From: Jinjie Ruan <ruanjinjie@huawei.com>
To: <catalin.marinas@arm.com>, <will@kernel.org>,
<mark.rutland@arm.com>, <oleg@redhat.com>, <kees@kernel.org>,
<luto@amacapital.net>, <wad@chromium.org>, <peterz@infradead.org>,
<ada.coupriediaz@arm.com>, <linusw@kernel.org>,
<kevin.brodsky@arm.com>, <yeoreum.yun@arm.com>,
<thuth@redhat.com>, <james.morse@arm.com>,
<vladimir.murzin@arm.com>, <broonie@kernel.org>,
<pengcan@kylinos.cn>, <liqiang01@kylinos.cn>,
<ryan.roberts@arm.com>, <linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>
Cc: <ruanjinjie@huawei.com>
Subject: [PATCH v18 08/14] arm64: ptrace: Extract arm64_syscall_exit_to_user_mode_work() helper
Date: Wed, 2 Sep 2026 17:55:31 +0800 [thread overview]
Message-ID: <20260902095537.602517-9-ruanjinjie@huawei.com> (raw)
In-Reply-To: <20260902095537.602517-1-ruanjinjie@huawei.com>
Introduce a helper arm64_syscall_exit_to_user_mode_work() that
encapsulates the re-reading of thread flags and the call to
syscall_trace_exit(). Use it in el0_svc_common() to replace
the open-coded instances, removing the duplicated flags read
and making the control flow simpler.
This aligns the arm64 exit path with the pattern expected by the
generic entry infrastructure, which uses a similar
syscall_exit_to_user_mode_work() callback.
No functional changes intended; this is a preparation step for converting
arm64 to the generic entry infrastructure.
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Ada Couprie Diaz <ada.coupriediaz@arm.com>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
---
arch/arm64/include/asm/syscall.h | 7 +++++++
arch/arm64/kernel/syscall.c | 9 +++------
2 files changed, 10 insertions(+), 6 deletions(-)
diff --git a/arch/arm64/include/asm/syscall.h b/arch/arm64/include/asm/syscall.h
index 696739f5a250..3e4672ab4a4f 100644
--- a/arch/arm64/include/asm/syscall.h
+++ b/arch/arm64/include/asm/syscall.h
@@ -123,4 +123,11 @@ static inline int syscall_get_arch(struct task_struct *task)
int arm64_syscall_trace_enter(struct pt_regs *regs, unsigned long flags);
void syscall_trace_exit(struct pt_regs *regs, unsigned long flags);
+static __always_inline void arm64_syscall_exit_to_user_mode_work(struct pt_regs *regs)
+{
+ unsigned long flags = read_thread_flags();
+
+ syscall_trace_exit(regs, flags);
+}
+
#endif /* __ASM_SYSCALL_H */
diff --git a/arch/arm64/kernel/syscall.c b/arch/arm64/kernel/syscall.c
index e778aac6fab9..0061fc63e7ba 100644
--- a/arch/arm64/kernel/syscall.c
+++ b/arch/arm64/kernel/syscall.c
@@ -127,16 +127,13 @@ static void el0_svc_common(struct pt_regs *regs, int scno, int sc_nr,
*/
if (!has_syscall_work(flags) && !IS_ENABLED(CONFIG_DEBUG_RSEQ)) {
flags = read_thread_flags();
- if (has_syscall_work(flags) || flags & _TIF_SINGLESTEP) {
- flags = read_thread_flags();
- syscall_trace_exit(regs, flags);
- }
+ if (has_syscall_work(flags) || flags & _TIF_SINGLESTEP)
+ arm64_syscall_exit_to_user_mode_work(regs);
return;
}
trace_exit:
- flags = read_thread_flags();
- syscall_trace_exit(regs, flags);
+ arm64_syscall_exit_to_user_mode_work(regs);
}
void do_el0_svc(struct pt_regs *regs)
--
2.34.1
next prev parent reply other threads:[~2026-09-02 9:55 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-02 9:55 [PATCH v18 00/14] arm64: entry: Convert to Generic Entry Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 01/14] arm64: ptrace: Fix redundant syscall exit stop for PTRACE_SYSEMU_SINGLESTEP Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 02/14] arm64: ptrace: Rework audit_syscall_entry() Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 03/14] arm64: ptrace: Open-code seccomp check in syscall_trace_enter() Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 04/14] arm64: ptrace: Rename and clean up syscall_trace_enter() Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 05/14] arm64: ptrace: Protect rseq_syscall() from tracer PC modifications Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 06/14] arm64: syscall: Rework the syscall exit path in el0_svc_common() Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 07/14] arm64: ptrace: Pass thread flags to trace enter/exit Jinjie Ruan
2026-09-02 9:55 ` Jinjie Ruan [this message]
2026-09-02 9:55 ` [PATCH v18 09/14] arm64: ptrace: Align syscall exit work semantics with generic entry Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 10/14] arm64: syscall: Use exit-specific flags check in el0_svc_common() Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 11/14] arm64: syscall: Simplify el0_svc_common() syscall exit path Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 12/14] arm64: ptrace: Make return type of arm64_syscall_trace_enter() bool Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 13/14] arm64: entry: Convert to generic entry Jinjie Ruan
2026-09-02 9:55 ` [PATCH v18 14/14] arm64: Inline el0_svc_common() Jinjie Ruan
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