Commit 2664ef44 authored by David S. Miller's avatar David S. Miller
Browse files

[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: default avatarDavid S. Miller <davem@davemloft.net>
parent 020cfb05
......@@ -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. */
......
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment