uml: more page fault path trimming

16dd07bc · Jeff Dike <[email protected]> · 2007-05-06 14:51:48 -07:00

More trimming of the page fault path.

Permissions are passed around in a single int rather than one bit per
int.  The permission values are copied from libc so that they can be
passed to mmap and mprotect without any further conversion.

The register sets used by do_syscall_stub and copy_context_skas0 are
initialized once, at boot time, rather than once per call.

wait_stub_done checks whether it is getting the signals it expects by
comparing the wait status to a mask containing bits for the signals of
interest rather than comparing individually to the signal numbers.  It
also has one check for a wait failure instead of two.  The caller is
expected to do the initial continue of the stub.  This gets rid of an
argument and some logic.  The fname argument is gone, as that can be
had from a stack trace.

user_signal() is collapsed into userspace() as it is basically one or
two lines of code afterwards.

The physical memory remapping stuff is gone, as it is unused.

flush_tlb_page is inlined.

Signed-off-by: Jeff Dike <[email protected]>
Cc: Paolo 'Blaisorblade' Giarrusso <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Commit: 16dd07bc6404c8da0bdfeb7a5cde4e4a63991c00
Parents: 3ec704e6

Changes

12 files changed · +158 −378

File	Status	Add	Del	Content
arch/um/include/os.h	modified	+2	−4	View file
arch/um/include/tlb.h	modified	+2	−6	View file
arch/um/kernel/physmem.c	modified	+1	−227	View file
arch/um/kernel/skas/tlb.c	modified	+11	−10	View file
arch/um/kernel/tlb.c	modified	+14	−28	View file
arch/um/os-Linux/skas/mem.c	modified	+29	−22	View file
arch/um/os-Linux/skas/process.c	modified	+74	−48	View file
arch/um/os-Linux/skas/trap.c	modified	+0	−17	View file
arch/um/sys-i386/user-offsets.c	modified	+7	−2	View file
arch/um/sys-x86_64/user-offsets.c	modified	+5	−0	View file
include/asm-um/page.h	modified	+0	−3	View file
include/asm-um/tlbflush.h	modified	+13	−11	View file

Only the first 600 diff lines are shown. Download the complete patch.

arch/um/include/os.h

View file

diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index e11bdcd..688d181 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -300,13 +300,12 @@ extern long syscall_stub_data(struct mm_id * mm_idp,
 			      unsigned long *data, int data_count,
 			      void **addr, void **stub_addr);
 extern int map(struct mm_id * mm_idp, unsigned long virt,
-	       unsigned long len, int r, int w, int x, int phys_fd,
+	       unsigned long len, int prot, int phys_fd,
 	       unsigned long long offset, int done, void **data);
 extern int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
 		 int done, void **data);
 extern int protect(struct mm_id * mm_idp, unsigned long addr,
-		   unsigned long len, int r, int w, int x, int done,
-		   void **data);
+		   unsigned long len, unsigned int prot, int done, void **data);
 
 /* skas/process.c */
 extern int is_skas_winch(int pid, int fd, void *data);
@@ -342,7 +341,6 @@ extern void maybe_sigio_broken(int fd, int read);
 
 /* skas/trap */
 extern void sig_handler_common_skas(int sig, void *sc_ptr);
-extern void user_signal(int sig, union uml_pt_regs *regs, int pid);
 
 /* sys-x86_64/prctl.c */
 extern int os_arch_prctl(int pid, int code, unsigned long *addr);

arch/um/include/tlb.h

View file

diff --git a/arch/um/include/tlb.h b/arch/um/include/tlb.h
index 8efc1e0..bcd1a4a 100644
--- a/arch/um/include/tlb.h
+++ b/arch/um/include/tlb.h
@@ -14,9 +14,7 @@ struct host_vm_op {
 		struct {
 			unsigned long addr;
 			unsigned long len;
-			unsigned int r:1;
-			unsigned int w:1;
-			unsigned int x:1;
+			unsigned int prot;
 			int fd;
 			__u64 offset;
 		} mmap;
@@ -27,9 +25,7 @@ struct host_vm_op {
 		struct {
 			unsigned long addr;
 			unsigned long len;
-			unsigned int r:1;
-			unsigned int w:1;
-			unsigned int x:1;
+			unsigned int prot;
 		} mprotect;
 	} u;
 };

