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>,
Juergen Christ <jchrist@linux.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org
Subject: [PATCH v2 9/9] s390/percpu: Remove one and two byte this_cpu operation implementation
Date: Thu, 19 Mar 2026 13:05:03 +0100 [thread overview]
Message-ID: <20260319120503.4046659-10-hca@linux.ibm.com> (raw)
In-Reply-To: <20260319120503.4046659-1-hca@linux.ibm.com>
There are no one and two byte this_cpu operations within the kernel
(defconfig). However even if there would be the s390 implementation, which
uses a cmpxchg loop, generates a very large code sequence due to the lack
of native one and two byte cmpxchg instructions.
Remove the s390 implementation and use the generic implementation.
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
---
arch/s390/include/asm/percpu.h | 9 ---------
1 file changed, 9 deletions(-)
diff --git a/arch/s390/include/asm/percpu.h b/arch/s390/include/asm/percpu.h
index 44501a407e6d..b5b61471439b 100644
--- a/arch/s390/include/asm/percpu.h
+++ b/arch/s390/include/asm/percpu.h
@@ -51,15 +51,6 @@
new__; \
})
-#define this_cpu_add_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
-#define this_cpu_add_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
-#define this_cpu_add_return_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
-#define this_cpu_add_return_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, +)
-#define this_cpu_and_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
-#define this_cpu_and_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, &)
-#define this_cpu_or_1(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
-#define this_cpu_or_2(pcp, val) arch_this_cpu_to_op_simple(pcp, val, |)
-
/*
* Macros to be used for percpu code section based on atomic instructions.
*
--
2.51.0
next prev parent reply other threads:[~2026-03-19 12:05 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-19 12:04 [PATCH v2 0/9] s390: Improve this_cpu operations Heiko Carstens
2026-03-19 12:04 ` [PATCH v2 1/9] s390/percpu: Provide arch_raw_cpu_ptr() Heiko Carstens
2026-03-19 12:04 ` [PATCH v2 2/9] s390/alternatives: Add new ALT_TYPE_PERCPU type Heiko Carstens
2026-03-19 12:04 ` [PATCH v2 3/9] s390/percpu: Infrastructure for more efficient this_cpu operations Heiko Carstens
2026-03-19 12:04 ` [PATCH v2 4/9] s390/percpu: Use new percpu code section for arch_this_cpu_add() Heiko Carstens
2026-03-19 12:04 ` [PATCH v2 5/9] s390/percpu: Use new percpu code section for arch_this_cpu_add_return() Heiko Carstens
2026-03-19 12:05 ` [PATCH v2 6/9] s390/percpu: Use new percpu code section for arch_this_cpu_[and|or]() Heiko Carstens
2026-03-19 12:05 ` [PATCH v2 7/9] s390/percpu: Provide arch_this_cpu_read() implementation Heiko Carstens
2026-03-19 12:05 ` [PATCH v2 8/9] s390/percpu: Provide arch_this_cpu_write() implementation Heiko Carstens
2026-03-19 12:05 ` Heiko Carstens [this message]
2026-03-19 13:56 ` [PATCH v2 0/9] s390: Improve this_cpu operations Peter Zijlstra
2026-03-20 11:39 ` Heiko Carstens
2026-03-20 11:44 ` Peter Zijlstra
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