[PATCH v2 2/2] mm/mmu_gather: send tlb_remove_table_smp_sync IPI only to MM CPUs

@@ -222,7 +222,7 @@ extern void tlb_remove_table(struct mmu_gather *tlb, void *table);
 #define tlb_needs_table_invalidate() (true)
 #endif
 
-void tlb_remove_table_sync_one(void);
+void tlb_remove_table_sync_one(struct mm_struct *mm);
 
 #else
 

@@ -230,7 +230,7 @@ void tlb_remove_table_sync_one(void);
 #error tlb_needs_table_invalidate() requires MMU_GATHER_RCU_TABLE_FREE
 #endif
 
-static inline void tlb_remove_table_sync_one(void) { }
+static inline void tlb_remove_table_sync_one(struct mm_struct *mm) { }
 
 #endif /* CONFIG_MMU_GATHER_RCU_TABLE_FREE */
 

@@ -1166,7 +1166,7 @@ static int collapse_huge_page(struct mm_struct *mm, unsigned long address,
 	_pmd = pmdp_collapse_flush(vma, address, pmd);
 	spin_unlock(pmd_ptl);
 	mmu_notifier_invalidate_range_end(&range);
-	tlb_remove_table_sync_one();
+	tlb_remove_table_sync_one(mm);
 
 	spin_lock(pte_ptl);
 	result =  __collapse_huge_page_isolate(vma, address, pte, cc,

@@ -1525,7 +1525,7 @@ static void collapse_and_free_pmd(struct mm_struct *mm, struct vm_area_struct *v
 				addr + HPAGE_PMD_SIZE);
 	mmu_notifier_invalidate_range_start(&range);
 	pmd = pmdp_collapse_flush(vma, addr, pmdp);
-	tlb_remove_table_sync_one();
+	tlb_remove_table_sync_one(mm);
 	mmu_notifier_invalidate_range_end(&range);
 	mm_dec_nr_ptes(mm);
 	page_table_check_pte_clear_range(mm, addr, pmd);

@@ -191,7 +191,13 @@ static void tlb_remove_table_smp_sync(void *arg)
 	/* Simply deliver the interrupt */
 }
 
-void tlb_remove_table_sync_one(void)
+#ifdef CONFIG_ARCH_HAS_CPUMASK_BITS
+#define REMOVE_TABLE_IPI_MASK mm_cpumask(mm)
+#else
+#define REMOVE_TABLE_IPI_MASK cpu_online_mask
+#endif /* CONFIG_ARCH_HAS_CPUMASK_BITS */
+
+void tlb_remove_table_sync_one(struct mm_struct *mm)
 {
 	/*
 	 * This isn't an RCU grace period and hence the page-tables cannot be

@@ -200,7 +206,8 @@ void tlb_remove_table_sync_one(void)
 	 * It is however sufficient for software page-table walkers that rely on
 	 * IRQ disabling.
 	 */
-	smp_call_function(tlb_remove_table_smp_sync, NULL, 1);
+	on_each_cpu_mask(REMOVE_TABLE_IPI_MASK, tlb_remove_table_smp_sync,
+			NULL, true);
 }
 
 static void tlb_remove_table_rcu(struct rcu_head *head)

@@ -237,9 +244,9 @@ static inline void tlb_table_invalidate(struct mmu_gather *tlb)
 	}
 }
 
-static void tlb_remove_table_one(void *table)
+static void tlb_remove_table_one(struct mm_struct *mm, void *table)
 {
-	tlb_remove_table_sync_one();
+	tlb_remove_table_sync_one(mm);
 	__tlb_remove_table(table);
 }
 

@@ -262,7 +269,7 @@ void tlb_remove_table(struct mmu_gather *tlb, void *table)
 		*batch = (struct mmu_table_batch *)__get_free_page(GFP_NOWAIT | __GFP_NOWARN);
 		if (*batch == NULL) {
 			tlb_table_invalidate(tlb);
-			tlb_remove_table_one(table);
+			tlb_remove_table_one(tlb->mm, table);
 			return;
 		}
 		(*batch)->nr = 0;