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Merge tag 'riscv-for-linus-5.10-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

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Pull more RISC-V updates from Palmer Dabbelt:
 "Just a single patch set: the remainder of Christoph's work to remove
  set_fs, including the RISC-V portion"

* tag 'riscv-for-linus-5.10-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  riscv: remove address space overrides using set_fs()
  riscv: implement __get_kernel_nofault and __put_user_nofault
  riscv: refactor __get_user and __put_user
  riscv: use memcpy based uaccess for nommu again
  asm-generic: make the set_fs implementation optional
  asm-generic: add nommu implementations of __{get,put}_kernel_nofault
  asm-generic: improve the nommu {get,put}_user handling
  uaccess: provide a generic TASK_SIZE_MAX definition
This commit is contained in:
Linus Torvalds
2020-10-24 10:57:57 -07:00
parent 45fe605832 e8d444d3e9
commit 0593c1b459
7 changed files with 166 additions and 135 deletions
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109
include/asm-generic/uaccess.h
View File

@@ -10,28 +10,76 @@
#include <linux/string.h>
#ifdef CONFIG_UACCESS_MEMCPY
#include <asm/unaligned.h>
static inline int __get_user_fn(size_t size, const void __user *from, void *to)
{
BUILD_BUG_ON(!__builtin_constant_p(size));
switch (size) {
case 1:
*(u8 *)to = get_unaligned((u8 __force *)from);
return 0;
case 2:
*(u16 *)to = get_unaligned((u16 __force *)from);
return 0;
case 4:
*(u32 *)to = get_unaligned((u32 __force *)from);
return 0;
case 8:
*(u64 *)to = get_unaligned((u64 __force *)from);
return 0;
default:
BUILD_BUG();
return 0;
}
}
#define __get_user_fn(sz, u, k) __get_user_fn(sz, u, k)
static inline int __put_user_fn(size_t size, void __user *to, void *from)
{
BUILD_BUG_ON(!__builtin_constant_p(size));
switch (size) {
case 1:
put_unaligned(*(u8 *)from, (u8 __force *)to);
return 0;
case 2:
put_unaligned(*(u16 *)from, (u16 __force *)to);
return 0;
case 4:
put_unaligned(*(u32 *)from, (u32 __force *)to);
return 0;
case 8:
put_unaligned(*(u64 *)from, (u64 __force *)to);
return 0;
default:
BUILD_BUG();
return 0;
}
}
#define __put_user_fn(sz, u, k) __put_user_fn(sz, u, k)
#define __get_kernel_nofault(dst, src, type, err_label) \
do { \
*((type *)dst) = get_unaligned((type *)(src)); \
if (0) /* make sure the label looks used to the compiler */ \
goto err_label; \
} while (0)
#define __put_kernel_nofault(dst, src, type, err_label) \
do { \
put_unaligned(*((type *)src), (type *)(dst)); \
if (0) /* make sure the label looks used to the compiler */ \
goto err_label; \
} while (0)
#define HAVE_GET_KERNEL_NOFAULT 1
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;
#ifdef CONFIG_64BIT
case 8:
*(u64 *)to = *(u64 __force *)from;
return 0;
#endif
}
}
memcpy(to, (const void __force *)from, n);
return 0;
}
@@ -39,27 +87,6 @@ raw_copy_from_user(void *to, const void __user * from, unsigned long n)
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;
#ifdef CONFIG_64BIT
case 8:
*(u64 __force *)to = *(u64 *)from;
return 0;
#endif
default:
break;
}
}
memcpy((void __force *)to, from, n);
return 0;
}
@@ -67,6 +94,7 @@ raw_copy_to_user(void __user *to, const void *from, unsigned long n)
#define INLINE_COPY_TO_USER
#endif /* CONFIG_UACCESS_MEMCPY */
#ifdef CONFIG_SET_FS
#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
#ifndef KERNEL_DS
@@ -89,6 +117,7 @@ static inline void set_fs(mm_segment_t fs)
#ifndef uaccess_kernel
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
#endif
#endif /* CONFIG_SET_FS */
#define access_ok(addr, size) __access_ok((unsigned long)(addr),(size))