linux-kernel - Re: [PATCH AUTOSEL 6.3 08/59] bpf, mips: Implement DADDI workarounds for JIT

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Message-ID: <ZGZaRfsA/FTvZcsX@sashalap>
Date:   Thu, 18 May 2023 13:03:01 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Jiaxun Yang <jiaxun.yang@...goat.com>
Cc:     linux-kernel@...r.kernel.org,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Philippe Mathieu-Daudé <philmd@...aro.org>,
        Johan Almbladh <johan.almbladh@...finetworks.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        "paulburton@...nel.org" <paulburton@...nel.org>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        bpf@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 6.3 08/59] bpf, mips: Implement DADDI workarounds
 for JIT

On Fri, May 05, 2023 at 01:04:14PM +0100, Jiaxun Yang wrote:
>
>
>> 2023年5月4日 20:40，Sasha Levin <sashal@...nel.org> 写道：
>>
>> From: Jiaxun Yang <jiaxun.yang@...goat.com>
>>
>> [ Upstream commit bbefef2f07080cd502a93cb1c529e1c8a6c4ac8e ]
>>
>> 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>
>> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
>> Reviewed-by: Philippe Mathieu-Daudé <philmd@...aro.org>
>> Acked-by: Johan Almbladh <johan.almbladh@...finetworks.com>
>> Link: https://lore.kernel.org/bpf/20230228113305.83751-2-jiaxun.yang@flygoat.com
>> Signed-off-by: Sasha Levin <sashal@...nel.org>
>
>Hi Sasha,
>
>I think this patch should count as a functional improvement instead of regression fix.
>
>Please drop it from stable queue.

Dropped, thanks!

-- 
Thanks,
Sasha