From: Heiko Carstens <hca@linux.ibm.com>
To: Alexander Gordeev <agordeev@linux.ibm.com>,
Sven Schnelle <svens@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Mete Durlu <meted@linux.ibm.com>,
Peter Zijlstra <peterz@infradead.org>,
Mark Rutland <mark.rutland@arm.com>,
Juergen Christ <jchrist@linux.ibm.com>,
Ilya Leoshkevich <iii@linux.ibm.com>
Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org
Subject: [PATCH 11/12] s390: Add CC_HAS_ASM_M_FORMAT_FLAG config option
Date: Thu, 17 Sep 2026 21:22:36 +0200 [thread overview]
Message-ID: <20260917192237.638324-12-hca@linux.ibm.com> (raw)
In-Reply-To: <20260917192237.638324-1-hca@linux.ibm.com>
Add CONFIG_CC_HAS_ASM_M_FORMAT_FLAG as an indicator if the compiler
supports the 'M' operand modifier in inline assemblies. The 'M' modifier
allows to access the odd register of a TImode operand. Clang support for
this modifier was added recently to llvm-project [1].
The config option can be used to write conditional code depending on
compiler features.
[1] 28c23411e15f ("[SystemZ] Support the 'M' code for the odd register in inline-asm (#215481)")
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
---
arch/s390/Kconfig | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 4b51bc6e8948..f1fbbf6eb50a 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -66,6 +66,12 @@ config CC_HAS_ASM_AOR_FORMAT_FLAGS
Clang versions before 19.1.0 do not support A,
O, and R inline assembly format flags.
+config CC_HAS_ASM_M_FORMAT_FLAG
+ def_bool !(CC_IS_CLANG && CLANG_VERSION < 240100)
+ help
+ Clang versions before 24.1.0 do not support the
+ M inline assembly format flags.
+
config CC_HAS_ASM_IMMEDIATE_STRINGS
def_bool !(CC_IS_GCC && GCC_VERSION < 90000)
help
--
2.53.0
next prev parent reply other threads:[~2026-09-17 19:22 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-17 19:22 [PATCH 00/12] s390: More this_cpu_*() changes Heiko Carstens
2026-09-17 19:22 ` [PATCH 01/12] s390/percpu: Fix comment typo Heiko Carstens
2026-09-17 19:24 ` sashiko-bot
2026-09-17 19:22 ` [PATCH 02/12] s390/percpu: Add sanity check to GEN_MVIY macro Heiko Carstens
2026-09-17 19:26 ` sashiko-bot
2026-09-17 19:22 ` [PATCH 03/12] s390/lowcore: Remove _AC() from LOWCORE_ALT_ADDRESS Heiko Carstens
2026-09-17 19:29 ` sashiko-bot
2026-09-17 19:22 ` [PATCH 04/12] s390/percpu: Let MVIY_PERCPU() calculate alternative displacement Heiko Carstens
2026-09-17 19:29 ` sashiko-bot
2026-09-17 19:22 ` [PATCH 05/12] s390/percpu/lowcore: Add and use LC_PERCPU lowcore offset defines Heiko Carstens
2026-09-17 19:27 ` sashiko-bot
2026-09-17 19:22 ` [PATCH 06/12] s390/percpu: Rename inline assembly symbolic names Heiko Carstens
2026-09-17 19:25 ` sashiko-bot
2026-09-17 19:22 ` [PATCH 07/12] s390/percpu: Use __PCPU_BEGIN() and __PCPU_END() for inline assemblies Heiko Carstens
2026-09-17 19:26 ` sashiko-bot
2026-09-17 19:22 ` [PATCH 08/12] s390/percpu: Use percpu code section for this_cpu_cmpxchg128() Heiko Carstens
2026-09-17 19:29 ` sashiko-bot
2026-09-17 19:22 ` [PATCH 09/12] s390/percpu: Use percpu code section for this_cpu_xchg() Heiko Carstens
2026-09-17 19:30 ` sashiko-bot
2026-09-17 19:22 ` [PATCH 10/12] s390/percpu: Use percpu code section for this_cpu_cmpxchg() Heiko Carstens
2026-09-17 19:31 ` sashiko-bot
2026-09-17 19:22 ` Heiko Carstens [this message]
2026-09-17 19:32 ` [PATCH 11/12] s390: Add CC_HAS_ASM_M_FORMAT_FLAG config option sashiko-bot
2026-09-17 19:22 ` [PATCH 12/12] s390/percpu: Rework to simplify percpu_entry() and percpu_exit() Heiko Carstens
2026-09-17 19:42 ` sashiko-bot
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