linux-kernel - Re: [PATCH] ARM: ftrace: Implement HAVE_FUNCTION_GRAPH

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Message-ID: <CACRpkdbwUU5TmeVhcSAZ_ZaFa5nGVtyFBjNXBwNMC5y38heELA@mail.gmail.com>
Date: Wed, 20 Aug 2025 09:26:34 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: Richard Weinberger <richard@....at>
Cc: linux@...linux.org.uk, rostedt@...dmis.org, mhiramat@...nel.org, 
	mark.rutland@....com, ardb@...nel.org, ebiggers@...nel.org, nathan@...nel.org, 
	dave@...ilevsky.ca, ruanjinjie@...wei.com, liuyuntao12@...wei.com, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-trace-kernel@...r.kernel.org, Donglin Peng <pengdonglin@...gfor.com.cn>
Subject: Re: [PATCH] ARM: ftrace: Implement HAVE_FUNCTION_GRAPH_FREGS

Unsolicited thread intervention:

Richard if you use ftrace on ARM a lot, have you looked into
patchable function entry as described by Mark Rutland for
ARM64 in this talk?
https://www.youtube.com/watch?v=p9cqUTF4I0w
(Described at 19:12 into the talk.)

I think it would be neat if we could do this on ARM32 as well
but I do not know how hard it would be.

Yours,
Linus Walleij