linux-kernel - Re: [PATCH] powerpc/ftrace: fix syscall tracing on PPC64_ELF_ABI

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Date:   Wed, 7 Dec 2022 16:59:24 +0100
From:   Michal Suchánek <msuchanek@...e.de>
To:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Michael Jeanson <mjeanson@...icios.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Steven Rostedt <rostedt@...dmis.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Nicholas Piggin <npiggin@...il.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] powerpc/ftrace: fix syscall tracing on PPC64_ELF_ABI_V1

Hello,

On Wed, Dec 07, 2022 at 10:18:13AM -0500, Mathieu Desnoyers wrote:
> On 2022-12-06 21:09, Michael Ellerman wrote:
> > Mathieu Desnoyers <mathieu.desnoyers@...icios.com> writes:
> > > On 2022-12-05 17:50, Michael Ellerman wrote:

> > 
> > Relatedly we have a patch in next to optionally use ABIv2 for 64-bit big
> > endian builds.
> 
> Interesting. Does it require a matching user-space ? (built with PPC64 ABIv2

No, the kernel and userspace ABI is separate.

> ?) Does it handle legacy PPC32 executables ?

Theoretically it should. No idea if anybody has tested it.

Thanks

Michal