From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
williams@redhat.com,
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
Namhyung Kim <namhyung@kernel.org>,
Ingo Molnar <mingo@redhat.com>
Subject: Re: [PATCH 2/2] ftrace/x86/extable: Add is_ftrace_trampoline() function
Date: Tue, 18 Nov 2014 23:15:16 -0500 [thread overview]
Message-ID: <20141118231516.2c3a7bdb@gandalf.local.home> (raw)
In-Reply-To: <20141119034829.497125839@goodmis.org>
On Tue, 18 Nov 2014 22:33:33 -0500
Steven Rostedt <rostedt@goodmis.org> wrote:
> +/*
> + * This is used by __kernel_text_address() to return true if the
> + * the address is on a dynamically allocated trampoline that would
> + * not return true for either core_kernel_text() or
> + * is_module_text_address().
> + */
> +bool is_ftrace_trampoline(unsigned long addr)
> +{
> + struct ftrace_ops *op;
> +
> + do_for_each_ftrace_op(op, ftrace_ops_list) {
> + /*
> + * This is to check for dynamically allocated trampolines.
> + * Trampolines that are in kernel text will have
> + * core_kernel_text() return true.
> + */
> + if (op->trampoline && op->trampoline_size)
> + if (addr >= op->trampoline &&
> + addr < op->trampoline + op->trampoline_size)
> + return true;
> + } while_for_each_ftrace_op(op);
> +
> + return false;
> +}
> +
Hmm, preemption should be disabled here. We can't guarantee that the
caller will have that. Will update.
-- Steve
next prev parent reply other threads:[~2014-11-19 4:15 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-19 3:33 [PATCH 0/2] ftrace: Fix stack tracing issues Steven Rostedt
2014-11-19 3:33 ` [PATCH 1/2] ftrace/x86: Add frames pointers to trampoline as necessary Steven Rostedt
2014-11-19 18:26 ` Thomas Gleixner
2014-11-19 18:38 ` Steven Rostedt
2014-11-19 3:33 ` [PATCH 2/2] ftrace/x86/extable: Add is_ftrace_trampoline() function Steven Rostedt
2014-11-19 4:15 ` Steven Rostedt [this message]
2014-11-19 8:16 ` Namhyung Kim
2014-11-19 13:36 ` Steven Rostedt
2014-11-19 15:37 ` Steven Rostedt
2014-11-19 18:29 ` Thomas Gleixner
2014-11-19 18:39 ` Steven Rostedt
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