arch/um/kernel/physmem.c

View file

diff --git a/arch/um/kernel/physmem.c b/arch/um/kernel/physmem.c
index df1ad3b..3ba6e4c 100644
--- a/arch/um/kernel/physmem.c
+++ b/arch/um/kernel/physmem.c
@@ -21,229 +21,8 @@
 #include "kern.h"
 #include "init.h"
 
-struct phys_desc {
-	struct rb_node rb;
-	int fd;
-	__u64 offset;
-	void *virt;
-	unsigned long phys;
-	struct list_head list;
-};
-
-static struct rb_root phys_mappings = RB_ROOT;
-
-static struct rb_node **find_rb(void *virt)
-{
-	struct rb_node **n = &phys_mappings.rb_node;
-	struct phys_desc *d;
-
-	while(*n != NULL){
-		d = rb_entry(*n, struct phys_desc, rb);
-		if(d->virt == virt)
-			return n;
-
-		if(d->virt > virt)
-			n = &(*n)->rb_left;
-		else
-			n = &(*n)->rb_right;
-	}
-
-	return n;
-}
-
-static struct phys_desc *find_phys_mapping(void *virt)
-{
-	struct rb_node **n = find_rb(virt);
-
-	if(*n == NULL)
-		return NULL;
-
-	return rb_entry(*n, struct phys_desc, rb);
-}
-
-static void insert_phys_mapping(struct phys_desc *desc)
-{
-	struct rb_node **n = find_rb(desc->virt);
-
-	if(*n != NULL)
-		panic("Physical remapping for %p already present",
-		      desc->virt);
-
-	rb_link_node(&desc->rb, rb_parent(*n), n);
-	rb_insert_color(&desc->rb, &phys_mappings);
-}
-
-LIST_HEAD(descriptor_mappings);
-
-struct desc_mapping {
-	int fd;
-	struct list_head list;
-	struct list_head pages;
-};
-
-static struct desc_mapping *find_mapping(int fd)
-{
-	struct desc_mapping *desc;
-	struct list_head *ele;
-
-	list_for_each(ele, &descriptor_mappings){
-		desc = list_entry(ele, struct desc_mapping, list);
-		if(desc->fd == fd)
-			return desc;
-	}
-
-	return NULL;
-}
-
-static struct desc_mapping *descriptor_mapping(int fd)
-{
-	struct desc_mapping *desc;
-
-	desc = find_mapping(fd);
-	if(desc != NULL)
-		return desc;
-
-	desc = kmalloc(sizeof(*desc), GFP_ATOMIC);
-	if(desc == NULL)
-		return NULL;
-
-	*desc = ((struct desc_mapping)
-		{ .fd =		fd,
-		  .list =	LIST_HEAD_INIT(desc->list),
-		  .pages =	LIST_HEAD_INIT(desc->pages) });
-	list_add(&desc->list, &descriptor_mappings);
-
-	return desc;
-}
-
-int physmem_subst_mapping(void *virt, int fd, __u64 offset, int w)
-{
-	struct desc_mapping *fd_maps;
-	struct phys_desc *desc;
-	unsigned long phys;
-	int err;
-
-	fd_maps = descriptor_mapping(fd);
-	if(fd_maps == NULL)
-		return -ENOMEM;
-
-	phys = __pa(virt);
-	desc = find_phys_mapping(virt);
-	if(desc != NULL)
-		panic("Address 0x%p is already substituted\n", virt);
-
-	err = -ENOMEM;
-	desc = kmalloc(sizeof(*desc), GFP_ATOMIC);
-	if(desc == NULL)
-		goto out;
-
-	*desc = ((struct phys_desc)
-		{ .fd =			fd,
-		  .offset =		offset,
-		  .virt =		virt,
-		  .phys =		__pa(virt),
-		  .list = 		LIST_HEAD_INIT(desc->list) });
-	insert_phys_mapping(desc);
-
-	list_add(&desc->list, &fd_maps->pages);
-
-	virt = (void *) ((unsigned long) virt & PAGE_MASK);
-	err = os_map_memory(virt, fd, offset, PAGE_SIZE, 1, w, 0);
-	if(!err)
-		goto out;
-
-	rb_erase(&desc->rb, &phys_mappings);
-	kfree(desc);
- out:
-	return err;
-}
-
 static int physmem_fd = -1;
 
