CRIS: remove SMP code

The CRIS SMP code cannot be built since there is no (and appears to
never have been) a CONFIG_SMP Kconfig option in arch/cris/. Remove it.

Signed-off-by: Rabin Vincent <[e-mail]>
Signed-off-by: Jesper Nilsson <[e-mail]>

arch/cris/Kconfig

···
 	select ARCH_WANT_IPC_PARSE_VERSION
 	select GENERIC_IRQ_SHOW
 	select GENERIC_IOMAP
-	select GENERIC_SMP_IDLE_THREAD if ETRAX_ARCH_V32
 	select GENERIC_CMOS_UPDATE
 	select MODULES_USE_ELF_RELA
 	select CLONE_BACKWARDS2

arch/cris/arch-v32/kernel/Makefile

···
 	   process.o ptrace.o setup.o signal.o traps.o time.o \
 	   cache.o cacheflush.o
 
-obj-$(CONFIG_SMP) += smp.o
 obj-$(CONFIG_ETRAX_KGDB) += kgdb.o kgdb_asm.o
 obj-$(CONFIG_ETRAX_FAST_TIMER) += fasttimer.o
 obj-$(CONFIG_MODULES)    += crisksyms.o

arch/cris/arch-v32/kernel/head.S

···
 
 	GIO_INIT
 
-#ifdef CONFIG_SMP
-secondary_cpu_entry: /* Entry point for secondary CPUs */
-	di
-#endif
-
 	;; Setup and enable the MMU. Use same configuration for both the data
 	;; and the instruction MMU.
 	;;
···
 	nop
 	nop
 
-#ifdef CONFIG_SMP
-	;; Read CPU ID
-	move    0, $srs
-	nop
-	nop
-	nop
-	move    $s12, $r0
-	cmpq    0, $r0
-	beq	master_cpu
-	nop
-slave_cpu:
-	; Time to boot-up. Get stack location provided by master CPU.
-	move.d  smp_init_current_idle_thread, $r1
-	move.d  [$r1], $sp
-	add.d	8192, $sp
-	move.d	ebp_start, $r0	; Defined in linker-script.
-	move	$r0, $ebp
-	jsr	smp_callin
-	nop
-master_cpu:
-	/* Set up entry point for secondary CPUs. The boot ROM has set up
-	 * EBP at start of internal memory. The CPU will get there
-	 * later when we issue an IPI to them... */
-	move.d MEM_INTMEM_START + IPI_INTR_VECT * 4, $r0
-	move.d secondary_cpu_entry, $r1
-	move.d $r1, [$r0]
-#endif
 	; Check if starting from DRAM (network->RAM boot or unpacked
 	; compressed kernel), or directly from flash.
 	lapcq	., $r0

arch/cris/arch-v32/kernel/irq.c

···
 static unsigned long irq_regs[NR_CPUS] =
 {
   regi_irq,
-#ifdef CONFIG_SMP
-  regi_irq2,
-#endif
 };
 
 #if NR_REAL_IRQS > 32

arch/cris/arch-v32/kernel/setup.c

···
 
 	info = &cpinfo[ARRAY_SIZE(cpinfo) - 1];
 
-#ifdef CONFIG_SMP
-	if (!cpu_online(cpu))
-		return 0;
-#endif
-
 	revision = rdvr();
 
