Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus

* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus:
  [MIPS] SMTC: Fix recursion in instant IPI replay code.
  [MIPS] BCM1480: Fix setting of irq affinity.
  [MIPS] do_page_fault() needs to use raw_smp_processor_id().
  [MIPS] SMTC: Fix false trigger of debug code on single VPE.
  [MIPS] SMTC: irq_{enter,leave} and kstats keeping for relayed timer ints.
  [MIPS] lockdep: Deal with interrupt disable hazard in TRACE_IRQFLAGS
  [MIPS] lockdep: Handle interrupts in R3000 style c0_status register.
  [MIPS] MV64340: Add missing prototype for mv64340_irq_init().
  [MIPS] MT: MIPS_MT_SMTC_INSTANT_REPLAY currently conflicts with PREEMPT.
  [MIPS] EV64120: Include <asm/irq.h> to fix warning.
  [MIPS] Ocelot: Fix warning.
  [MIPS] Ocelot: Give PMON_v1_setup a proper prototype.

9 files changed, 97 insertions, 21 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 656f0ca52782..c78b14380b3e 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -1606,7 +1606,7 @@ config MIPS_MT_FPAFF
 
 config MIPS_MT_SMTC_INSTANT_REPLAY
         bool "Low-latency Dispatch of Deferred SMTC IPIs"
-        depends on MIPS_MT_SMTC
+        depends on MIPS_MT_SMTC && !PREEMPT
         default y
         help
           SMTC pseudo-interrupts between TCs are deferred and queued
diff --git a/arch/mips/gt64120/momenco_ocelot/prom.c b/arch/mips/gt64120/momenco_ocelot/prom.c
index 78f393b2afd9..c71c85276c74 100644
--- a/arch/mips/gt64120/momenco_ocelot/prom.c
+++ b/arch/mips/gt64120/momenco_ocelot/prom.c
@@ -32,7 +32,6 @@ void __init prom_init(void)
         char **arg = (char **) fw_arg1;
         char **env = (char **) fw_arg2;
         struct callvectors *cv = (struct callvectors *) fw_arg3;
-        uint32_t tmp;
         int i;
 
         /* save the PROM vectors for debugging use */
diff --git a/arch/mips/gt64120/momenco_ocelot/setup.c b/arch/mips/gt64120/momenco_ocelot/setup.c
index 94f94ebbda6c..98b6fb38096d 100644
--- a/arch/mips/gt64120/momenco_ocelot/setup.c
+++ b/arch/mips/gt64120/momenco_ocelot/setup.c
@@ -79,7 +79,7 @@ static char reset_reason;
 static void __init setup_l3cache(unsigned long size);
 
 /* setup code for a handoff from a version 1 PMON 2000 PROM */
-void PMON_v1_setup()
+static void PMON_v1_setup(void)
 {
         /* A wired TLB entry for the GT64120A and the serial port. The
            GT64120A is going to be hit on every IRQ anyway - there's
diff --git a/arch/mips/kernel/entry.S b/arch/mips/kernel/entry.S
index 0b78fcbf044a..686249c5c328 100644
--- a/arch/mips/kernel/entry.S
+++ b/arch/mips/kernel/entry.S
@@ -121,7 +121,11 @@ FEXPORT(restore_partial)		# restore partial frame
         SAVE_AT
         SAVE_TEMP
         LONG_L  v0, PT_STATUS(sp)
-        and     v0, 1
+#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
+        and     v0, ST0_IEP
+#else
+        and     v0, ST0_IE
+#endif
         beqz    v0, 1f
         jal     trace_hardirqs_on
         b       2f
diff --git a/arch/mips/kernel/genex.S b/arch/mips/kernel/genex.S
index 83843a229be7..297bd56c2347 100644
--- a/arch/mips/kernel/genex.S
+++ b/arch/mips/kernel/genex.S
@@ -128,6 +128,37 @@ handle_vcei:
 
         .align  5
 NESTED(handle_int, PT_SIZE, sp)
+#ifdef CONFIG_TRACE_IRQFLAGS
+        /*
+         * Check to see if the interrupted code has just disabled
+         * interrupts and ignore this interrupt for now if so.
+         *
+         * local_irq_disable() disables interrupts and then calls
+         * trace_hardirqs_off() to track the state. If an interrupt is taken
+         * after interrupts are disabled but before the state is updated
+         * it will appear to restore_all that it is incorrectly returning with
+         * interrupts disabled
+         */
+        .set    push
+        .set    noat
+        mfc0    k0, CP0_STATUS
+#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
+        and     k0, ST0_IEP
+        bnez    k0, 1f
+
+        mfc0    k0, EP0_EPC
+        .set    noreorder
+        j       k0
+        rfe
+#else
+        and     k0, ST0_IE
+        bnez    k0, 1f
+
+        eret
+#endif
+1:
+        .set pop
+#endif
         SAVE_ALL
         CLI
         TRACE_IRQS_OFF
diff --git a/arch/mips/kernel/smtc.c b/arch/mips/kernel/smtc.c
index f253eda27fa3..5dcfab6b288e 100644
--- a/arch/mips/kernel/smtc.c
+++ b/arch/mips/kernel/smtc.c
@@ -4,6 +4,7 @@
 #include <linux/sched.h>
 #include <linux/cpumask.h>
 #include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
 #include <linux/module.h>
 
 #include <asm/cpu.h>
@@ -14,6 +15,7 @@
 #include <asm/hazards.h>
 #include <asm/mmu_context.h>
 #include <asm/smp.h>
+#include <asm/mips-boards/maltaint.h>
 #include <asm/mipsregs.h>
 #include <asm/cacheflush.h>
 #include <asm/time.h>
@@ -75,7 +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 */
@@ -168,7 +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];
@@ -501,8 +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;
@@ -607,7 +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);
 }
@@ -812,12 +821,15 @@ void ipi_decode(struct smtc_ipi *pipi)
         smtc_ipi_nq(&freeIPIq, pipi);
         switch (type_copy) {
         case SMTC_CLOCK_TICK:
+                irq_enter();
+                kstat_this_cpu.irqs[MIPSCPU_INT_BASE + MIPSCPU_INT_CPUCTR]++;
                 /* Invoke Clock "Interrupt" */
                 ipi_timer_latch[dest_copy] = 0;
 #ifdef CONFIG_SMTC_IDLE_HOOK_DEBUG
                 clock_hang_reported[dest_copy] = 0;
 #endif /* CONFIG_SMTC_IDLE_HOOK_DEBUG */
                 local_timer_interrupt(0, NULL);
+                irq_exit();
                 break;
         case LINUX_SMP_IPI:
                 switch ((int)arg_copy) {
@@ -965,8 +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");
 
@@ -984,10 +999,17 @@ static void setup_cross_vpe_interrupts(void)
 
 /*
  * SMTC-specific hacks invoked from elsewhere in the kernel.
+ *
+ * smtc_ipi_replay is called from raw_local_irq_restore which is only ever
+ * called with interrupts disabled.  We do rely on interrupts being disabled
+ * here because using spin_lock_irqsave()/spin_unlock_irqrestore() would
+ * result in a recursive call to raw_local_irq_restore().
  */
 
-void smtc_ipi_replay(void)
+static void __smtc_ipi_replay(void)
 {
+        unsigned int cpu = smp_processor_id();
+
         /*
          * To the extent that we've ever turned interrupts off,
          * we may have accumulated deferred IPIs.  This is subtle.
@@ -1002,17 +1024,30 @@ void smtc_ipi_replay(void)
          * is clear, and we'll handle it as a real pseudo-interrupt
          * and not a pseudo-pseudo interrupt.
          */
-        if (IPIQ[smp_processor_id()].depth > 0) {
-                struct smtc_ipi *pipi;
-                extern void self_ipi(struct smtc_ipi *);
+        if (IPIQ[cpu].depth > 0) {
+                while (1) {
+                        struct smtc_ipi_q *q = &IPIQ[cpu];
+                        struct smtc_ipi *pipi;
+                        extern void self_ipi(struct smtc_ipi *);
+
+                        spin_lock(&q->lock);
+                        pipi = __smtc_ipi_dq(q);
+                        spin_unlock(&q->lock);
+                        if (!pipi)
+                                break;
 
-                while ((pipi = smtc_ipi_dq(&IPIQ[smp_processor_id()]))) {
                         self_ipi(pipi);
-                        smtc_cpu_stats[smp_processor_id()].selfipis++;
+                        smtc_cpu_stats[cpu].selfipis++;
                 }
         }
 }
 
+void smtc_ipi_replay(void)
+{
+        raw_local_irq_disable();
+        __smtc_ipi_replay();
+}
+
 EXPORT_SYMBOL(smtc_ipi_replay);
 
 void smtc_idle_loop_hook(void)
@@ -1117,7 +1152,13 @@ void smtc_idle_loop_hook(void)
          * is in use, there should never be any.
          */
 #ifndef CONFIG_MIPS_MT_SMTC_INSTANT_REPLAY
-        smtc_ipi_replay();
+        {
+                unsigned long flags;
+
+                local_irq_save(flags);
+                __smtc_ipi_replay();
+                local_irq_restore(flags);
+        }
 #endif /* CONFIG_MIPS_MT_SMTC_INSTANT_REPLAY */
 }
 
diff --git a/arch/mips/mm/fault.c b/arch/mips/mm/fault.c
index 6f90e7ef66ac..f9c595dceba9 100644
--- a/arch/mips/mm/fault.c
+++ b/arch/mips/mm/fault.c
@@ -42,7 +42,7 @@ asmlinkage void do_page_fault(struct pt_regs *regs, unsigned long write,
         siginfo_t info;
 
 #if 0
-        printk("Cpu%d[%s:%d:%0*lx:%ld:%0*lx]\n", smp_processor_id(),
+        printk("Cpu%d[%s:%d:%0*lx:%ld:%0*lx]\n", raw_smp_processor_id(),
                current->comm, current->pid, field, address, write,
                field, regs->cp0_epc);
 #endif
@@ -165,7 +165,7 @@ no_context:
 
         printk(KERN_ALERT "CPU %d Unable to handle kernel paging request at "
                "virtual address %0*lx, epc == %0*lx, ra == %0*lx\n",
-               smp_processor_id(), field, address, field, regs->cp0_epc,
+               raw_smp_processor_id(), field, address, field, regs->cp0_epc,
                field,  regs->regs[31]);
         die("Oops", regs);
 
@@ -228,7 +228,7 @@ vmalloc_fault:
                 pmd_t *pmd, *pmd_k;
                 pte_t *pte_k;
 
-                pgd = (pgd_t *) pgd_current[smp_processor_id()] + offset;
+                pgd = (pgd_t *) pgd_current[raw_smp_processor_id()] + offset;
                 pgd_k = init_mm.pgd + offset;
 
                 if (!pgd_present(*pgd_k))
diff --git a/arch/mips/pci/pci-ev64120.c b/arch/mips/pci/pci-ev64120.c
index 9cd859ef1842..a84f594b5a18 100644
--- a/arch/mips/pci/pci-ev64120.c
+++ b/arch/mips/pci/pci-ev64120.c
@@ -1,4 +1,5 @@
 #include <linux/pci.h>
+#include <asm/irq.h>
 
 int __init pcibios_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
 {
diff --git a/arch/mips/sibyte/bcm1480/irq.c b/arch/mips/sibyte/bcm1480/irq.c
index 20af0f1bb7bf..ba0c4b776c85 100644
--- a/arch/mips/sibyte/bcm1480/irq.c
+++ b/arch/mips/sibyte/bcm1480/irq.c
@@ -141,11 +141,11 @@ static void bcm1480_set_affinity(unsigned int irq, cpumask_t mask)
         unsigned long flags;
         unsigned int irq_dirty;
 
-        i = first_cpu(mask);
-        if (next_cpu(i, mask) <= NR_CPUS) {
+        if (cpus_weight(mask) != 1) {
                 printk("attempted to set irq affinity for irq %d to multiple CPUs\n", irq);
                 return;
         }
+        i = first_cpu(mask);
 
         /* Convert logical CPU to physical CPU */
         cpu = cpu_logical_map(i);