm/include/asm/tlb.h~mm-pgtable-introduce-generic-__tlb_remove_table
+++ a/arch/arm/include/asm/tlb.h
@@ -27,15 +27,6 @@
#else /* !CONFIG_MMU */
#include <asm/tlbflush.h>
-
-static inline void __tlb_remove_table(void *_table)
-{
- struct ptdesc *ptdesc = (struct ptdesc *)_table;
-
- pagetable_dtor(ptdesc);
- pagetable_free(ptdesc);
-}
-
#include <asm-generic/tlb.h>
static inline void
--- a/arch/powerpc/include/asm/tlb.h~mm-pgtable-introduce-generic-__tlb_remove_table
+++ a/arch/powerpc/include/asm/tlb.h
@@ -37,6 +37,7 @@ extern void tlb_flush(struct mmu_gather
*/
#define tlb_needs_table_invalidate() radix_enabled()
+#define __HAVE_ARCH_TLB_REMOVE_TABLE
/* Get the generic bits... */
#include <asm-generic/tlb.h>
--- a/arch/riscv/include/asm/tlb.h~mm-pgtable-introduce-generic-__tlb_remove_table
+++ a/arch/riscv/include/asm/tlb.h
@@ -10,18 +10,6 @@ struct mmu_gather;
static void tlb_flush(struct mmu_gather *tlb);
-#ifdef CONFIG_MMU
-
-static inline void __tlb_remove_table(void *table)
-{
- struct ptdesc *ptdesc = (struct ptdesc *)table;
-
- pagetable_dtor(ptdesc);
- pagetable_free(ptdesc);
-}
-
-#endif /* CONFIG_MMU */
-
#define tlb_flush tlb_flush
#include <asm-generic/tlb.h>
--- a/arch/s390/include/asm/tlb.h~mm-pgtable-introduce-generic-__tlb_remove_table
+++ a/arch/s390/include/asm/tlb.h
@@ -22,7 +22,6 @@
* Pages used for the page tables is a different story. FIXME: more
*/
-void __tlb_remove_table(void *_table);
static inline void tlb_flush(struct mmu_gather *tlb);
static inline bool __tlb_remove_page_size(struct mmu_gather *tlb,
struct page *page, bool delay_rmap, int page_size);
@@ -87,7 +86,7 @@ static inline void pte_free_tlb(struct m
tlb->cleared_pmds = 1;
if (mm_alloc_pgste(tlb->mm))
gmap_unlink(tlb->mm, (unsigned long *)pte, address);
- tlb_remove_ptdesc(tlb, pte);
+ tlb_remove_ptdesc(tlb, virt_to_ptdesc(pte));
}
/*
@@ -106,7 +105,7 @@ static inline void pmd_free_tlb(struct m
tlb->mm->context.flush_mm = 1;
tlb->freed_tables = 1;
tlb->cleared_puds = 1;
- tlb_remove_ptdesc(tlb, pmd);
+ tlb_remove_ptdesc(tlb, virt_to_ptdesc(pmd));
}
/*
@@ -124,7 +123,7 @@ static inline void pud_free_tlb(struct m
tlb->mm->context.flush_mm = 1;
tlb->freed_tables = 1;
tlb->cleared_p4ds = 1;
- tlb_remove_ptdesc(tlb, pud);
+ tlb_remove_ptdesc(tlb, virt_to_ptdesc(pud));
}
/*
@@ -142,7 +141,7 @@ static inline void p4d_free_tlb(struct m
__tlb_adjust_range(tlb, address, PAGE_SIZE);
tlb->mm->context.flush_mm = 1;
tlb->freed_tables = 1;
- tlb_remove_ptdesc(tlb, p4d);
+ tlb_remove_ptdesc(tlb, virt_to_ptdesc(p4d));
}
#endif /* _S390_TLB_H */
--- a/arch/s390/mm/pgalloc.c~mm-pgtable-introduce-generic-__tlb_remove_table
+++ a/arch/s390/mm/pgalloc.c
@@ -193,13 +193,6 @@ void page_table_free(struct mm_struct *m
pagetable_dtor_free(ptdesc);
}
-void __tlb_remove_table(void *table)
-{
- struct ptdesc *ptdesc = virt_to_ptdesc(table);
-
- pagetable_dtor_free(ptdesc);
-}
-
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static void pte_free_now(struct rcu_head *head)
{
--- a/arch/sparc/include/asm/tlb_32.h~mm-pgtable-introduce-generic-__tlb_remove_table
+++ a/arch/sparc/include/asm/tlb_32.h
@@ -2,6 +2,7 @@
#ifndef _SPARC_TLB_H
#define _SPARC_TLB_H
+#define __HAVE_ARCH_TLB_REMOVE_TABLE
#include <asm-generic/tlb.h>
#endif /* _SPARC_TLB_H */
--- a/arch/sparc/include/asm/tlb_64.h~mm-pgtable-introduce-generic-__tlb_remove_table
+++ a/arch/sparc/include/asm/tlb_64.h
@@ -33,6 +33,7 @@ void flush_tlb_pending(void);
#define tlb_needs_table_invalidate() (false)
#endif
+#define __HAVE_ARCH_TLB_REMOVE_TABLE
#include <asm-generic/tlb.h>
#endif /* _SPARC64_TLB_H */
--- a/arch/x86/include/asm/tlb.h~mm-pgtable-introduce-generic-__tlb_remove_table
+++ a/arch/x86/include/asm/tlb.h
@@ -20,23 +20,6 @@ static inline void tlb_flush(struct mmu_
flush_tlb_mm_range(tlb->mm, start, end, stride_shift, tlb->freed_tables);
}
-/*
- * While x86 architecture in general requires an IPI to perform TLB
- * shootdown, enablement code for several hypervisors overrides
- * .flush_tlb_others hook in pv_mmu_ops and implements it by issuing
- * a hypercall. To keep software pagetable walkers safe in this case we
- * switch to RCU based table free (MMU_GATHER_RCU_TABLE_FREE). See the comment
- * below 'ifdef CONFIG_MMU_GATHER_RCU_TABLE_FREE' in include/asm-generic/tlb.h
- * for more details.
