From: oleg@redhat.com (Oleg Nesterov)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v4 3/5] x86: Split syscall_trace_enter into two phases
Date: Tue, 29 Jul 2014 21:25:55 +0200 [thread overview]
Message-ID: <20140729192555.GB6308@redhat.com> (raw)
In-Reply-To: <714cf438762d342673b3b131d5c90bc69ca921a9.1406604806.git.luto@amacapital.net>
On 07/28, Andy Lutomirski wrote:
>
> +long syscall_trace_enter_phase2(struct pt_regs *regs, u32 arch,
> + unsigned long phase1_result)
> +{
> + long ret = 0;
> + u32 work = ACCESS_ONCE(current_thread_info()->flags) &
> + _TIF_WORK_SYSCALL_ENTRY;
> +
> + BUG_ON(regs != task_pt_regs(current));
>
> /*
> * If we stepped into a sysenter/syscall insn, it trapped in
> @@ -1463,17 +1569,20 @@ long syscall_trace_enter(struct pt_regs *regs)
> * do_debug() and we need to set it again to restore the user
> * state. If we entered on the slow path, TF was already set.
> */
> - if (test_thread_flag(TIF_SINGLESTEP))
> + if (work & _TIF_SINGLESTEP)
> regs->flags |= X86_EFLAGS_TF;
This is minor, I won't argue, but this can be moved into phase1(), afaics.
Oleg.
next prev parent reply other threads:[~2014-07-29 19:25 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-29 3:38 [PATCH v4 0/5] x86: two-phase syscall tracing and seccomp fastpath Andy Lutomirski
2014-07-29 3:38 ` [PATCH v4 1/5] x86,x32,audit: Fix x32's AUDIT_ARCH wrt audit Andy Lutomirski
2014-07-29 3:38 ` [PATCH v4 2/5] x86,entry: Only call user_exit if TIF_NOHZ Andy Lutomirski
2014-07-29 19:32 ` Oleg Nesterov
2014-07-30 16:43 ` Frederic Weisbecker
2014-07-30 17:23 ` Andy Lutomirski
2014-07-31 15:16 ` Frederic Weisbecker
2014-07-31 16:42 ` Oleg Nesterov
2014-07-31 16:49 ` Frederic Weisbecker
2014-07-31 16:54 ` Oleg Nesterov
2014-07-31 16:58 ` Oleg Nesterov
2014-07-31 17:17 ` Frederic Weisbecker
2014-07-29 3:38 ` [PATCH v4 3/5] x86: Split syscall_trace_enter into two phases Andy Lutomirski
2014-07-29 19:25 ` Oleg Nesterov [this message]
2014-07-29 3:38 ` [PATCH v4 4/5] x86_64, entry: Treat regs->ax the same in fastpath and slowpath syscalls Andy Lutomirski
2014-07-29 3:38 ` [PATCH v4 5/5] x86_64, entry: Use split-phase syscall_trace_enter for 64-bit syscalls Andy Lutomirski
2014-07-29 19:20 ` [PATCH v4 0/5] x86: two-phase syscall tracing and seccomp fastpath Oleg Nesterov
2014-07-29 20:54 ` Andy Lutomirski
2014-07-29 23:30 ` Andy Lutomirski
2014-07-30 15:32 ` Oleg Nesterov
2014-07-30 16:59 ` Frederic Weisbecker
2014-07-30 17:25 ` Andy Lutomirski
2014-07-31 16:56 ` H. Peter Anvin
2014-07-31 17:20 ` Frederic Weisbecker
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