-static void remove_mapping(struct phys_desc *desc)
-{
-	void *virt = desc->virt;
-	int err;
-
-	rb_erase(&desc->rb, &phys_mappings);
-	list_del(&desc->list);
-	kfree(desc);
-
-	err = os_map_memory(virt, physmem_fd, __pa(virt), PAGE_SIZE, 1, 1, 0);
-	if(err)
-		panic("Failed to unmap block device page from physical memory, "
-		      "errno = %d", -err);
-}
-
-int physmem_remove_mapping(void *virt)
-{
-	struct phys_desc *desc;
-
-	virt = (void *) ((unsigned long) virt & PAGE_MASK);
-	desc = find_phys_mapping(virt);
-	if(desc == NULL)
-		return 0;
-
-	remove_mapping(desc);
-	return 1;
-}
-
-void physmem_forget_descriptor(int fd)
-{
-	struct desc_mapping *desc;
-	struct phys_desc *page;
-	struct list_head *ele, *next;
-	__u64 offset;
-	void *addr;
-	int err;
-
-	desc = find_mapping(fd);
-	if(desc == NULL)
-		return;
-
-	list_for_each_safe(ele, next, &desc->pages){
-		page = list_entry(ele, struct phys_desc, list);
-		offset = page->offset;
-		addr = page->virt;
-		remove_mapping(page);
-		err = os_seek_file(fd, offset);
-		if(err)
-			panic("physmem_forget_descriptor - failed to seek "
-			      "to %lld in fd %d, error = %d\n",
-			      offset, fd, -err);
-		err = os_read_file(fd, addr, PAGE_SIZE);
-		if(err < 0)
-			panic("physmem_forget_descriptor - failed to read "
-			      "from fd %d to 0x%p, error = %d\n",
-			      fd, addr, -err);
-	}
-
-	list_del(&desc->list);
-	kfree(desc);
-}
-
-EXPORT_SYMBOL(physmem_forget_descriptor);
-EXPORT_SYMBOL(physmem_remove_mapping);
-EXPORT_SYMBOL(physmem_subst_mapping);
-
-void arch_free_page(struct page *page, int order)
-{
-	void *virt;
-	int i;
-
-	for(i = 0; i < (1 << order); i++){
-		virt = __va(page_to_phys(page + i));
-		physmem_remove_mapping(virt);
-	}
-}
-
-int is_remapped(void *virt)
-{
- 	struct phys_desc *desc = find_phys_mapping(virt);
-
-	return desc != NULL;
-}
-
 /* Changed during early boot */
 unsigned long high_physmem;
 
@@ -350,14 +129,9 @@ void setup_physmem(unsigned long start, unsigned long reserve_end,
 
 int phys_mapping(unsigned long phys, __u64 *offset_out)
 {
-	struct phys_desc *desc = find_phys_mapping(__va(phys & PAGE_MASK));
 	int fd = -1;
 
-	if(desc != NULL){
-		fd = desc->fd;
-		*offset_out = desc->offset;
-	}
-	else if(phys < physmem_size){
+	if(phys < physmem_size){
 		fd = physmem_fd;
 		*offset_out = phys;
 	}

