[PATCH -next V13 1/3] riscv: stack: Support HAVE_IRQ_EXIT_ON_IRQ_STACK

[Jason A. Donenfeld]

Hi Conor,

On Fri, Aug 4, 2023 at 11:41 PM Conor Dooley <conor at kernel.org> wrote:
>
> On Fri, Aug 04, 2023 at 11:28:17PM +0200, Jason A. Donenfeld wrote:
> > On Fri, Aug 4, 2023 at 11:28 PM Jason A. Donenfeld <Jason at zx2c4.com> wrote:
> > >
> > > Hi Guo,
> > >
> > > On Tue, Jun 13, 2023 at 09:30:16PM -0400, guoren at kernel.org wrote:
> > > > From: Guo Ren <guoren at linux.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 at kernel.org>
> > > > Signed-off-by: Guo Ren <guoren at linux.alibaba.com>
> > > > Signed-off-by: Guo Ren <guoren at kernel.org>
> > > > Cc: Clément Léger <cleger at rivosinc.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?
>
> Given your config, I suspect you're hitting the issue that is resolved
> by Guo Ren's series:
> https://lore.kernel.org/linux-riscv/20230716001506.3506041-1-guoren@kernel.org/
>
> Hopefully that's it,
> Conor.

Thanks! That did the trick. I suppose this will be in the next 6.5 rc.

Jason