linux-kernel - Re: [PATCH v3 bpf-next 7/8] bpf: add support for %pT format specifier for bpf_trace

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Date:   Tue, 23 Jun 2020 16:04:34 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Alan Maguire <alan.maguire@...cle.com>
Cc:     ast@...nel.org, daniel@...earbox.net, yhs@...com, andriin@...com,
        arnaldo.melo@...il.com, kafai@...com, songliubraving@...com,
        john.fastabend@...il.com, kpsingh@...omium.org,
        linux@...musvillemoes.dk, joe@...ches.com, pmladek@...e.com,
        rostedt@...dmis.org, sergey.senozhatsky@...il.com, corbet@....net,
        bpf@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v3 bpf-next 7/8] bpf: add support for %pT format
 specifier for bpf_trace_printk() helper

On Tue, Jun 23, 2020 at 01:07:10PM +0100, Alan Maguire wrote:
> Allow %pT[cNx0] format specifier for BTF-based display of data associated
> with pointer.  The unsafe data modifier 'u' - where the source data
> is traversed without copying it to a safe buffer via probe_kernel_read() -
> is not supported.

I think I already saw this data structure definition...

> +/*
> + * struct __btf_ptr is used for %pT (typed pointer) display; the
> + * additional type string/BTF id are used to render the pointer
> + * data as the appropriate type.
> + */
> +struct __btf_ptr {
> +	void *ptr;
> +	const char *type;
> +	__u32 id;
> +};

So, this is 2nd...


> +/*
> + * struct __btf_ptr is used for %pT (typed pointer) display; the
> + * additional type string/BTF id are used to render the pointer
> + * data as the appropriate type.
> + */
> +struct __btf_ptr {
> +	void *ptr;
> +	const char *type;
> +	__u32 id;
> +};

,..and this is 3rd copy. Why?

-- 
With Best Regards,
Andy Shevchenko