[PATCH v2 9/9] s390/percpu: Remove one and two byte this_cpu operation implementation

Heiko Carstens
2026-03-19T12:05:19Z

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