 	for (i = 0; i < ARRAY_SIZE(cpinfo); i++) {

arch/cris/arch-v32/kernel/smp.c

···
-#include <linux/types.h>
-#include <asm/delay.h>
-#include <irq.h>
-#include <hwregs/intr_vect.h>
-#include <hwregs/intr_vect_defs.h>
-#include <asm/tlbflush.h>
-#include <asm/mmu_context.h>
-#include <hwregs/asm/mmu_defs_asm.h>
-#include <hwregs/supp_reg.h>
-#include <linux/atomic.h>
-
-#include <linux/err.h>
-#include <linux/init.h>
-#include <linux/timex.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/cpumask.h>
-#include <linux/interrupt.h>
-#include <linux/module.h>
-
-#define IPI_SCHEDULE 1
-#define IPI_CALL 2
-#define IPI_FLUSH_TLB 4
-#define IPI_BOOT 8
-
-#define FLUSH_ALL (void*)0xffffffff
-
-/* Vector of locks used for various atomic operations */
-spinlock_t cris_atomic_locks[] = {
-	[0 ... LOCK_COUNT - 1] = __SPIN_LOCK_UNLOCKED(cris_atomic_locks)
-};
-
-/* CPU masks */
-cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
-EXPORT_SYMBOL(phys_cpu_present_map);
-
-/* Variables used during SMP boot */
-volatile int cpu_now_booting = 0;
-volatile struct thread_info *smp_init_current_idle_thread;
-
-/* Variables used during IPI */
-static DEFINE_SPINLOCK(call_lock);
-static DEFINE_SPINLOCK(tlbstate_lock);
-
-struct call_data_struct {
-	void (*func) (void *info);
-	void *info;
-	int wait;
-};
-
-static struct call_data_struct * call_data;
-
-static struct mm_struct* flush_mm;
-static struct vm_area_struct* flush_vma;
-static unsigned long flush_addr;
-
-/* Mode registers */
-static unsigned long irq_regs[NR_CPUS] = {
-  regi_irq,
-  regi_irq2
-};
-
-static irqreturn_t crisv32_ipi_interrupt(int irq, void *dev_id);
-static int send_ipi(int vector, int wait, cpumask_t cpu_mask);
-static struct irqaction irq_ipi  = {
-	.handler = crisv32_ipi_interrupt,
-	.flags = 0,
-	.name = "ipi",
-};
-
-extern void cris_mmu_init(void);
-extern void cris_timer_init(void);
-
-/* SMP initialization */
-void __init smp_prepare_cpus(unsigned int max_cpus)
-{
-	int i;
-
-	/* From now on we can expect IPIs so set them up */
-	setup_irq(IPI_INTR_VECT, &irq_ipi);
-
-	/* Mark all possible CPUs as present */
-	for (i = 0; i < max_cpus; i++)
-		cpumask_set_cpu(i, &phys_cpu_present_map);
-}
-
-void smp_prepare_boot_cpu(void)
-{
-	/* PGD pointer has moved after per_cpu initialization so
-	 * update the MMU.
-	 */
-  	pgd_t **pgd;
-	pgd = (pgd_t**)&per_cpu(current_pgd, smp_processor_id());
-
-	SUPP_BANK_SEL(1);
-	SUPP_REG_WR(RW_MM_TLB_PGD, pgd);
-	SUPP_BANK_SEL(2);
-	SUPP_REG_WR(RW_MM_TLB_PGD, pgd);
-
-	set_cpu_online(0, true);
-	cpumask_set_cpu(0, &phys_cpu_present_map);
-	set_cpu_possible(0, true);
-}
-
-void __init smp_cpus_done(unsigned int max_cpus)
-{
-}
-
-/* Bring one cpu online.*/
-static int __init
-smp_boot_one_cpu(int cpuid, struct task_struct idle)
-{
-	unsigned timeout;
-	cpumask_t cpu_mask;
-
-	cpumask_clear(&cpu_mask);
-	task_thread_info(idle)->cpu = cpuid;
-
-	/* Information to the CPU that is about to boot */
-	smp_init_current_idle_thread = task_thread_info(idle);
-	cpu_now_booting = cpuid;
-
-	/* Kick it */
-	set_cpu_online(cpuid, true);
-	cpumask_set_cpu(cpuid, &cpu_mask);
-	send_ipi(IPI_BOOT, 0, cpu_mask);
-	set_cpu_online(cpuid, false);
-
-	/* Wait for CPU to come online */
-	for (timeout = 0; timeout < 10000; timeout++) {
-		if(cpu_online(cpuid)) {
-			cpu_now_booting = 0;
-			smp_init_current_idle_thread = NULL;
-			return 0; /* CPU online */
-		}
-		udelay(100);
-		barrier();
-	}
-
-	printk(KERN_CRIT "SMP: CPU:%d is stuck.\n", cpuid);
-	return -1;
-}
-
-/* Secondary CPUs starts using C here. Here we need to setup CPU
- * specific stuff such as the local timer and the MMU. */
-void __init smp_callin(void)
-{
-	int cpu = cpu_now_booting;
-	reg_intr_vect_rw_mask vect_mask = {0};
-
-	/* Initialise the idle task for this CPU */
-	atomic_inc(&init_mm.mm_count);
-	current->active_mm = &init_mm;
-
-	/* Set up MMU */
-	cris_mmu_init();
-	__flush_tlb_all();
-
-	/* Setup local timer. */
-	cris_timer_init();
-
-	/* Enable IRQ and idle */
-	REG_WR(intr_vect, irq_regs[cpu], rw_mask, vect_mask);
-	crisv32_unmask_irq(IPI_INTR_VECT);
-	crisv32_unmask_irq(TIMER0_INTR_VECT);
-	preempt_disable();
-	notify_cpu_starting(cpu);
-	local_irq_enable();
-
-	set_cpu_online(cpu, true);
-	cpu_startup_entry(CPUHP_ONLINE);
-}
-
-/* Stop execution on this CPU.*/
