disable cpu isolcpus

hc

2023-12-09 958e46acc8e900e8569dd467c1af9b8d2d019394

 kernel/include/asm-generic/dma-mapping.h
..
..
@@ -4,16 +4,7 @@
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 static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
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 {
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-	/*
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-	 * Use the non-coherent ops if available.  If an architecture wants a
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-	 * more fine-grained selection of operations it will have to implement
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-	 * get_arch_dma_ops itself or use the per-device dma_ops.
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-	 */
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-#ifdef CONFIG_DMA_NONCOHERENT_OPS
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-	return &dma_noncoherent_ops;
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-#else
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-	return &dma_direct_ops;
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-#endif
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+	return NULL;
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 }
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 #endif /* _ASM_GENERIC_DMA_MAPPING_H */