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s390/uaccess: Remove usage of the oac specifier

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Remove usage of the operand access control specifier for put_user()
and get_user() (again). Instead hardcode the specifier for both inline
assemblies. This saves one instruction.

Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2025-01-13 13:37:05 +01:00 committed by Alexander Gordeev
parent dc7ff4b8cb
commit 636d35aec5
1 changed files with 4 additions and 12 deletions
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16
arch/s390/include/asm/uaccess.h
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@ -92,14 +92,10 @@ __put_user_##type##_noinstr(unsigned type __user *to, \
unsigned type *from, \
unsigned long size) \
{ \
union oac __oac_spec = { \
.oac1.as = PSW_BITS_AS_SECONDARY, \
.oac1.a = 1, \
}; \
int rc; \
\
asm volatile( \
" lr %%r0,%[spec]\n" \
" llilh %%r0,%[spec]\n" \
"0: mvcos %[to],%[from],%[size]\n" \
"1: lhi %[rc],0\n" \
"2:\n" \
@ -107,7 +103,7 @@ __put_user_##type##_noinstr(unsigned type __user *to, \
EX_TABLE_UA_FAULT(1b, 2b, %[rc]) \
: [rc] "=d" (rc), [to] "+Q" (*to) \
: [size] "d" (size), [from] "Q" (*from), \
[spec] "d" (__oac_spec.val) \
[spec] "I" (0x81) \
: "cc", "0"); \
return rc; \
} \
@ -176,14 +172,10 @@ __get_user_##type##_noinstr(unsigned type *to, \
const unsigned type __user *from, \
unsigned long size) \
{ \
union oac __oac_spec = { \
.oac2.as = PSW_BITS_AS_SECONDARY, \
.oac2.a = 1, \
}; \
int rc; \
\
asm volatile( \
" lr %%r0,%[spec]\n" \
" lhi %%r0,%[spec]\n" \
"0: mvcos %[to],%[from],%[size]\n" \
"1: lhi %[rc],0\n" \
"2:\n" \
@ -191,7 +183,7 @@ __get_user_##type##_noinstr(unsigned type *to, \
EX_TABLE_UA_FAULT(1b, 2b, %[rc]) \
: [rc] "=d" (rc), [to] "=Q" (*to) \
: [size] "d" (size), [from] "Q" (*from), \
[spec] "d" (__oac_spec.val) \
[spec] "I" (0x81) \
: "cc", "0"); \
if (likely(!rc)) \
return 0; \