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From: (Shawn Guo)
Subject: [PATCH] ARM: smp_twd: change WARN() to pr_warn() on local timer register failure
Date: Thu, 21 Feb 2013 16:37:57 +0800
Message-ID: <> (raw)

When booting a SMP build kernel with nosmp on kernel cmdline, the
following fat warning will be hit.  Since the local timer registeration
failure is expected for such boot condition, a normal pr_warn message
should be good enough for the failure.

------------[ cut here ]------------
WARNING: at arch/arm/kernel/smp_twd.c:345
twd_local_timer_of_register failed (-6)
Modules linked in:
[<80011f14>] (dump_backtrace+0x0/0x10c) from [<8044dd30>]
 r7:805e9f58 r6:805ba84c r5:80539331 r4:00000159
[<8044dd18>] (dump_stack+0x0/0x1c) from [<80020fbc>]
[<80020f68>] (warn_slowpath_common+0x0/0x6c) from [<80021078>]
 r9:412fc09a r8:8fffffff r7:ffffffff r6:00000001 r5:80633b8c
[<80021040>] (warn_slowpath_fmt+0x0/0x40) from [<805ba84c>]
 r3:fffffffa r2:8053934b
[<805ba7d0>] (twd_local_timer_of_register+0x0/0x90) from [<805c0bec>]
 r5:80633800 r4:8053b701
[<805c0bd4>] (imx6q_timer_init+0x0/0x4c) from [<805ba4e8>]
 r5:80633800 r4:805dc0f4
[<805ba4c0>] (time_init+0x0/0x38) from [<805b6854>]
[<805b66b4>] (start_kernel+0x0/0x310) from [<10008044>] (0x10008044)
 r8:1000406a r7:805f3f8c r6:805dc0c4 r5:805f0518 r4:10c5387d
---[ end trace 1b75b31a2719ed1c ]---

Reported-by: Dirk Behme <>
Signed-off-by: Shawn Guo <>
 arch/arm/kernel/smp_twd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c
index c092115..f796b83 100644
--- a/arch/arm/kernel/smp_twd.c
+++ b/arch/arm/kernel/smp_twd.c
@@ -392,6 +392,6 @@ void __init twd_local_timer_of_register(void)
 	err = twd_local_timer_common_register(np);
-	WARN(err, "twd_local_timer_of_register failed (%d)\n", err);
+	pr_warn("twd_local_timer_of_register failed (%d)\n", err);

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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-21  8:37 Shawn Guo [this message]
2013-02-21 11:31 ` Russell King - ARM Linux

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