linux-kernel - Re: [PATCH] riscv: declare overflow

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Date:   Thu, 23 Nov 2023 13:51:47 +0000
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Ben Dooks <ben.dooks@...ethink.co.uk>
CC:     <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <paul.walmsley@...ive.com>, <palmer@...belt.com>,
        <aou@...s.berkeley.edu>
Subject: Re: [PATCH] riscv: declare overflow_stack as exported from traps.c

On Thu, Nov 23, 2023 at 01:42:14PM +0000, Ben Dooks wrote:
> The percpu area overflow_stacks is exported from arch/riscv/kernel/traps.c
> for use in the entry code, but is not declared anywhere. Add the relevant
> declaration to arch/riscv/include/asm/stacktrace.h to silence the following
> sparse warning:
> 
> arch/riscv/kernel/traps.c:395:1: warning: symbol '__pcpu_scope_overflow_stack' was not declared. Should it be static?
> 
> We don't add the stackinfo_get_overflow() call as for some of the other
> architectures as this doesn't seem to be used yet, so just silence the
> warning.
> 
> Signed-off-by: Ben Dooks <ben.dooks@...ethink.co.uk>

Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
I suppose this should also be
Fixes: be97d0db5f44 ("riscv: VMAP_STACK overflow detection thread-safe")

Cheers,
Conor.

> ---
>  arch/riscv/include/asm/stacktrace.h | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/arch/riscv/include/asm/stacktrace.h b/arch/riscv/include/asm/stacktrace.h
> index f7e8ef2418b9..b1495a7e06ce 100644
> --- a/arch/riscv/include/asm/stacktrace.h
> +++ b/arch/riscv/include/asm/stacktrace.h
> @@ -21,4 +21,9 @@ static inline bool on_thread_stack(void)
>  	return !(((unsigned long)(current->stack) ^ current_stack_pointer) & ~(THREAD_SIZE - 1));
>  }
>  
> +
> +#ifdef CONFIG_VMAP_STACK
> +DECLARE_PER_CPU(unsigned long [OVERFLOW_STACK_SIZE/sizeof(long)], overflow_stack);
> +#endif /* CONFIG_VMAP_STACK */
> +
>  #endif /* _ASM_RISCV_STACKTRACE_H */
> -- 
> 2.37.2.352.g3c44437643
> 

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