linux-kernel - Re: [PATCH -next V8 00/14] riscv: Add GENERIC

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Message-ID: <877cz69o8f.fsf@all.your.base.are.belong.to.us>
Date:   Mon, 05 Dec 2022 10:46:56 +0100
From:   Björn Töpel <bjorn@...nel.org>
To:     guoren@...nel.org, arnd@...db.de, guoren@...nel.org,
        palmer@...osinc.com, tglx@...utronix.de, peterz@...radead.org,
        luto@...nel.org, conor.dooley@...rochip.com, heiko@...ech.de,
        jszhang@...nel.org, lazyparser@...il.com, falcon@...ylab.org,
        chenhuacai@...nel.org, apatel@...tanamicro.com,
        atishp@...shpatra.org, palmer@...belt.com,
        paul.walmsley@...ive.com, mark.rutland@....com,
        zouyipeng@...wei.com, bigeasy@...utronix.de,
        David.Laight@...lab.com, chenzhongjin@...wei.com,
        greentime.hu@...ive.com, andy.chiu@...ive.com
Cc:     linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org, Guo Ren <guoren@...ux.alibaba.com>
Subject: Re: [PATCH -next V8 00/14] riscv: Add GENERIC_ENTRY support and
 related features

guoren@...nel.org writes:

> From: Guo Ren <guoren@...ux.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.

I'm not sure 7, 8, and 9 belong to series, as it's really a separate
feature.

Dito for patch 11, it just makes the series harder to review.

For GENERIC_ENTRY support only patch 1, 5, 6, 12, 13, and 14, really
required. The others are unrelated.


Thanks,
Björn