linux-kernel - Re: [PATCH v4 3/9] bpf/btf: Add a function to search a member of a struct/union

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Message-ID: <20230801204407.7b284b00@rorschach.local.home>
Date:   Tue, 1 Aug 2023 20:44:07 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        linux-trace-kernel@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        bpf <bpf@...r.kernel.org>, Sven Schnelle <svens@...ux.ibm.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alan Maguire <alan.maguire@...cle.com>,
        Mark Rutland <mark.rutland@....com>,
        Florent Revest <revest@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v4 3/9] bpf/btf: Add a function to search a member of a
 struct/union

On Tue, 1 Aug 2023 20:40:54 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> Maybe we can add a ftrace_partial_regs(fregs) that returns a
> partially filled pt_regs, and the caller that uses this obviously knows
> its partial (as it's in the name). But this doesn't quite help out arm64
> because unlike x86, struct ftrace_regs does not contain an address
> compatibility with pt_regs fields. It would need to do a copy.
> 
>  ftrace_partial_regs(fregs, &regs) ?

Well, both would be pointers so you wouldn't need the "&", but it was
to stress that it would be copying one to the other.

  void ftrace_partial_regs(const struct ftrace_regs *fregs, struct pt_regs regs);

-- Steve