linux-kernel - [PATCH] kernel/watchdog.c : fix smp_processor

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 25 Jul 2012 12:39:45 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Sameer Nanda <snanda@...omium.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Ming Lei <ming.lei@...onical.com>
Subject: [PATCH] kernel/watchdog.c : fix smp_processor_id() warning

Use raw_smp_processor_id in lockup_detector_bootcpu_resume()
because it is enough when non-boot CPUs are offline.

This patch fixes the following warning when DEBUG_PREEMPT
is enabled.

[  168.259429] BUG: using smp_processor_id() in preemptible [00000000] code: pm/1577
[  168.259460] caller is lockup_detector_bootcpu_resume+0x8/0x48
[  168.259490] [<c001558c>] (unwind_backtrace+0x0/0x11c) from [<c0296874>] (debug_smp_processor_id+0xbc/0xf0)
[  168.259521] [<c0296874>] (debug_smp_processor_id+0xbc/0xf0) from [<c0090114>] (lockup_detector_bootcpu_res
ume+0x8/0x48)
[  168.259552] [<c0090114>] (lockup_detector_bootcpu_resume+0x8/0x48) from [<c006facc>] (suspend_devices_and_
enter+0x1f8/0x358)
[  168.259552] [<c006facc>] (suspend_devices_and_enter+0x1f8/0x358) from [<c006fd68>] (pm_suspend+0x13c/0x204
)
[  168.259582] [<c006fd68>] (pm_suspend+0x13c/0x204) from [<c006f0d0>] (state_store+0xb0/0xd4)
[  168.259582] [<c006f0d0>] (state_store+0xb0/0xd4) from [<c028a3d8>] (kobj_attr_store+0x14/0x20)
[  168.259613] [<c028a3d8>] (kobj_attr_store+0x14/0x20) from [<c014d344>] (sysfs_write_file+0x10c/0x140)
[  168.259643] [<c014d344>] (sysfs_write_file+0x10c/0x140) from [<c00f5a88>] (vfs_write+0xb0/0x138)
[  168.259643] [<c00f5a88>] (vfs_write+0xb0/0x138) from [<c00f5ce8>] (sys_write+0x3c/0x68)
[  168.259674] [<c00f5ce8>] (sys_write+0x3c/0x68) from [<c000e020>] (ret_fast_syscall+0x0/0x48)
[  168.260375] Enabling non-boot CPUs ...

Signed-off-by: Ming Lei <ming.lei@...onical.com>
---
 kernel/watchdog.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 69add8a..7ddb11b 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -623,7 +623,7 @@ static struct notifier_block cpu_nfb = {
  */
 void lockup_detector_bootcpu_resume(void)
 {
-	void *cpu = (void *)(long)smp_processor_id();
+	void *cpu = (void *)(long)raw_smp_processor_id();
 
 	cpu_callback(&cpu_nfb, CPU_DEAD_FROZEN, cpu);
 	cpu_callback(&cpu_nfb, CPU_UP_PREPARE_FROZEN, cpu);
-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/