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| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2009-03-26 15:23:56 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2009-03-26 15:24:08 +0100 |
| commit | 3324e60aafa9aeb1009878d45079b67367a5e2b6 (patch) | |
| tree | 7c7483b4d4c0996b30de899346b0070792e4f976 /arch | |
| parent | 431429ff788598a19c1a193b9fca3961b7f55916 (diff) | |
| download | linux-stable-3324e60aafa9aeb1009878d45079b67367a5e2b6.tar.gz linux-stable-3324e60aafa9aeb1009878d45079b67367a5e2b6.tar.bz2 linux-stable-3324e60aafa9aeb1009878d45079b67367a5e2b6.zip | |
[S390] lockdep: trace hardirq off in smp_send_stop
With lockdep we got the following trace after a panic:
Badness at /home/autobuild/BUILD/linux-2.6.28-20090204/kernel/lockdep.c:2878
[...]
Call Trace:
[<0000000000176334>] lock_acquire+0x54/0xbc
[<000000000050b4fe>] __atomic_notifier_call_chain+0x6e/0xdc
[<000000000050b59c>] atomic_notifier_call_chain+0x30/0x44
[<0000000000504274>] panic+0xd0/0x1e8
[...]
INFO: lockdep is turned off.
Last Breaking-Event-Address:
[<0000000000170e62>] check_flags+0xae/0x15c
possible reason: unannotated irqs-off.
lockdep is right. We missed a trace_hardirq_off in our smp_send_stop
function and smp_send_stop is called before the panic call chain.
Reported-by: Mijo <Safradin mijo@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/s390/kernel/smp.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index e279d0fbbbe8..a8858634dd05 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -32,6 +32,7 @@ #include <linux/delay.h> #include <linux/cache.h> #include <linux/interrupt.h> +#include <linux/irqflags.h> #include <linux/cpu.h> #include <linux/timex.h> #include <linux/bootmem.h> @@ -75,6 +76,7 @@ void smp_send_stop(void) /* Disable all interrupts/machine checks */ __load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK); + trace_hardirqs_off(); /* stop all processors */ for_each_online_cpu(cpu) { |