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sched/tune: add sysctl interface to define a boost value
[firefly-linux-kernel-4.4.55.git]
/
lib
/
strncpy_from_user.c
diff --git
a/lib/strncpy_from_user.c
b/lib/strncpy_from_user.c
index e0af6ff73d146cfa3356080ebcb1bbea36cd1f96..5a003a2ebd967cfe6a9e202ea9a1ae7f1ddf1aba 100644
(file)
--- a/
lib/strncpy_from_user.c
+++ b/
lib/strncpy_from_user.c
@@
-39,8
+39,8
@@
static inline long do_strncpy_from_user(char *dst, const char __user *src, long
unsigned long c, data;
/* Fall back to byte-at-a-time if we get a page fault */
unsigned long c, data;
/* Fall back to byte-at-a-time if we get a page fault */
- if (unlikely(__get_user(c,(unsigned long __user *)(src+res))))
- break;
+ unsafe_get_user(c, (unsigned long __user *)(src+res), byte_at_a_time);
+
*(unsigned long *)(dst+res) = c;
if (has_zero(c, &data, &constants)) {
data = prep_zero_mask(c, data, &constants);
*(unsigned long *)(dst+res) = c;
if (has_zero(c, &data, &constants)) {
data = prep_zero_mask(c, data, &constants);
@@
-55,8
+55,7
@@
byte_at_a_time:
while (max) {
char c;
while (max) {
char c;
- if (unlikely(__get_user(c,src+res)))
- return -EFAULT;
+ unsafe_get_user(c,src+res, efault);
dst[res] = c;
if (!c)
return res;
dst[res] = c;
if (!c)
return res;
@@
-75,6
+74,7
@@
byte_at_a_time:
* Nope: we hit the address space limit, and we still had more
* characters the caller would have wanted. That's an EFAULT.
*/
* Nope: we hit the address space limit, and we still had more
* characters the caller would have wanted. That's an EFAULT.
*/
+efault:
return -EFAULT;
}
return -EFAULT;
}
@@
-107,7
+107,12
@@
long strncpy_from_user(char *dst, const char __user *src, long count)
src_addr = (unsigned long)src;
if (likely(src_addr < max_addr)) {
unsigned long max = max_addr - src_addr;
src_addr = (unsigned long)src;
if (likely(src_addr < max_addr)) {
unsigned long max = max_addr - src_addr;
- return do_strncpy_from_user(dst, src, count, max);
+ long retval;
+
+ user_access_begin();
+ retval = do_strncpy_from_user(dst, src, count, max);
+ user_access_end();
+ return retval;
}
return -EFAULT;
}
}
return -EFAULT;
}