asm-generic: provide entirely generic nommu uaccess
Move the code to implement uaccess using memcpy or direct loads and stores to asm-generic/uaccess.h and make it selectable kconfig option. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Родитель
c67fdc1f00
Коммит
bd79f94758
|
@ -23,6 +23,7 @@ config H8300
|
|||
select HAVE_ARCH_KGDB
|
||||
select HAVE_ARCH_HASH
|
||||
select CPU_NO_EFFICIENT_FFS
|
||||
select UACCESS_MEMCPY
|
||||
|
||||
config CPU_BIG_ENDIAN
|
||||
def_bool y
|
||||
|
|
|
@ -46,6 +46,7 @@ generic-y += timex.h
|
|||
generic-y += tlbflush.h
|
||||
generic-y += topology.h
|
||||
generic-y += trace_clock.h
|
||||
generic-y += uaccess.h
|
||||
generic-y += unaligned.h
|
||||
generic-y += vga.h
|
||||
generic-y += word-at-a-time.h
|
||||
|
|
|
@ -1,55 +0,0 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
#ifndef _ASM_UACCESS_H
|
||||
#define _ASM_UACCESS_H
|
||||
|
||||
#include <linux/string.h>
|
||||
|
||||
static inline __must_check unsigned long
|
||||
raw_copy_from_user(void *to, const void __user * from, unsigned long n)
|
||||
{
|
||||
if (__builtin_constant_p(n)) {
|
||||
switch(n) {
|
||||
case 1:
|
||||
*(u8 *)to = *(u8 __force *)from;
|
||||
return 0;
|
||||
case 2:
|
||||
*(u16 *)to = *(u16 __force *)from;
|
||||
return 0;
|
||||
case 4:
|
||||
*(u32 *)to = *(u32 __force *)from;
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
memcpy(to, (const void __force *)from, n);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline __must_check unsigned long
|
||||
raw_copy_to_user(void __user *to, const void *from, unsigned long n)
|
||||
{
|
||||
if (__builtin_constant_p(n)) {
|
||||
switch(n) {
|
||||
case 1:
|
||||
*(u8 __force *)to = *(u8 *)from;
|
||||
return 0;
|
||||
case 2:
|
||||
*(u16 __force *)to = *(u16 *)from;
|
||||
return 0;
|
||||
case 4:
|
||||
*(u32 __force *)to = *(u32 *)from;
|
||||
return 0;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
memcpy((void __force *)to, from, n);
|
||||
return 0;
|
||||
}
|
||||
#define INLINE_COPY_FROM_USER
|
||||
#define INLINE_COPY_TO_USER
|
||||
|
||||
#include <asm-generic/uaccess.h>
|
||||
|
||||
#endif
|
|
@ -9,6 +9,54 @@
|
|||
*/
|
||||
#include <linux/string.h>
|
||||
|
||||
#ifdef CONFIG_UACCESS_MEMCPY
|
||||
static inline __must_check unsigned long
|
||||
raw_copy_from_user(void *to, const void __user * from, unsigned long n)
|
||||
{
|
||||
if (__builtin_constant_p(n)) {
|
||||
switch(n) {
|
||||
case 1:
|
||||
*(u8 *)to = *(u8 __force *)from;
|
||||
return 0;
|
||||
case 2:
|
||||
*(u16 *)to = *(u16 __force *)from;
|
||||
return 0;
|
||||
case 4:
|
||||
*(u32 *)to = *(u32 __force *)from;
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
memcpy(to, (const void __force *)from, n);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static inline __must_check unsigned long
|
||||
raw_copy_to_user(void __user *to, const void *from, unsigned long n)
|
||||
{
|
||||
if (__builtin_constant_p(n)) {
|
||||
switch(n) {
|
||||
case 1:
|
||||
*(u8 __force *)to = *(u8 *)from;
|
||||
return 0;
|
||||
case 2:
|
||||
*(u16 __force *)to = *(u16 *)from;
|
||||
return 0;
|
||||
case 4:
|
||||
*(u32 __force *)to = *(u32 *)from;
|
||||
return 0;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
memcpy((void __force *)to, from, n);
|
||||
return 0;
|
||||
}
|
||||
#define INLINE_COPY_FROM_USER
|
||||
#define INLINE_COPY_TO_USER
|
||||
#endif /* CONFIG_UACCESS_MEMCPY */
|
||||
|
||||
#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
|
||||
|
||||
#ifndef KERNEL_DS
|
||||
|
|
|
@ -591,6 +591,10 @@ config ARCH_NO_SG_CHAIN
|
|||
config ARCH_HAS_PMEM_API
|
||||
bool
|
||||
|
||||
# use memcpy to implement user copies for nommu architectures
|
||||
config UACCESS_MEMCPY
|
||||
bool
|
||||
|
||||
config ARCH_HAS_UACCESS_FLUSHCACHE
|
||||
bool
|
||||
|
||||
|
|
Загрузка…
Ссылка в новой задаче