linux-kernel - Re: [PATCH v2 2/2] ftrace: Consolidate ftrace_regs accessor functions for archs using pt

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Message-ID: <20241009093714.8007-D-hca@linux.ibm.com>
Date: Wed, 9 Oct 2024 11:37:14 +0200
From: Heiko Carstens <hca@...ux.ibm.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, loongarch@...ts.linux.dev,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>, Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Naveen N Rao <naveen@...nel.org>,
        Madhavan Srinivasan <maddy@...ux.ibm.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH v2 2/2] ftrace: Consolidate ftrace_regs accessor
 functions for archs using pt_regs

On Tue, Oct 08, 2024 at 07:05:29PM -0400, Steven Rostedt wrote:
> From: Steven Rostedt <rostedt@...dmis.org>
> 
> Most architectures use pt_regs within ftrace_regs making a lot of the
> accessor functions just calls to the pt_regs internally. Instead of
> duplication this effort, use a HAVE_ARCH_FTRACE_REGS for architectures
> that have their own ftrace_regs that is not based on pt_regs and will
> define all the accessor functions, and for the architectures that just use
> pt_regs, it will leave it undefined, and the default accessor functions
> will be used.
> 
> Note, this will also make it easier to add new accessor functions to
> ftrace_regs as it will mean having to touch less architectures.
> 
> Suggested-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
...
>  arch/s390/include/asm/ftrace.h      | 26 +--------------------

Acked-by: Heiko Carstens <hca@...ux.ibm.com> # s390