The patch titled
sparc64: use RCU page table freeing
has been added to the -mm tree. Its filename is
sparc64-use-rcu-page-table-freeing.patch
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------------------------------------------------------
Subject: sparc64: use RCU page table freeing
From: David S. Miller <davem@xxxxxxxxxxxxx>
Make use of the generic RCU page table freeing on Sparc64, doing so allows
for race-free software page-table walkers like gup_fast().
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/sparc/Kconfig | 1
arch/sparc/include/asm/pgalloc_64.h | 48 ++++++++++++++++++++++++--
2 files changed, 47 insertions(+), 2 deletions(-)
diff -puN arch/sparc/Kconfig~sparc64-use-rcu-page-table-freeing arch/sparc/Kconfig
--- a/arch/sparc/Kconfig~sparc64-use-rcu-page-table-freeing
+++ a/arch/sparc/Kconfig
@@ -53,6 +53,7 @@ config SPARC64
select HAVE_PERF_EVENTS
select PERF_USE_VMALLOC
select IRQ_PREFLOW_FASTEOI
+ select HAVE_RCU_TABLE_FREE if SMP
config ARCH_DEFCONFIG
string
diff -puN arch/sparc/include/asm/pgalloc_64.h~sparc64-use-rcu-page-table-freeing arch/sparc/include/asm/pgalloc_64.h
--- a/arch/sparc/include/asm/pgalloc_64.h~sparc64-use-rcu-page-table-freeing
+++ a/arch/sparc/include/asm/pgalloc_64.h
@@ -76,7 +76,51 @@ static inline void pte_free(struct mm_st
#define check_pgt_cache() do { } while (0)
-#define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, pte)
-#define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tlb)->mm, pmd)
+static inline void pgtable_free(void *table, bool is_page)
+{
+ if (is_page)
+ free_page((unsigned long)table);
+ else
+ kmem_cache_free(pgtable_cache, table);
+}
+
+#ifdef CONFIG_SMP
+
+struct mmu_gather;
+extern void tlb_remove_table(struct mmu_gather *, void *);
+
+static inline void pgtable_free_tlb(struct mmu_gather *tlb, void *table, bool is_page)
+{
+ unsigned long pgf = (unsigned long)table;
+ if (is_page)
+ pgf |= 0x1UL;
+ tlb_remove_table(tlb, (void *)pgf);
+}
+
+static inline void __tlb_remove_table(void *_table)
+{
+ void *table = (void *)((unsigned long)_table & ~0x1UL);
+ bool is_page = false;
+
+ if ((unsigned long)_table & 0x1UL)
+ is_page = true;
+ pgtable_free(table, is_page);
+}
+#else /* CONFIG_SMP */
+static inline void pgtable_free_tlb(struct mmu_gather *tlb, void *table, bool is_page)
+{
+ pgtable_free(table, is_page);
+}
+#endif /* !CONFIG_SMP */
+
+static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *ptepage,
+ unsigned long address)
+{
+ pgtable_page_dtor(ptepage);
+ pgtable_free_tlb(tlb, page_address(ptepage), true);
+}
+
+#define __pmd_free_tlb(tlb, pmd, addr) \
+ pgtable_free_tlb(tlb, pmd, false)
#endif /* _SPARC64_PGALLOC_H */
_
Patches currently in -mm which might be from davem@xxxxxxxxxxxxx are
linux-next.patch
maintainers-orphan-framerelay-dlci.patch
drivers-net-skgec-support-dlink-dge-530t-rev-c1.patch
pci-make-the-struct-pci_dev-argument-of-pci_fixup_irqs-const.patch
sparc-exec-remove-redundant-addr_limit-assignment.patch
sparc64-kill-page-table-quicklists.patch
sparc64-use-rcu-page-table-freeing.patch
sparc64-add-support-for-_page_special.patch
sparc64-implement-get_user_pages_fast.patch
kprobes-silence-debug_strict_user_copy_checks=y-warning.patch
notifiers-cpu-move-cpu-notifiers-into-cpuh.patch
notifiers-net-move-netdevice-notifiers-into-netdeviceh.patch
notifiers-sys-move-reboot-notifiers-into-rebooth.patch
notifiers-pm-move-pm-notifiers-into-suspendh.patch
notifiers-pm-move-pm-notifiers-into-suspendh-update.patch
notifiers-vt-move-vt-notifiers-into-vth.patch
atomic-use-linux-atomich.patch
atomic-move-atomic_add_unless-to-generic-code.patch
atomic-cleanup-asm-generic-atomich-inclusion.patch
atomic-update-comments-in-atomich.patch
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