From: Linus Walleij <linusw@kernel.org>
To: Jinjie Ruan <ruanjinjie@huawei.com>
Cc: catalin.marinas@arm.com, will@kernel.org, oleg@redhat.com,
chenhuacai@kernel.org, kernel@xen0n.name, hca@linux.ibm.com,
gor@linux.ibm.com, agordeev@linux.ibm.com,
borntraeger@linux.ibm.com, svens@linux.ibm.com, tglx@kernel.org,
mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
hpa@zytor.com, arnd@arndb.de, peterz@infradead.org,
luto@kernel.org, shuah@kernel.org, kees@kernel.org,
wad@chromium.org, kevin.brodsky@arm.com, deller@gmx.de,
macro@orcam.me.uk, akpm@linux-foundation.org, ldv@strace.io,
anshuman.khandual@arm.com, ryan.roberts@arm.com,
mark.rutland@arm.com, thuth@redhat.com, song@kernel.org,
ada.coupriediaz@arm.com, broonie@kernel.org, pengcan@kylinos.cn,
liqiang01@kylinos.cn, ziyao@disroot.org,
guanwentao@uniontech.com, guoren@kernel.org,
schuster.simon@siemens-energy.com, jremus@linux.ibm.com,
david@kernel.org, mathieu.desnoyers@efficios.com,
edumazet@google.com, kmal@cock.li, dvyukov@google.com,
reddybalavignesh9979@gmail.com, x86@kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, loongarch@lists.linux.dev,
linux-s390@vger.kernel.org, linux-arch@vger.kernel.org,
linux-kselftest@vger.kernel.org
Subject: Re: [PATCH v13 RESEND 02/14] arm64/ptrace: Use syscall_get_nr() helper for syscall_trace_enter()
Date: Thu, 19 Mar 2026 14:50:15 +0100 [thread overview]
Message-ID: <CAD++jLmAxER7pR-eoJ4xs2EbGopsS4SWd+wo88xZbzkmPJp-Bw@mail.gmail.com> (raw)
In-Reply-To: <20260317082020.737779-3-ruanjinjie@huawei.com>
On Tue, Mar 17, 2026 at 9:20 AM Jinjie Ruan <ruanjinjie@huawei.com> wrote:
> Use syscall_get_nr() to get syscall number for syscall_trace_enter().
> This aligns arm64's internal tracing logic with the generic
> entry framework.
>
> [Changes]
> 1. Use syscall_get_nr() helper:
> - Replace direct regs->syscallno access with
> syscall_get_nr(current, regs).
> - This helper is functionally equivalent to direct access on arm64.
>
> 2. Re-read syscall number after tracepoint:
> - Re-fetch the syscall number after trace_sys_enter() as it may have
> been modified by BPF or ftrace probes, matching generic entry behavior.
>
> [Why this matters]
> - Aligns arm64 with the generic entry interface.
> - Makes future migration to generic entry framework.
> - Properly handles syscall number modifications by tracers.
> - Uses standard architecture-independent helpers.
>
> No functional changes intended.
>
> Cc: Will Deacon <will@kernel.org>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Reviewed-by: Kevin Brodsky <kevin.brodsky@arm.com>
> Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Yours,
Linus Walleij
next prev parent reply other threads:[~2026-03-19 13:50 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-17 8:20 [PATCH v13 RESEND 00/14] arm64: entry: Convert to Generic Entry Jinjie Ruan
2026-03-17 8:20 ` [PATCH v13 RESEND 01/14] arm64/ptrace: Refactor syscall_trace_enter/exit() to accept flags parameter Jinjie Ruan
2026-03-19 13:47 ` Linus Walleij
2026-03-17 8:20 ` [PATCH v13 RESEND 02/14] arm64/ptrace: Use syscall_get_nr() helper for syscall_trace_enter() Jinjie Ruan
2026-03-19 13:50 ` Linus Walleij [this message]
2026-03-17 8:20 ` [PATCH v13 RESEND 03/14] arm64/ptrace: Expand secure_computing() in place Jinjie Ruan
2026-03-19 13:58 ` Linus Walleij
2026-03-17 8:20 ` [PATCH v13 RESEND 04/14] arm64/ptrace: Use syscall_get_arguments() helper for audit Jinjie Ruan
2026-03-19 14:14 ` Linus Walleij
2026-03-17 8:20 ` [PATCH v13 RESEND 05/14] arm64: ptrace: Move rseq_syscall() before audit_syscall_exit() Jinjie Ruan
2026-03-19 14:16 ` Linus Walleij
2026-03-17 8:20 ` [PATCH v13 RESEND 06/14] arm64: syscall: Introduce syscall_exit_to_user_mode_work() Jinjie Ruan
2026-03-19 14:17 ` Linus Walleij
2026-03-17 8:20 ` [PATCH v13 RESEND 07/14] arm64/ptrace: Define and use _TIF_SYSCALL_EXIT_WORK Jinjie Ruan
2026-03-19 14:18 ` Linus Walleij
2026-03-17 8:20 ` [PATCH v13 RESEND 08/14] arm64/ptrace: Skip syscall exit reporting for PTRACE_SYSEMU_SINGLESTEP Jinjie Ruan
2026-03-19 14:20 ` Linus Walleij
2026-03-17 8:20 ` [PATCH v13 RESEND 09/14] arm64: entry: Convert to generic entry Jinjie Ruan
2026-03-17 10:58 ` Peter Zijlstra
2026-03-19 14:21 ` Linus Walleij
2026-03-17 8:20 ` [PATCH v13 RESEND 10/14] arm64: Inline el0_svc_common() Jinjie Ruan
2026-03-19 14:22 ` Linus Walleij
2026-03-17 8:20 ` [PATCH v13 RESEND 11/14] s390: Rename TIF_SINGLE_STEP to TIF_SINGLESTEP Jinjie Ruan
2026-03-19 14:23 ` Linus Walleij
2026-03-19 17:05 ` Kevin Brodsky
2026-03-17 8:20 ` [PATCH v13 RESEND 12/14] asm-generic: Move TIF_SINGLESTEP to generic TIF bits Jinjie Ruan
2026-03-19 14:24 ` Linus Walleij
2026-03-19 17:05 ` Kevin Brodsky
2026-03-17 8:20 ` [PATCH v13 RESEND 13/14] arm64: Use generic TIF bits for common thread flags Jinjie Ruan
2026-03-19 14:24 ` Linus Walleij
2026-03-19 17:07 ` Kevin Brodsky
2026-03-20 9:21 ` Jinjie Ruan
2026-03-17 8:20 ` [PATCH v13 RESEND 14/14] selftests: sud_test: Support aarch64 Jinjie Ruan
2026-03-19 14:26 ` Linus Walleij
2026-03-20 9:23 ` Jinjie Ruan
2026-03-17 10:57 ` [PATCH v13 RESEND 00/14] arm64: entry: Convert to Generic Entry Yeoreum Yun
2026-03-19 14:35 ` Linus Walleij
2026-03-20 9:28 ` Jinjie Ruan
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