s390/percpu: Provide arch_this_cpu_read() implementation

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Provide an s390 specific implementation of arch_this_cpu_read() instead
of the generic variant. The generic variant uses preempt_disable() /
preempt_enable() pair and READ_ONCE().

Get rid of the preempt_disable() / preempt_enable() pairs by providing an
own variant which makes use of the new percpu code section infrastructure.

With this the text size of the kernel image is reduced by ~1k
(defconfig). Also 87 generated preempt_schedule_notrace() function
calls within the kernel image (modules not counted) are removed.

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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Heiko Carstens 2026-05-26 07:57:01 +02:00 • committed by Alexander Gordeev

parent ee8cefbfb0

commit 9858c19a66

1 changed files with 31 additions and 0 deletions

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arch/s390/include/asm/percpu.h

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