arch/um/kernel/skas/tlb.c

View file

diff --git a/arch/um/kernel/skas/tlb.c b/arch/um/kernel/skas/tlb.c
index c43901a..b3d722d 100644
--- a/arch/um/kernel/skas/tlb.c
+++ b/arch/um/kernel/skas/tlb.c
@@ -27,9 +27,9 @@ static int do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,
 		switch(op->type){
 		case MMAP:
 			ret = map(&mmu->skas.id, op->u.mmap.addr,
-				  op->u.mmap.len, op->u.mmap.r, op->u.mmap.w,
-				  op->u.mmap.x, op->u.mmap.fd,
-				  op->u.mmap.offset, finished, flush);
+				  op->u.mmap.len, op->u.mmap.prot,
+				  op->u.mmap.fd, op->u.mmap.offset, finished,
+				  flush);
 			break;
 		case MUNMAP:
 			ret = unmap(&mmu->skas.id, op->u.munmap.addr,
@@ -37,8 +37,7 @@ static int do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,
 			break;
 		case MPROTECT:
 			ret = protect(&mmu->skas.id, op->u.mprotect.addr,
-				      op->u.mprotect.len, op->u.mprotect.r,
-				      op->u.mprotect.w, op->u.mprotect.x,
+				      op->u.mprotect.len, op->u.mprotect.prot,
 				      finished, flush);
 			break;
 		default:
@@ -102,10 +101,10 @@ void flush_tlb_page_skas(struct vm_area_struct *vma, unsigned long address)
 	pte_t *pte;
 	struct mm_struct *mm = vma->vm_mm;
 	void *flush = NULL;
-	int r, w, x, err = 0;
+	int r, w, x, prot, err = 0;
 	struct mm_id *mm_id;
 
-	pgd = pgd_offset(vma->vm_mm, address);
+	pgd = pgd_offset(mm, address);
 	if(!pgd_present(*pgd))
 		goto kill;
 
@@ -130,19 +129,21 @@ void flush_tlb_page_skas(struct vm_area_struct *vma, unsigned long address)
 	}
 
 	mm_id = &mm->context.skas.id;
+	prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
+		(x ? UM_PROT_EXEC : 0));
 	if(pte_newpage(*pte)){
 		if(pte_present(*pte)){
 			unsigned long long offset;
 			int fd;
 
 			fd = phys_mapping(pte_val(*pte) & PAGE_MASK, &offset);
-			err = map(mm_id, address, PAGE_SIZE, r, w, x, fd,
-				  offset, 1, &flush);
+			err = map(mm_id, address, PAGE_SIZE, prot, fd, offset,
+				  1, &flush);
 		}
 		else err = unmap(mm_id, address, PAGE_SIZE, 1, &flush);
 	}
 	else if(pte_newprot(*pte))
-		err = protect(mm_id, address, PAGE_SIZE, r, w, x, 1, &flush);
+		err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
 
 	if(err)
 		goto kill;

arch/um/kernel/tlb.c

View file

diff --git a/arch/um/kernel/tlb.c b/arch/um/kernel/tlb.c
index 4a39d50..8a8d528 100644
--- a/arch/um/kernel/tlb.c
+++ b/arch/um/kernel/tlb.c
@@ -17,7 +17,7 @@
 #include "os.h"
 
 static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
-		    int r, int w, int x, struct host_vm_op *ops, int *index,
+		    unsigned int prot, struct host_vm_op *ops, int *index,
 		    int last_filled, union mm_context *mmu, void **flush,
 		    int (*do_ops)(union mm_context *, struct host_vm_op *,
 				  int, int, void **))
@@ -31,8 +31,7 @@ static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
 		last = &ops[*index];
 		if((last->type == MMAP) &&
 		   (last->u.mmap.addr + last->u.mmap.len == virt) &&
-		   (last->u.mmap.r == r) && (last->u.mmap.w == w) &&
-		   (last->u.mmap.x == x) && (last->u.mmap.fd == fd) &&
+		   (last->u.mmap.prot == prot) && (last->u.mmap.fd == fd) &&
 		   (last->u.mmap.offset + last->u.mmap.len == offset)){
 			last->u.mmap.len += len;
 			return 0;
@@ -48,9 +47,7 @@ static int add_mmap(unsigned long virt, unsigned long phys, unsigned long len,
 			     			.u = { .mmap = {
 						       .addr	= virt,
 						       .len	= len,
-						       .r	= r,
-						       .w	= w,
-						       .x	= x,
+						       .prot	= prot,
 						       .fd	= fd,
 						       .offset	= offset }
 			   } });
@@ -87,8 +84,8 @@ static int add_munmap(unsigned long addr, unsigned long len,
 	return ret;
 }
 
