linux-kernel - Re: [PATCH] riscv: entry: Fixup do_trap

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Date:   Mon, 3 Jul 2023 11:29:41 +0100
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     guoren@...nel.org
Cc:     arnd@...db.de, 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, mark.rutland@....com, bjorn@...nel.org,
        palmer@...belt.com, bjorn@...osinc.com, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        stable@...r.kernel.org, Guo Ren <guoren@...ux.alibaba.com>
Subject: Re: [PATCH] riscv: entry: Fixup do_trap_break from kernel side

On Sat, Jul 01, 2023 at 10:57:07PM -0400, guoren@...nel.org wrote:
> From: Guo Ren <guoren@...ux.alibaba.com>
>
> The irqentry_nmi_enter/exit would force the current context into in_interrupt.
> That would trigger the kernel to dead panic, but the kdb still needs "ebreak" to
> debug the kernel.
>
> Move irqentry_nmi_enter/exit to exception_enter/exit could correct handle_break
> of the kernel side.

<snip>

> Fixes: f0bddf50586d ("riscv: entry: Convert to generic entry")
> Reported-by: Daniel Thompson <daniel.thompson@...aro.org>
> Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
> Signed-off-by: Guo Ren <guoren@...nel.org>
> Cc: stable@...r.kernel.org

I pushed this though the kgdb test suite that originally found the
problem (although it didn't occur to me when I reported it that
the problem was nothing to do with kgdb ;-) ). So FWIW:

Tested-by: Daniel Thompson <daniel.thompson@...aro.org>


Daniel.