kernel/linux.git/arch/s390/include/asm/asm.h, branch linux-7.0.y

s390/asm: Let __HAVE_ASM_FLAG_OUTPUTS__ define 1

2026-01-17T14:52:49+00:00

With the empty define __is_enabled(__HAVE_ASM_FLAG_OUTPUTS__) evaluates to false. Therefore let __HAVE_ASM_FLAG_OUTPUTS__ define 1 if it is defined. This allows to make use of __is_defined(__HAVE_ASM_FLAG_OUTPUTS__) like expected. Reviewed-by: Sven Schnelle Signed-off-by: Heiko Carstens

s390: Rename GCC_ASM_FLAG_OUTPUT_BROKEN to CC_ASM_FLAG_OUTPUT_BROKEN

2025-01-26T16:24:04+00:00

Config options which can be used to check for compiler bugs and features have the compiler independent CC prefix in order to avoid duplicating and having to check config options for multiple compilers. Therefore rename the config option accordingly. Reviewed-by: Alexander Gordeev Signed-off-by: Heiko Carstens Signed-off-by: Alexander Gordeev

s390/asm: Helper macros for flag output operand handling

2024-11-13T13:31:31+00:00

Since gcc supports flag out operands for inline assemblies there is always the question when this feature should be used and if it is worth all the ifdefs that come with that. In order to avoid that provide similar macros like x86 which can be used for all inline assemblies which extract the condition code. Depending on compiler features the generated code will either always contain an ipm+srl instruction pair, which extracts the condition code, or alternatively let the compiler handle this completely. Suggested-by: Juergen Christ Reviewed-by: Juergen Christ Signed-off-by: Heiko Carstens

s390/cmpxchg: Provide arch_try_cmpxchg()

2024-11-12T13:01:28+00:00

Since gcc 14 flag output operands are supported also for s390. Provide an arch_try_cmpxchg() implementation so that all existing try_cmpxchg() variants provide slightly better code, if compiled with gcc 14 or newer. Reviewed-by: Juergen Christ Signed-off-by: Heiko Carstens