-static int add_mprotect(unsigned long addr, unsigned long len, int r, int w,
-			int x, struct host_vm_op *ops, int *index,
+static int add_mprotect(unsigned long addr, unsigned long len,
+			unsigned int prot, struct host_vm_op *ops, int *index,
 			int last_filled, union mm_context *mmu, void **flush,
 			int (*do_ops)(union mm_context *, struct host_vm_op *,
 				      int, int, void **))
@@ -100,8 +97,7 @@ static int add_mprotect(unsigned long addr, unsigned long len, int r, int w,
 		last = &ops[*index];
 		if((last->type == MPROTECT) &&
 		   (last->u.mprotect.addr + last->u.mprotect.len == addr) &&
-		   (last->u.mprotect.r == r) && (last->u.mprotect.w == w) &&
-		   (last->u.mprotect.x == x)){
+		   (last->u.mprotect.prot == prot)){
 			last->u.mprotect.len += len;
 			return 0;
 		}
@@ -116,9 +112,7 @@ static int add_mprotect(unsigned long addr, unsigned long len, int r, int w,
 			     		       .u = { .mprotect = {
 						       .addr	= addr,
 						       .len	= len,
-						       .r	= r,
-						       .w	= w,
-						       .x	= x } } });
+						       .prot	= prot } } });
 	return ret;
 }
 
@@ -133,7 +127,7 @@ static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
 						 void **))
 {
 	pte_t *pte;
-	int r, w, x, ret = 0;
+	int r, w, x, prot, ret = 0;
 
 	pte = pte_offset_kernel(pmd, addr);
 	do {
@@ -146,19 +140,19 @@ static inline int update_pte_range(pmd_t *pmd, unsigned long addr,
 		} else if (!pte_dirty(*pte)) {
 			w = 0;
 		}
+		prot = ((r ? UM_PROT_READ : 0) | (w ? UM_PROT_WRITE : 0) |
+			(x ? UM_PROT_EXEC : 0));
 		if(force || pte_newpage(*pte)){
 			if(pte_present(*pte))
 				ret = add_mmap(addr, pte_val(*pte) & PAGE_MASK,
-					       PAGE_SIZE, r, w, x, ops,
-					       op_index, last_op, mmu, flush,
-					       do_ops);
+					       PAGE_SIZE, prot, ops, op_index,
+					       last_op, mmu, flush, do_ops);
 			else ret = add_munmap(addr, PAGE_SIZE, ops, op_index,
 					      last_op, mmu, flush, do_ops);
 		}
 		else if(pte_newprot(*pte))
-			ret = add_mprotect(addr, PAGE_SIZE, r, w, x, ops,
-					   op_index, last_op, mmu, flush,
-					   do_ops);
+			ret = add_mprotect(addr, PAGE_SIZE, prot, ops, op_index,
+					   last_op, mmu, flush, do_ops);
 		*pte = pte_mkuptodate(*pte);
 	} while (pte++, addr += PAGE_SIZE, ((addr != end) && !ret));
 	return ret;
@@ -377,14 +371,6 @@ pte_t *addr_pte(struct task_struct *task, unsigned long addr)
 	return(pte_offset_map(pmd, addr));
 }
 
-void flush_tlb_page(struct vm_area_struct *vma, unsigned long address)
-{
-	address &= PAGE_MASK;
-
-	CHOOSE_MODE(flush_tlb_range(vma, address, address + PAGE_SIZE),
-		    flush_tlb_page_skas(vma, address));
-}
-
 void flush_tlb_all(void)
 {
 	flush_tlb_mm(current->mm);

arch/um/os-Linux/skas/mem.c

View file

diff --git a/arch/um/os-Linux/skas/mem.c b/arch/um/os-Linux/skas/mem.c
index af07907..8e490ff 100644
--- a/arch/um/os-Linux/skas/mem.c
+++ b/arch/um/os-Linux/skas/mem.c
@@ -24,10 +24,11 @@
 #include "uml-config.h"
 #include "sysdep/ptrace.h"
 #include "sysdep/stub.h"
+#include "init.h"
 
 extern unsigned long batch_syscall_stub, __syscall_stub_start;
 