- */
-static inline void __tlb_remove_table(void *table)
-{
- struct ptdesc *ptdesc = (struct ptdesc *)table;
-
- pagetable_dtor(ptdesc);
- pagetable_free(ptdesc);
-}
-
#ifdef CONFIG_PT_RECLAIM
static inline void __tlb_remove_table_one_rcu(struct rcu_head *head)
{
--- a/include/asm-generic/tlb.h~mm-pgtable-introduce-generic-__tlb_remove_table
+++ a/include/asm-generic/tlb.h
@@ -153,8 +153,9 @@
*
* Useful if your architecture has non-page page directories.
*
- * When used, an architecture is expected to provide __tlb_remove_table()
- * which does the actual freeing of these pages.
+ * When used, an architecture is expected to provide __tlb_remove_table() or
+ * use the generic __tlb_remove_table(), which does the actual freeing of these
+ * pages.
*
* MMU_GATHER_RCU_TABLE_FREE
*
@@ -207,6 +208,16 @@ struct mmu_table_batch {
#define MAX_TABLE_BATCH \
((PAGE_SIZE - sizeof(struct mmu_table_batch)) / sizeof(void *))
+#ifndef __HAVE_ARCH_TLB_REMOVE_TABLE
+static inline void __tlb_remove_table(void *table)
+{
+ struct ptdesc *ptdesc = (struct ptdesc *)table;
+
+ pagetable_dtor(ptdesc);
+ pagetable_free(ptdesc);
+}
+#endif
+
extern void tlb_remove_table(struct mmu_gather *tlb, void *table);
#else /* !CONFIG_MMU_GATHER_HAVE_TABLE_FREE */
_
Patches currently in -mm which might be from zhengqi.arch@xxxxxxxxxxxxx are
mm-pgtable-make-ptep_clear-non-atomic.patch
mm-khugepaged-recheck-pmd-state-in-retract_page_tables.patch
mm-userfaultfd-recheck-dst_pmd-entry-in-move_pages_pte.patch
mm-userfaultfd-recheck-dst_pmd-entry-in-move_pages_pte-fix.patch
mm-introduce-zap_nonpresent_ptes.patch
mm-introduce-do_zap_pte_range.patch
mm-skip-over-all-consecutive-none-ptes-in-do_zap_pte_range.patch
mm-zap_install_uffd_wp_if_needed-return-whether-uffd-wp-pte-has-been-re-installed.patch
mm-do_zap_pte_range-return-any_skipped-information-to-the-caller.patch
mm-make-zap_pte_range-handle-full-within-pmd-range.patch
mm-pgtable-reclaim-empty-pte-page-in-madvisemadv_dontneed.patch
mm-pgtable-reclaim-empty-pte-page-in-madvisemadv_dontneed-fix.patch
x86-mm-free-page-table-pages-by-rcu-instead-of-semi-rcu.patch
mm-pgtable-make-ptlock-be-freed-by-rcu.patch
x86-select-arch_supports_pt_reclaim-if-x86_64.patch
revert-mm-pgtable-make-ptlock-be-freed-by-rcu.patch
mm-pgtable-add-statistics-for-p4d-level-page-table.patch
arm64-pgtable-use-mmu-gather-to-free-p4d-level-page-table.patch
s390-pgtable-add-statistics-for-pud-and-p4d-level-page-table.patch
mm-pgtable-introduce-pagetable_dtor.patch
arm-pgtable-move-pagetable_dtor-to-__tlb_remove_table.patch
arm64-pgtable-move-pagetable_dtor-to-__tlb_remove_table.patch
riscv-pgtable-move-pagetable_dtor-to-__tlb_remove_table.patch
x86-pgtable-move-pagetable_dtor-to-__tlb_remove_table.patch
s390-pgtable-also-move-pagetable_dtor-of-pxd-to-__tlb_remove_table.patch
mm-pgtable-introduce-generic-__tlb_remove_table.patch
mm-pgtable-move-__tlb_remove_table_one-in-x86-to-generic-file.patch
mm-pgtable-remove-tlb_remove_page_ptdesc.patch
mm-pgtable-remove-tlb_remove_ptdesc.patch
mm-pgtable-introduce-generic-pagetable_dtor_free.patch