-void stop_this_cpu(void* dummy)
-{
-	local_irq_disable();
-	asm volatile("halt");
-}
-
-/* Other calls */
-void smp_send_stop(void)
-{
-	smp_call_function(stop_this_cpu, NULL, 0);
-}
-
-int setup_profiling_timer(unsigned int multiplier)
-{
-	return -EINVAL;
-}
-
-
-/* cache_decay_ticks is used by the scheduler to decide if a process
- * is "hot" on one CPU. A higher value means a higher penalty to move
- * a process to another CPU. Our cache is rather small so we report
- * 1 tick.
- */
-unsigned long cache_decay_ticks = 1;
-
-int __cpu_up(unsigned int cpu, struct task_struct *tidle)
-{
-	smp_boot_one_cpu(cpu, tidle);
-	return cpu_online(cpu) ? 0 : -ENOSYS;
-}
-
-void smp_send_reschedule(int cpu)
-{
-	cpumask_t cpu_mask;
-	cpumask_clear(&cpu_mask);
-	cpumask_set_cpu(cpu, &cpu_mask);
-	send_ipi(IPI_SCHEDULE, 0, cpu_mask);
-}
-
-/* TLB flushing
- *
- * Flush needs to be done on the local CPU and on any other CPU that
- * may have the same mapping. The mm->cpu_vm_mask is used to keep track
- * of which CPUs that a specific process has been executed on.
- */
-void flush_tlb_common(struct mm_struct* mm, struct vm_area_struct* vma, unsigned long addr)
-{
-	unsigned long flags;
-	cpumask_t cpu_mask;
-
-	spin_lock_irqsave(&tlbstate_lock, flags);
-	cpu_mask = (mm == FLUSH_ALL ? cpu_all_mask : *mm_cpumask(mm));
-	cpumask_clear_cpu(smp_processor_id(), &cpu_mask);
-	flush_mm = mm;
-	flush_vma = vma;
-	flush_addr = addr;
-	send_ipi(IPI_FLUSH_TLB, 1, cpu_mask);
-	spin_unlock_irqrestore(&tlbstate_lock, flags);
-}
-
-void flush_tlb_all(void)
-{
-	__flush_tlb_all();
-	flush_tlb_common(FLUSH_ALL, FLUSH_ALL, 0);
-}
-
-void flush_tlb_mm(struct mm_struct *mm)
-{
-	__flush_tlb_mm(mm);
-	flush_tlb_common(mm, FLUSH_ALL, 0);
-	/* No more mappings in other CPUs */
-	cpumask_clear(mm_cpumask(mm));
-	cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm));
-}
-
-void flush_tlb_page(struct vm_area_struct *vma,
-			   unsigned long addr)
-{
-	__flush_tlb_page(vma, addr);
-	flush_tlb_common(vma->vm_mm, vma, addr);
-}
-
-/* Inter processor interrupts
- *
- * The IPIs are used for:
- *   * Force a schedule on a CPU
- *   * FLush TLB on other CPUs
- *   * Call a function on other CPUs
- */
-
-int send_ipi(int vector, int wait, cpumask_t cpu_mask)
-{
-	int i = 0;
-	reg_intr_vect_rw_ipi ipi = REG_RD(intr_vect, irq_regs[i], rw_ipi);
-	int ret = 0;
-
-	/* Calculate CPUs to send to. */
-	cpumask_and(&cpu_mask, &cpu_mask, cpu_online_mask);
-
-	/* Send the IPI. */
-	for_each_cpu(i, &cpu_mask)
-	{
-		ipi.vector |= vector;
-		REG_WR(intr_vect, irq_regs[i], rw_ipi, ipi);
-	}
-
-	/* Wait for IPI to finish on other CPUS */
-	if (wait) {
-		for_each_cpu(i, &cpu_mask) {
-                        int j;
-                        for (j = 0 ; j < 1000; j++) {
-				ipi = REG_RD(intr_vect, irq_regs[i], rw_ipi);
-				if (!ipi.vector)
-					break;
-				udelay(100);
-			}
-
-			/* Timeout? */
-			if (ipi.vector) {
-				printk("SMP call timeout from %d to %d\n", smp_processor_id(), i);
-				ret = -ETIMEDOUT;
-				dump_stack();
-			}
-		}
-	}
-	return ret;
-}
-
-/*
- * You must not call this function with disabled interrupts or from a
- * hardware interrupt handler or from a bottom half handler.
- */
-int smp_call_function(void (*func)(void *info), void *info, int wait)
-{
-	cpumask_t cpu_mask;
-	struct call_data_struct data;
-	int ret;
-
-	cpumask_setall(&cpu_mask);
-	cpumask_clear_cpu(smp_processor_id(), &cpu_mask);
-
-	WARN_ON(irqs_disabled());
-
-	data.func = func;
-	data.info = info;
-	data.wait = wait;
-
-	spin_lock(&call_lock);
-	call_data = &data;
-	ret = send_ipi(IPI_CALL, wait, cpu_mask);
-	spin_unlock(&call_lock);
-
-	return ret;
-}
-
-irqreturn_t crisv32_ipi_interrupt(int irq, void *dev_id)
-{
-	void (*func) (void *info) = call_data->func;
-	void *info = call_data->info;
-	reg_intr_vect_rw_ipi ipi;
-
-	ipi = REG_RD(intr_vect, irq_regs[smp_processor_id()], rw_ipi);
-
-	if (ipi.vector & IPI_SCHEDULE) {
-		scheduler_ipi();
-	}
-	if (ipi.vector & IPI_CALL) {
-		func(info);
-	}
-	if (ipi.vector & IPI_FLUSH_TLB) {
-		if (flush_mm == FLUSH_ALL)
-			__flush_tlb_all();
-		else if (flush_vma == FLUSH_ALL)
-			__flush_tlb_mm(flush_mm);
-		else
-			__flush_tlb_page(flush_vma, flush_addr);
-	}
-
-	ipi.vector = 0;
-	REG_WR(intr_vect, irq_regs[smp_processor_id()], rw_ipi, ipi);
-
-	return IRQ_HANDLED;
-}
-

