linux.git/arch/s390/lib, branch v6.5

s390: include linux/io.h instead of asm/io.h

2023-07-03T09:19:40+00:00

Include linux/io.h instead of asm/io.h everywhere. linux/io.h includes
asm/io.h, so this shouldn't cause any problems. Instead this might help for
some randconfig build errors which were reported due to some undefined io
related functions.

Also move the changed include so it stays grouped together with other
includes from the same directory.

For ctcm_mpc.c also remove not needed comments (actually questions).

Acked-by: Christian Borntraeger 
Signed-off-by: Heiko Carstens 
Signed-off-by: Alexander Gordeev

s390: select ARCH_SUPPORTS_INT128

2023-05-15T12:12:14+00:00

s390 has instructions to support 128 bit arithmetics, e.g. a 64 bit
multiply instruction with a 128 bit result. Also 128 bit integer
artithmetics are already used in s390 specific architecture code (see
e.g. read_persistent_clock64()).

Therefore select ARCH_SUPPORTS_INT128.

However limit this to clang for now, since gcc generates inefficient code,
which may lead to stack overflows, when compiling
lib/crypto/curve25519-hacl64.c which depends on ARCH_SUPPORTS_INT128. The
gcc generated functions have 6kb stack frames, compared to only 1kb of the
code generated with clang.

If the kernel is compiled with -Os library calls for __ashlti3(),
__ashrti3(), and __lshrti3() may be generated. Similar to arm64
and riscv provide assembler implementations for these functions.

Acked-by: Alexander Gordeev 
Signed-off-by: Heiko Carstens 
Signed-off-by: Alexander Gordeev

s390/lib: use SYM* macros instead of ENTRY(), etc.

2023-04-19T15:24:16+00:00

Consistently use the SYM* family of macros instead of the
deprecated ENTRY(), ENDPROC(), etc. family of macros.

Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/kasan: remove override of mem*() functions

2023-04-19T15:24:16+00:00

The kasan mem*() functions are not used anymore since s390 has switched
to GENERIC_ENTRY and commit 69d4c0d32186 ("entry, kasan, x86: Disallow
overriding mem*() functions").

Therefore remove the now dead code, similar to x86.
While at it also use the SYM* macros in mem.S.

Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/uaccess: remove extra blank line

2023-04-04T16:27:24+00:00

In order to get uaccess.c (nearly) checkpatch warning free remove an
extra blank line:

CHECK: Blank lines aren't necessary before a close brace '}'
+
+}

Reviewed-by: Gerald Schaefer 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/uaccess: get rid of not needed local variable

2023-04-04T16:27:24+00:00

Get rid of the not needed val local variable and pass the constant
value directly as operand value. In addition this turns the val
operand into an input operand, since it is not changed within the
inline assemblies.

This in turn requires also to add the earlyclobber contraint modifier
to all output operands, since the (former) val operand is used after
all output variants have been modified.

The usercopy kunit tests still pass after this change.

Reviewed-by: Gerald Schaefer 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/uaccess: rename tmp1 and tmp2 variables

2023-04-04T16:27:24+00:00

Rename tmp1 and tmp2 variables to more meaningful val (for value) and rem
(for remainder).

Except for debug sections the output of "objdump -Dr" of the uaccess object
file is identical before/after this change.

Reviewed-by: Gerald Schaefer 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/uaccess: sort EX_TABLE list for inline assemblies

2023-04-04T16:27:24+00:00

Reviewed-by: Gerald Schaefer 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/uaccess: rename/sort labels in inline assemblies

2023-04-04T16:27:24+00:00

Rename and sort labels in uaccess inline assemblies to increase
readability. In addition have only one EX_TABLE entry per line - also to
increase readability.

Except for debug sections the output of "objdump -Dr" of the uaccess object
file is identical before/after this change.

Reviewed-by: Gerald Schaefer 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/uaccess: remove unused label in inline assemblies

2023-04-04T16:27:24+00:00

Remove an unused label in all three uaccess inline assemblies.

Reviewed-by: Gerald Schaefer 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik