[MIPS] SMTC: Fix false trigger of debug code on single VPE.

Make smtc_setup_irq() update the list of interrupts which need to be
watched by the debug code itself.  Also there is no need to initialize the
IPI swint when running with a single VPE, so don't initialize it.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 15 insertions, 5 deletions

diff --git a/arch/mips/kernel/smtc.c b/arch/mips/kernel/smtc.c
index cba17a8f53d..e50fe20571f 100644
--- a/arch/mips/kernel/smtc.c
+++ b/arch/mips/kernel/smtc.c
@@ -77,7 +77,7 @@ static struct smtc_ipi_q freeIPIq;
 
 void ipi_decode(struct smtc_ipi *);
 static void post_direct_ipi(int cpu, struct smtc_ipi *pipi);
-static void setup_cross_vpe_interrupts(void);
+static void setup_cross_vpe_interrupts(unsigned int nvpe);
 void init_smtc_stats(void);
 
 /* Global SMTC Status */
@@ -170,7 +170,10 @@ __setup("tintq=", tintq);
 
 int imstuckcount[2][8];
 /* vpemask represents IM/IE bits of per-VPE Status registers, low-to-high */
-int vpemask[2][8] = {{0,1,1,0,0,0,0,1},{0,1,0,0,0,0,0,1}};
+int vpemask[2][8] = {
+        {0, 0, 1, 0, 0, 0, 0, 1},
+        {0, 0, 0, 0, 0, 0, 0, 1}
+};
 int tcnoprog[NR_CPUS];
 static atomic_t idle_hook_initialized = {0};
 static int clock_hang_reported[NR_CPUS];
@@ -503,8 +506,7 @@ void mipsmt_prepare_cpus(void)
 
         /* If we have multiple VPEs running, set up the cross-VPE interrupt */
 
-        if (nvpe > 1)
-                setup_cross_vpe_interrupts();
+        setup_cross_vpe_interrupts(nvpe);
 
         /* Set up queue of free IPI "messages". */
         nipi = NR_CPUS * IPIBUF_PER_CPU;
@@ -609,7 +611,12 @@ void smtc_cpus_done(void)
 int setup_irq_smtc(unsigned int irq, struct irqaction * new,
                         unsigned long hwmask)
 {
+        unsigned int vpe = current_cpu_data.vpe_id;
+
         irq_hwmask[irq] = hwmask;
+#ifdef CONFIG_SMTC_IDLE_HOOK_DEBUG
+        vpemask[vpe][irq - MIPSCPU_INT_BASE] = 1;
+#endif
 
         return setup_irq(irq, new);
 }
@@ -970,8 +977,11 @@ static void ipi_irq_dispatch(void)
 
 static struct irqaction irq_ipi;
 
-static void setup_cross_vpe_interrupts(void)
+static void setup_cross_vpe_interrupts(unsigned int nvpe)
 {
+        if (nvpe < 1)
+                return;
+
         if (!cpu_has_vint)
                 panic("SMTC Kernel requires Vectored Interupt support");