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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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4103cfe9dc
ARCH_DMA_MINALIGN is 1 by default, but some LoongArch-specific devices (such as APBDMA) require 16 bytes alignment. When the data buffer length is too small, the hardware may make an error writing cacheline. Thus, it is dangerous to allocate a small memory buffer for DMA. It's always safe to define ARCH_DMA_MINALIGN as L1_CACHE_BYTES but unnecessary (kmalloc() need small memory objects). Therefore, just increase it to 16. Cc: stable@vger.kernel.org Tested-by: Binbin Zhou <zhoubinbin@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
16 lines
362 B
C
16 lines
362 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#ifndef _ASM_CACHE_H
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#define _ASM_CACHE_H
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#define L1_CACHE_SHIFT CONFIG_L1_CACHE_SHIFT
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#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
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#define ARCH_DMA_MINALIGN (16)
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#define __read_mostly __section(".data..read_mostly")
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#endif /* _ASM_CACHE_H */
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