mm: remove vmalloc_sync_(un)mappings() (73f693c3) · Commits · 戴 / test

arch/x86/mm/fault.c

+0 −37

Original line number	Diff line number	Diff line
		@@ -214,26 +214,6 @@ void arch_sync_kernel_mappings(unsigned long start, unsigned long end)
		}
		}

		static void vmalloc_sync(void)
		{
		unsigned long address;

		if (SHARED_KERNEL_PMD)
		return;

		arch_sync_kernel_mappings(VMALLOC_START, VMALLOC_END);
		}

		void vmalloc_sync_mappings(void)
		{
		vmalloc_sync();
		}

		void vmalloc_sync_unmappings(void)
		{
		vmalloc_sync();
		}

		/*
		* 32-bit:
		*
		@@ -336,23 +316,6 @@ out:

		#else /* CONFIG_X86_64: */

		void vmalloc_sync_mappings(void)
		{
		/*
		* 64-bit mappings might allocate new p4d/pud pages
		* that need to be propagated to all tasks' PGDs.
		*/
		sync_global_pgds(VMALLOC_START & PGDIR_MASK, VMALLOC_END);
		}

		void vmalloc_sync_unmappings(void)
		{
		/*
		* Unmappings never allocate or free p4d/pud pages.
		* No work is required here.
		*/
		}

		/*
		* 64-bit:
		*

+0 −6

Original line number	Diff line number	Diff line
		@@ -167,12 +167,6 @@ int ghes_estatus_pool_init(int num_ghes)
		if (!addr)
		goto err_pool_alloc;

		/*
		* New allocation must be visible in all pgd before it can be found by
		* an NMI allocating from the pool.
		*/
		vmalloc_sync_mappings();

		rc = gen_pool_add(ghes_estatus_pool, addr, PAGE_ALIGN(len), -1);
		if (rc)
		goto err_pool_add;

+0 −2

Original line number	Diff line number	Diff line
		@@ -130,8 +130,6 @@ extern int remap_vmalloc_range_partial(struct vm_area_struct *vma,

		extern int remap_vmalloc_range(struct vm_area_struct vma, void addr,
		unsigned long pgoff);
		void vmalloc_sync_mappings(void);
		void vmalloc_sync_unmappings(void);

		/*
		* Architectures can set this mask to a combination of PGTBL_P?D_MODIFIED values

+0 −1

Original line number	Diff line number	Diff line
		@@ -519,7 +519,6 @@ NOKPROBE_SYMBOL(notify_die);

		int register_die_notifier(struct notifier_block *nb)
		{
		vmalloc_sync_mappings();
		return atomic_notifier_chain_register(&die_chain, nb);
		}
		EXPORT_SYMBOL_GPL(register_die_notifier);

+0 −12

Original line number	Diff line number	Diff line
		@@ -8527,18 +8527,6 @@ static int allocate_trace_buffers(struct trace_array *tr, int size)
		allocate_snapshot = false;
		#endif

		/*
		* Because of some magic with the way alloc_percpu() works on
		* x86_64, we need to synchronize the pgd of all the tables,
		* otherwise the trace events that happen in x86_64 page fault
		* handlers can't cope with accessing the chance that a
		* alloc_percpu()'d memory might be touched in the page fault trace
		* event. Oh, and we need to audit all other alloc_percpu() and vmalloc()
		* calls in tracing, because something might get triggered within a
		* page fault trace event!
		*/
		vmalloc_sync_mappings();

		return 0;
		}