linux-kernel - Re: [PATCH v8 10/12] entry: Add arch_ptrace_report_syscall

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Message-ID: <1fecc357-2d7d-4016-b70f-5789ff4a8262@arm.com>
Date: Thu, 27 Nov 2025 14:30:51 +0100
From: Kevin Brodsky <kevin.brodsky@....com>
To: Jinjie Ruan <ruanjinjie@...wei.com>, catalin.marinas@....com,
 will@...nel.org, oleg@...hat.com, tglx@...utronix.de, peterz@...radead.org,
 luto@...nel.org, shuah@...nel.org, kees@...nel.org, wad@...omium.org,
 charlie@...osinc.com, akpm@...ux-foundation.org, ldv@...ace.io,
 macro@...am.me.uk, deller@....de, mark.rutland@....com, efault@....de,
 song@...nel.org, mbenes@...e.cz, ryan.roberts@....com,
 ada.coupriediaz@....com, anshuman.khandual@....com, broonie@...nel.org,
 pengcan@...inos.cn, dvyukov@...gle.com, kmal@...k.li,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v8 10/12] entry: Add
 arch_ptrace_report_syscall_entry/exit()

On 26/11/2025 08:14, Jinjie Ruan wrote:
> Differ from generic entry, due to historical reasons, ARM64 need to
> save/restore during syscall entry/exit because ARM64 use a scratch
> register (ip(r12) on AArch32, x7 on AArch64) to denote syscall entry/exit.
>
> In preparation for moving arm64 over to the generic entry code,
> add arch_ptrace_report_syscall_entry/exit() as the default
> ptrace_report_syscall_entry/exit() implementation. This allows
> arm64 to implement the architecture specific version.
>
> This allows arm64 to implement the architecture specific version.
>
> Suggested-by: Mark Rutland <mark.rutland@....com>
> Suggested-by: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>

Reviewed-by: Kevin Brodsky <kevin.brodsky@....com>