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McKenney" , x86@kernel.org, Sean Christopherson , Wei Liu Subject: [patch V6 11/31] entry: Remove syscall_enter_from_user_mode_prepare() References: <20251027084220.785525188@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Date: Mon, 27 Oct 2025 09:44:38 +0100 (CET) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Open code the only user in the x86 syscall code and reduce the zoo of functions. Signed-off-by: Thomas Gleixner Reviewed-by: Mathieu Desnoyers --- arch/x86/entry/syscall_32.c | 3 ++- include/linux/entry-common.h | 26 +++++--------------------- kernel/entry/syscall-common.c | 8 -------- 3 files changed, 7 insertions(+), 30 deletions(-) --- a/arch/x86/entry/syscall_32.c +++ b/arch/x86/entry/syscall_32.c @@ -274,9 +274,10 @@ static noinstr bool __do_fast_syscall_32 * fetch EBP before invoking any of the syscall entry work * functions. */ - syscall_enter_from_user_mode_prepare(regs); + enter_from_user_mode(regs); =20 instrumentation_begin(); + local_irq_enable(); /* Fetch EBP from where the vDSO stashed it. */ if (IS_ENABLED(CONFIG_X86_64)) { /* --- a/include/linux/entry-common.h +++ b/include/linux/entry-common.h @@ -45,23 +45,6 @@ SYSCALL_WORK_SYSCALL_EXIT_TRAP | \ ARCH_SYSCALL_WORK_EXIT) =20 -/** - * syscall_enter_from_user_mode_prepare - Establish state and enable inter= rupts - * @regs: Pointer to currents pt_regs - * - * Invoked from architecture specific syscall entry code with interrupts - * disabled. The calling code has to be non-instrumentable. When the - * function returns all state is correct, interrupts are enabled and the - * subsequent functions can be instrumented. - * - * This handles lockdep, RCU (context tracking) and tracing state, i.e. - * the functionality provided by enter_from_user_mode(). - * - * This is invoked when there is extra architecture specific functionality - * to be done between establishing state and handling user mode entry work. - */ -void syscall_enter_from_user_mode_prepare(struct pt_regs *regs); - long syscall_trace_enter(struct pt_regs *regs, long syscall, unsigned long= work); =20 /** @@ -71,8 +54,8 @@ long syscall_trace_enter(struct pt_regs * @syscall: The syscall number * * Invoked from architecture specific syscall entry code with interrupts - * enabled after invoking syscall_enter_from_user_mode_prepare() and extra - * architecture specific work. + * enabled after invoking enter_from_user_mode(), enabling interrupts and + * extra architecture specific work. * * Returns: The original or a modified syscall number * @@ -108,8 +91,9 @@ static __always_inline long syscall_ente * function returns all state is correct, interrupts are enabled and the * subsequent functions can be instrumented. * - * This is combination of syscall_enter_from_user_mode_prepare() and - * syscall_enter_from_user_mode_work(). + * This is the combination of enter_from_user_mode() and + * syscall_enter_from_user_mode_work() to be used when there is no + * architecture specific work to be done between the two. * * Returns: The original or a modified syscall number. See * syscall_enter_from_user_mode_work() for further explanation. --- a/kernel/entry/syscall-common.c +++ b/kernel/entry/syscall-common.c @@ -63,14 +63,6 @@ long syscall_trace_enter(struct pt_regs return ret ? : syscall; } =20 -noinstr void syscall_enter_from_user_mode_prepare(struct pt_regs *regs) -{ - enter_from_user_mode(regs); - instrumentation_begin(); - local_irq_enable(); - instrumentation_end(); -} - /* * If SYSCALL_EMU is set, then the only reason to report is when * SINGLESTEP is set (i.e. PTRACE_SYSEMU_SINGLESTEP). This syscall