linux-kernel - Re: [PATCH v2] riscv: add tracepoints for page fault

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Message-ID: <ZpfbVzwT5flLqatZ@casper.infradead.org>
Date: Wed, 17 Jul 2024 15:55:19 +0100
From: Matthew Wilcox <willy@...radead.org>
To: Zhu Hengbo <zhuhengbo@...as.ac.cn>
Cc: Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	Kefeng Wang <wangkefeng.wang@...wei.com>,
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] riscv: add tracepoints for page fault

On Wed, Jul 17, 2024 at 08:27:19AM +0000, Zhu Hengbo wrote:
> +	TP_STRUCT__entry(
> +		__field(unsigned long, address)
> +		__field(unsigned long, epc)
> +		__field(unsigned long, cause)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->address	= regs->badaddr;
> +		__entry->epc		= regs->epc;
> +		__entry->cause		= regs->cause;
> +	),
> +
> +	TP_printk("user page fault, address=%ps epc=%ps cause=0x%lx",
> +			(void *)__entry->address, (void *)__entry->epc,
> +			__entry->cause)

What is "epc"?  You've made this gratuitously different from x86.
Never do that.  Always copy what somebody else has done unless you have
a good reason to be different.