netdev - Re: [PATCH 2/7] mips: uasm: Add workaround for Loongson-2F nop CPU errata

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Date:   Tue, 5 Oct 2021 18:59:48 +0100
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     Johan Almbladh <johan.almbladh@...finetworks.com>, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, paulburton@...nel.org
Cc:     kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org,
        tsbogend@...ha.franken.de, chenhuacai@...nel.org,
        yangtiezhu@...ngson.cn, tony.ambardar@...il.com,
        bpf@...r.kernel.org, linux-mips@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH 2/7] mips: uasm: Add workaround for Loongson-2F nop CPU
 errata



在 2021/10/5 17:54, Johan Almbladh 写道:
> This patch implements a workaround for the Loongson-2F nop in generated,
> code, if the existing option CONFIG_CPU_NOP_WORKAROUND is set. Before,
> the binutils option -mfix-loongson2f-nop was enabled, but no workaround
> was done when emitting MIPS code. Now, the nop pseudo instruction is
> emitted as "or ax,ax,zero" instead of the default "sll zero,zero,0". This
> is consistent with the workaround implemented by binutils.
>
> Link: https://sourceware.org/legacy-ml/binutils/2009-11/msg00387.html
>
> Signed-off-by: Johan Almbladh <johan.almbladh@...finetworks.com>
Reviewed-by: Jiaxun Yang <jiaxun.yang@...goat.com>

Thanks!

- Jiaxun