linux-kernel - Re: [PATCH v2 1/2] MIPS: ebpf jit: Implement DADDI workarounds

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Date:   Tue, 28 Feb 2023 13:02:22 +0100
From:   Philippe Mathieu-Daudé <philmd@...aro.org>
To:     Jiaxun Yang <jiaxun.yang@...goat.com>, linux-mips@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, tsbogend@...ha.franken.de,
        johan.almbladh@...finetworks.com, paulburton@...nel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH v2 1/2] MIPS: ebpf jit: Implement DADDI workarounds

On 28/2/23 12:33, Jiaxun Yang wrote:
> For DADDI errata we just workaround by disable immediate operation
> for BPF_ADD / BPF_SUB to avoid generation of DADDIU.
> 
> All other use cases in JIT won't cause overflow thus they are all safe.
> 
> Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
> ---
> v2: Drop 64BIT ifdef
> ---
>   arch/mips/Kconfig            | 1 -
>   arch/mips/net/bpf_jit_comp.c | 4 ++++
>   2 files changed, 4 insertions(+), 1 deletion(-)

Reviewed-by: Philippe Mathieu-Daudé <philmd@...aro.org>