-extern void wait_stub_done(int pid, int sig, char * fname);
+extern void wait_stub_done(int pid);
 
 static inline unsigned long *check_init_stack(struct mm_id * mm_idp,
 					      unsigned long *stack)
@@ -39,6 +40,19 @@ static inline unsigned long *check_init_stack(struct mm_id * mm_idp,
 	return stack;
 }
 
+static unsigned long syscall_regs[MAX_REG_NR];
+
+static int __init init_syscall_regs(void)
+{
+	get_safe_registers(syscall_regs, NULL);
+	syscall_regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
+		((unsigned long) &batch_syscall_stub -
+		 (unsigned long) &__syscall_stub_start);
+	return 0;
+}
+
+__initcall(init_syscall_regs);
+
 extern int proc_mm;
 
 int single_count = 0;
@@ -47,12 +61,11 @@ int multi_op_count = 0;
 
 static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr)
 {
-	unsigned long regs[MAX_REG_NR];
 	int n, i;
 	long ret, offset;
 	unsigned long * data;
 	unsigned long * syscall;
-	int pid = mm_idp->u.pid;
+	int err, pid = mm_idp->u.pid;
 
 	if(proc_mm)
 #warning Need to look up userspace_pid by cpu
@@ -60,21 +73,21 @@ static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr)
 
 	multi_count++;
 
-	get_safe_registers(regs, NULL);
-	regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
-		((unsigned long) &batch_syscall_stub -
-		 (unsigned long) &__syscall_stub_start);
-
-	n = ptrace_setregs(pid, regs);
+	n = ptrace_setregs(pid, syscall_regs);
 	if(n < 0){
 		printk("Registers - \n");
 		for(i = 0; i < MAX_REG_NR; i++)
-			printk("\t%d\t0x%lx\n", i, regs[i]);
+			printk("\t%d\t0x%lx\n", i, syscall_regs[i]);
 		panic("do_syscall_stub : PTRACE_SETREGS failed, errno = %d\n",
 		      -n);
 	}
 
-	wait_stub_done(pid, 0, "do_syscall_stub");
+	err = ptrace(PTRACE_CONT, pid, 0, 0);
+	if(err)
+		panic("Failed to continue stub, pid = %d, errno = %d\n", pid,
+		      errno);
+
+	wait_stub_done(pid);
 
 	/* When the stub stops, we find the following values on the
 	 * beginning of the stack:
@@ -176,14 +189,10 @@ long syscall_stub_data(struct mm_id * mm_idp,
 	return 0;
 }
 
-int map(struct mm_id * mm_idp, unsigned long virt, unsigned long len,
-	int r, int w, int x, int phys_fd, unsigned long long offset,
-	int done, void **data)
+int map(struct mm_id * mm_idp, unsigned long virt, unsigned long len, int prot,
+	int phys_fd, unsigned long long offset, int done, void **data)
 {
-	int prot, ret;
-
-	prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
-		(x ? PROT_EXEC : 0);
+	int ret;
 
 	if(proc_mm){
 		struct proc_mm_op map;
@@ -253,13 +262,11 @@ int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
 }
 
 int protect(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
-	    int r, int w, int x, int done, void **data)
+	    unsigned int prot, int done, void **data)
 {
 	struct proc_mm_op protect;
-	int prot, ret;
+	int ret;
 
-	prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
-		(x ? PROT_EXEC : 0);
 	if(proc_mm){
 		int fd = mm_idp->u.mm_fd;
 

arch/um/os-Linux/skas/process.c

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arch/um/os-Linux/skas/trap.c

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arch/um/sys-i386/user-offsets.c

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arch/um/sys-x86_64/user-offsets.c

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include/asm-um/page.h

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include/asm-um/tlbflush.h

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