linux-kernel - Testing tracer wakeup: .. no entries found ..FAILED!

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Date:	Wed, 25 Jul 2012 09:31:16 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Steven Rostedt <srostedt@...hat.com>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Testing tracer wakeup: .. no entries found ..FAILED!

Steven,

In another kconfig (x86_64-allyesdebian), the "no entries found" will
happen in about 1/10 boots. Mostly it's "irqsoff" not found, and can
also be this "wakeup":

[   23.408441] Testing tracer wakeup: .. no entries found ..FAILED!
[   25.733327] ------------[ cut here ]------------
[   25.734529] WARNING: at /c/kernel-tests/src/stable/kernel/trace/trace.c:834 register_tracer+0x19e/0x276()
[   25.737170] Hardware name: Bochs
[   25.738228] Modules linked in:
[   25.739383] Pid: 1, comm: swapper/0 Not tainted 3.5.0+ #1404
[   25.740960] Call Trace:
[   25.742151]  [<ffffffff81091271>] warn_slowpath_common+0x83/0x9c
[   25.745383]  [<ffffffff810912a4>] warn_slowpath_null+0x1a/0x1c
[   25.749132]  [<ffffffff8111d977>] register_tracer+0x19e/0x276
[   25.751698]  [<ffffffff8416d033>] ? init_irqsoff_tracer+0x14/0x14
[   25.755494]  [<ffffffff8416d043>] init_wakeup_tracer+0x10/0x22
[   25.759205]  [<ffffffff81002099>] do_one_initcall+0x7f/0x13a
[   25.762639]  [<ffffffff8414dcf2>] kernel_init+0x141/0x1c5
[   25.765469]  [<ffffffff8414d590>] ? do_early_param+0x8c/0x8c
[   25.769294]  [<ffffffff82c05534>] kernel_thread_helper+0x4/0x10
[   25.773081]  [<ffffffff82bfd730>] ? retint_restore_args+0x13/0x13
[   25.776405]  [<ffffffff8414dbb1>] ? start_kernel+0x3cf/0x3cf
[   25.780117]  [<ffffffff82c05530>] ? gs_change+0x13/0x13

Thanks,
Fengguang

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