enable docker ppp

hc

2023-12-09 95099d4622f8cb224d94e314c7a8e0df60b13f87

 kernel/arch/parisc/include/asm/barrier.h
..
..
@@ -2,11 +2,15 @@
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 #ifndef __ASM_BARRIER_H
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 #define __ASM_BARRIER_H
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+#include <asm/alternative.h>
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+
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 #ifndef __ASSEMBLY__
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 /* The synchronize caches instruction executes as a nop on systems in
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    which all memory references are performed in order. */
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-#define synchronize_caches() __asm__ __volatile__ ("sync" : : : "memory")
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+#define synchronize_caches() asm volatile("sync" \
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+	ALTERNATIVE(ALT_COND_NO_SMP, INSN_NOP) \
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+	: : : "memory")
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 #if defined(CONFIG_SMP)
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 #define mb()		do { synchronize_caches(); } while (0)