Remove (at least temporarily) the "incomplete PFN mapping" support (7fc7e2ee) · Commits · 戴 / test

include/linux/mm.h

+0 −1

Original line number	Diff line number	Diff line
		@@ -163,7 +163,6 @@ extern unsigned int kobjsize(const void *objp);
		#define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */
		#define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */
		#define VM_MAPPED_COPY 0x01000000 /* T if mapped copy of data (nommu mmap) */
		#define VM_INCOMPLETE 0x02000000 /* Strange partial PFN mapping marker */

		#ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */
		#define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS

+1 −45

Original line number	Diff line number	Diff line
		@@ -1227,50 +1227,6 @@ int vm_insert_page(struct vm_area_struct vma, unsigned long addr, struct page
		}
		EXPORT_SYMBOL(vm_insert_page);

		/*
		* Somebody does a pfn remapping that doesn't actually work as a vma.
		*
		* Do it as individual pages instead, and warn about it. It's bad form,
		* and very inefficient.
		*/
		static int incomplete_pfn_remap(struct vm_area_struct *vma,
		unsigned long start, unsigned long end,
		unsigned long pfn, pgprot_t prot)
		{
		static int warn = 10;
		struct page *page;
		int retval;

		if (!(vma->vm_flags & VM_INCOMPLETE)) {
		if (warn) {
		warn--;
		printk("%s does an incomplete pfn remapping", current->comm);
		dump_stack();
		}
		}
		vma->vm_flags \|= VM_INCOMPLETE \| VM_IO \| VM_RESERVED;

		if (start < vma->vm_start \|\| end > vma->vm_end)
		return -EINVAL;

		if (!pfn_valid(pfn))
		return -EINVAL;

		page = pfn_to_page(pfn);
		if (!PageReserved(page))
		return -EINVAL;

		retval = 0;
		while (start < end) {
		retval = insert_page(vma->vm_mm, start, page, prot);
		if (retval < 0)
		break;
		start += PAGE_SIZE;
		page++;
		}
		return retval;
		}

		/*
		* maps a range of physical memory into the requested pages. the old
		* mappings are removed. any references to nonexistent pages results
		@@ -1365,7 +1321,7 @@ int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
		*/
		if (!(vma->vm_flags & VM_SHARED)) {
		if (addr != vma->vm_start \|\| end != vma->vm_end)
		return incomplete_pfn_remap(vma, addr, end, pfn, prot);
		return -EINVAL;
		vma->vm_pgoff = pfn;
		}