UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

powerpc/uaccess: get rid of small constant size cases in raw_copy_{to,from}_user() 

Copied from commit 4b842e4e25 ("x86: get rid of small
constant size cases in raw_copy_{to,from}_user()")

Very few call sites where that would be triggered remain, and none
of those is anywhere near hot enough to bother.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/99d4ccb58a20d8408d0e19874393655ad5b40822.1612879284.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-02-09 14:02:12 +00:00 committed by Michael Ellerman
parent e3de1e291f
commit 6b385d1d7c
1 changed files with 0 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
arch/powerpc/include/asm/uaccess.h
View File

@ -398,26 +398,6 @@ static inline unsigned long raw_copy_from_user(void *to,
const void __user *from, unsigned long n)
{
unsigned long ret;
if (__builtin_constant_p(n) && (n <= 8)) {
ret = 1;
switch (n) {
case 1:
__get_user_size(*(u8 *)to, from, 1, ret);
break;
case 2:
__get_user_size(*(u16 *)to, from, 2, ret);
break;
case 4:
__get_user_size(*(u32 *)to, from, 4, ret);
break;
case 8:
__get_user_size(*(u64 *)to, from, 8, ret);
break;
}
if (ret == 0)
return 0;
}
allow_read_from_user(from, n);
ret = __copy_tofrom_user((__force void __user *)to, from, n);
@ -428,27 +408,6 @@ static inline unsigned long raw_copy_from_user(void *to,
static inline unsigned long
raw_copy_to_user_allowed(void __user *to, const void *from, unsigned long n)
{
if (__builtin_constant_p(n) && (n <= 8)) {
unsigned long ret = 1;
switch (n) {
case 1:
__put_user_size_allowed(*(u8 *)from, (u8 __user *)to, 1, ret);
break;
case 2:
__put_user_size_allowed(*(u16 *)from, (u16 __user *)to, 2, ret);
break;
case 4:
__put_user_size_allowed(*(u32 *)from, (u32 __user *)to, 4, ret);
break;
case 8:
__put_user_size_allowed(*(u64 *)from, (u64 __user *)to, 8, ret);
break;
}
if (ret == 0)
return 0;
}
return __copy_tofrom_user(to, (__force const void __user *)from, n);
}