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authorDavid S. Miller <davem@davemloft.net>2008-04-25 03:11:37 -0700
committerDavid S. Miller <davem@davemloft.net>2008-04-25 03:11:37 -0700
commit2664ef44cf5053d2b7dff01cecac70bc601a5f68 (patch)
treec2f5d5533647885f3580c565870d2959dbb204d2 /arch/sparc64
parent020cfb05f2c594c778537159bd45ea5efb0c5e0d (diff)
downloadblackbird-op-linux-2664ef44cf5053d2b7dff01cecac70bc601a5f68.tar.gz
blackbird-op-linux-2664ef44cf5053d2b7dff01cecac70bc601a5f68.zip
[SPARC64]: Wrap SMP IPIs with irq_enter()/irq_exit().
Otherwise all sorts of bad things can happen, including spurious softlockup reports. Other platforms have this same bug, in one form or another, just don't see the issue because they don't sleep as long as sparc64 can in NOHZ. Thanks to some brilliant debugging by Peter Zijlstra. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64')
-rw-r--r--arch/sparc64/kernel/smp.c27
1 files changed, 22 insertions, 5 deletions
diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index 524b88920947..409dd71f2738 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -866,14 +866,21 @@ void smp_call_function_client(int irq, struct pt_regs *regs)
void *info = call_data->info;
clear_softint(1 << irq);
+
+ irq_enter();
+
+ if (!call_data->wait) {
+ /* let initiator proceed after getting data */
+ atomic_inc(&call_data->finished);
+ }
+
+ func(info);
+
+ irq_exit();
+
if (call_data->wait) {
/* let initiator proceed only after completion */
- func(info);
atomic_inc(&call_data->finished);
- } else {
- /* let initiator proceed after getting data */
- atomic_inc(&call_data->finished);
- func(info);
}
}
@@ -1032,7 +1039,9 @@ void smp_receive_signal(int cpu)
void smp_receive_signal_client(int irq, struct pt_regs *regs)
{
+ irq_enter();
clear_softint(1 << irq);
+ irq_exit();
}
void smp_new_mmu_context_version_client(int irq, struct pt_regs *regs)
@@ -1040,6 +1049,8 @@ void smp_new_mmu_context_version_client(int irq, struct pt_regs *regs)
struct mm_struct *mm;
unsigned long flags;
+ irq_enter();
+
clear_softint(1 << irq);
/* See if we need to allocate a new TLB context because
@@ -1059,6 +1070,8 @@ void smp_new_mmu_context_version_client(int irq, struct pt_regs *regs)
load_secondary_context(mm);
__flush_tlb_mm(CTX_HWBITS(mm->context),
SECONDARY_CONTEXT);
+
+ irq_exit();
}
void smp_new_mmu_context_version(void)
@@ -1217,6 +1230,8 @@ void smp_penguin_jailcell(int irq, struct pt_regs *regs)
{
clear_softint(1 << irq);
+ irq_enter();
+
preempt_disable();
__asm__ __volatile__("flushw");
@@ -1229,6 +1244,8 @@ void smp_penguin_jailcell(int irq, struct pt_regs *regs)
prom_world(0);
preempt_enable();
+
+ irq_exit();
}
/* /proc/profile writes can call this, don't __init it please. */
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