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2024-02-19 890e1df1bec891d9203724541e81f8fbe5183388

 kernel/arch/s390/include/asm/percpu.h
..
..
@@ -31,7 +31,7 @@
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 	pcp_op_T__ *ptr__;						\
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 	preempt_disable_notrace();					\
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 	ptr__ = raw_cpu_ptr(&(pcp));					\
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-	prev__ = *ptr__;						\
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+	prev__ = READ_ONCE(*ptr__);					\
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 	do {								\
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 		old__ = prev__;						\
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 		new__ = old__ op (val);					\