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From:   =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= <bjorn@kernel.org>
To:     Guo Ren <guoren@kernel.org>
Cc:     arnd@arndb.de, palmer@rivosinc.com, tglx@linutronix.de,
        peterz@infradead.org, luto@kernel.org, conor.dooley@microchip.com,
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        linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-riscv@lists.infradead.org, Guo Ren <guoren@linux.alibaba.com>
Subject: Re: [PATCH -next V8 00/14] riscv: Add GENERIC_ENTRY support and
 related features
In-Reply-To: <CAJF2gTSgvKV3Oh6t2dpbJGnt3cDZU14Qk_CxKPMXmEmgvMg8-Q@mail.gmail.com>
References: <20221103075047.1634923-1-guoren@kernel.org>
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 <CAJF2gTSgvKV3Oh6t2dpbJGnt3cDZU14Qk_CxKPMXmEmgvMg8-Q@mail.gmail.com>
Date:   Tue, 06 Dec 2022 08:03:38 +0100
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Guo Ren <guoren@kernel.org> writes:

> On Mon, Dec 5, 2022 at 5:46 PM Bj=C3=B6rn T=C3=B6pel <bjorn@kernel.org> w=
rote:
>>
>> guoren@kernel.org writes:
>>
>> > From: Guo Ren <guoren@linux.alibaba.com>
>> >
>> > The patches convert riscv to use the generic entry infrastructure from
>> > kernel/entry/*. Additionally, add independent irq stacks (IRQ_STACKS)
>> > for percpu to prevent kernel stack overflows. Add generic_entry based
>> > STACKLEAK support. Some optimization for entry.S with new .macro and
>> > merge ret_from_kernel_thread into ret_from_fork.
>> >
>> > We have tested it with rv64, rv32, rv64 + 32rootfs, all are passed.
>> >
>> > You can directly try it with:
>> > [1] https://github.com/guoren83/linux/tree/generic_entry_v8
>>
>> Guo, this is a really nice work, and I'm looking forward having generic
>> entry support for RV. However, there are many patches in this series
>> that really shouldn't be part of the series.
>>
>> Patch 2, 3, 4, and 10 should defintely be pulled out.
> Okay.
>
>>
>> I'm not sure 7, 8, and 9 belong to series, as it's really a separate
>> feature.
> The separate irq/softirq stack patches dpend on generic_entry tightly,
> so I recommand put them together.

I'd say *depends* on the series, not required for generic entry. Again,
keeping the series orthogonal and small is a good thing.

>> For GENERIC_ENTRY support only patch 1, 5, 6, 12, 13, and 14, really
>> required. The others are unrelated.
> Thx for the reminder; I will re-organize them.

This is a really nice clean up, and the reason I'm pushing for removing
unrelated patches in the series, is because I want to see it land in the
RV tree sooner, rather than later. Send these as follow-ups to generic
entry, once it lands in the tree.


Thank you for the hard work!
Bj=C3=B6rn