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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 <agordeev@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com> |
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| .. | ||
| expoline | ||
| delay.c | ||
| error-inject.c | ||
| find.c | ||
| Makefile | ||
| mem.S | ||
| probes.c | ||
| spinlock.c | ||
| string.c | ||
| test_kprobes_asm.S | ||
| test_kprobes.c | ||
| test_kprobes.h | ||
| test_modules_helpers.c | ||
| test_modules.c | ||
| test_modules.h | ||
| test_unwind.c | ||
| tishift.S | ||
| uaccess.c | ||
| xor.c | ||