From: shawn.guo@linaro.org (Shawn Guo)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: smp_twd: make twd_local_timer_of_register() no-op for nosmp
Date: Thu, 21 Feb 2013 20:44:21 +0800 [thread overview]
Message-ID: <1361450661-10324-1-git-send-email-shawn.guo@linaro.org> (raw)
When booting a SMP build kernel with nosmp on kernel cmdline, the
following fat warning will be hit.
------------[ cut here ]------------
WARNING: at arch/arm/kernel/smp_twd.c:345
twd_local_timer_of_register+0x7c/0x90()
twd_local_timer_of_register failed (-6)
Modules linked in:
Backtrace:
[<80011f14>] (dump_backtrace+0x0/0x10c) from [<8044dd30>]
(dump_stack+0x18/0x1c)
r7:805e9f58 r6:805ba84c r5:80539331 r4:00000159
[<8044dd18>] (dump_stack+0x0/0x1c) from [<80020fbc>]
(warn_slowpath_common+0x54/0x6c)
[<80020f68>] (warn_slowpath_common+0x0/0x6c) from [<80021078>]
(warn_slowpath_fmt+0x38/0x40)
r9:412fc09a r8:8fffffff r7:ffffffff r6:00000001 r5:80633b8c
r4:80b32da8
[<80021040>] (warn_slowpath_fmt+0x0/0x40) from [<805ba84c>]
(twd_local_timer_of_register+0x7c/0x90)
r3:fffffffa r2:8053934b
[<805ba7d0>] (twd_local_timer_of_register+0x0/0x90) from [<805c0bec>]
(imx6q_timer_init+0x18/0x4c)
r5:80633800 r4:8053b701
[<805c0bd4>] (imx6q_timer_init+0x0/0x4c) from [<805ba4e8>]
(time_init+0x28/0x38)
r5:80633800 r4:805dc0f4
[<805ba4c0>] (time_init+0x0/0x38) from [<805b6854>]
(start_kernel+0x1a0/0x310)
[<805b66b4>] (start_kernel+0x0/0x310) from [<10008044>] (0x10008044)
r8:1000406a r7:805f3f8c r6:805dc0c4 r5:805f0518 r4:10c5387d
---[ end trace 1b75b31a2719ed1c ]---
Check (!is_smp() || !setup_max_cpus) in twd_local_timer_of_register()
to make it be a no-op for the conditions, thus avoid above warning.
Reported-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
---
arch/arm/kernel/smp_twd.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c
index c092115..3f25650 100644
--- a/arch/arm/kernel/smp_twd.c
+++ b/arch/arm/kernel/smp_twd.c
@@ -22,6 +22,7 @@
#include <linux/of_irq.h>
#include <linux/of_address.h>
+#include <asm/smp_plat.h>
#include <asm/smp_twd.h>
#include <asm/localtimer.h>
@@ -373,6 +374,9 @@ void __init twd_local_timer_of_register(void)
struct device_node *np;
int err;
+ if (!is_smp() || !setup_max_cpus)
+ return;
+
np = of_find_matching_node(NULL, twd_of_match);
if (!np)
return;
--
1.7.9.5
reply other threads:[~2013-02-21 12:44 UTC|newest]
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