kernel/linux.git/arch/s390/lib, branch v6.6.132

s390/xor: Fix xor_xc_2() inline assembly constraints

2026-03-25T10:06:01+00:00

commit f775276edc0c505dc0f782773796c189f31a1123 upstream. The inline assembly constraints for xor_xc_2() are incorrect. "bytes", "p1", and "p2" are input operands, while all three of them are modified within the inline assembly. Given that the function consists only of this inline assembly it seems unlikely that this may cause any problems, however fix this in any case. Fixes: 2cfc5f9ce7f5 ("s390/xor: optimized xor routing using the XC instruction") Cc: stable@vger.kernel.org Signed-off-by: Heiko Carstens Reviewed-by: Vasily Gorbik Link: https://lore.kernel.org/r/20260302133500.1560531-2-hca@linux.ibm.com Signed-off-by: Vasily Gorbik Signed-off-by: Greg Kroah-Hartman

s390: replace #include with #include

2023-08-09T13:20:50+00:00

Commit ddb5cdbafaaa ("kbuild: generate KSYMTAB entries by modpost") deprecated , which is now a wrapper of . Replace #include with #include . After all the lines are converted, and will be removed. Signed-off-by: Masahiro Yamada Link: https://lore.kernel.org/r/20230806151641.394720-2-masahiroy@kernel.org Signed-off-by: Heiko Carstens

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