linux-kernel - Re: [PATCH -next V13 1/3] riscv: stack: Support HAVE_IRQ_EXIT_ON_IRQ

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Date:   Fri, 4 Aug 2023 23:26:50 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     guoren@...nel.org
Cc:     arnd@...db.de, palmer@...osinc.com, conor.dooley@...rochip.com,
        heiko@...ech.de, jszhang@...nel.org, bjorn@...nel.org,
        cleger@...osinc.com, 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 V13 1/3] riscv: stack: Support
 HAVE_IRQ_EXIT_ON_IRQ_STACK

Hi Guo,

On Tue, Jun 13, 2023 at 09:30:16PM -0400, guoren@...nel.org wrote:
> From: Guo Ren <guoren@...ux.alibaba.com>
> 
> Add independent irq stacks for percpu to prevent kernel stack overflows.
> It is also compatible with VMAP_STACK by arch_alloc_vmap_stack.
> 
> Tested-by: Jisheng Zhang <jszhang@...nel.org>
> Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
> Signed-off-by: Guo Ren <guoren@...nel.org>
> Cc: Clément Léger <cleger@...osinc.com>

This patch broke the WireGuard test suite. I've attached the .config
file that it uses. I'm able to fix it by setting CONFIG_EXPERT=y and
CONFIG_IRQ_STACKS=n to essentially reverse the effect of this patch. But
I'd rather not do that.

Any idea what's up?

Thanks,
Jason

View attachment ".config" of type "text/plain" (45739 bytes)