linux-kernel - Re: [PATCH 00/14] scripts/sorttable: ftrace: Remove place holders for weak functions in available_filter

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Message-ID: <20250102144718.51689c71@gandalf.local.home>
Date: Thu, 2 Jan 2025 14:47:18 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 linux-kbuild@...r.kernel.org, bpf <bpf@...r.kernel.org>, Masami Hiramatsu
 <mhiramat@...nel.org>, Mark Rutland <mark.rutland@....com>, Mathieu
 Desnoyers <mathieu.desnoyers@...icios.com>, Andrew Morton
 <akpm@...ux-foundation.org>, Peter Zijlstra <peterz@...radead.org>,
 Masahiro Yamada <masahiroy@...nel.org>, Nathan Chancellor
 <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, Zheng Yejian
 <zhengyejian1@...wei.com>, Martin Kelly <martin.kelly@...wdstrike.com>,
 Christophe Leroy <christophe.leroy@...roup.eu>, Josh Poimboeuf
 <jpoimboe@...hat.com>
Subject: Re: [PATCH 00/14] scripts/sorttable: ftrace: Remove place holders
 for weak functions in available_filter_functions

On Thu, 2 Jan 2025 14:45:53 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> > Why even do that? Why not just make the mcount_loc table be proper in
> > the first place.  
> 
> I was a bit nervous about changing the stop_mcount_loc value. I thought of
> doing that first, but then I noticed that the value is found by looking at
> the System.map file and not from the object itself. Changing it in the
> object will require some more elf parsing. Just zeroing out didn't require
> that.

I could still zero it out, but then change the start_mcount_loc to the
first valid function after the sort. As all the zeros will be at the start.

-- Steve