arch/cris/arch-v32/kernel/time.c

···
 unsigned long timer_regs[NR_CPUS] =
 {
 	regi_timer0,
-#ifdef CONFIG_SMP
-	regi_timer2
-#endif
 };
 
 extern int set_rtc_mmss(unsigned long nowtime);

arch/cris/arch-v32/lib/Makefile

···
 #
 
 lib-y  = checksum.o checksumcopy.o string.o usercopy.o memset.o \
-	csumcpfruser.o spinlock.o delay.o strcmp.o
+	csumcpfruser.o delay.o strcmp.o
 

arch/cris/arch-v32/lib/spinlock.S

···
-;; Core of the spinlock implementation
-;;
-;; Copyright (C) 2004 Axis Communications AB.
-;;
-;; Author: Mikael Starvik
-
-
-	.global cris_spin_lock
-	.type   cris_spin_lock,@function
-	.global cris_spin_trylock
-	.type   cris_spin_trylock,@function
-
-	.text
-
-cris_spin_lock:
-	clearf	p
-1:	test.b	[$r10]
-	beq	1b
-	clearf	p
-	ax
-	clear.b [$r10]
-	bcs     1b
-	clearf	p
-	ret
-	nop
-
-	.size   cris_spin_lock, . - cris_spin_lock
-
-cris_spin_trylock:
-	clearf	p
-1:	move.b	[$r10], $r11
-	ax
-	clear.b [$r10]
-        bcs	1b
-        clearf	p
-	ret
-	movu.b	$r11,$r10
-
-	.size   cris_spin_trylock, . - cris_spin_trylock
-

arch/cris/arch-v32/mm/init.c

···
 	 */
 	per_cpu(current_pgd, smp_processor_id()) = init_mm.pgd;
 
-#ifdef CONFIG_SMP
-	{
-		pgd_t **pgd;
-		pgd = (pgd_t**)&per_cpu(current_pgd, smp_processor_id());
-		SUPP_BANK_SEL(1);
-		SUPP_REG_WR(RW_MM_TLB_PGD, pgd);
-		SUPP_BANK_SEL(2);
-		SUPP_REG_WR(RW_MM_TLB_PGD, pgd);
-	}
-#endif
-
 	/* Initialise the TLB. Function found in tlb.c. */
 	tlb_init();
 

arch/cris/arch-v32/mm/mmu.S

···
 	move.d	$r0, [$r1]	; last_refill_cause = rw_mm_cause
 
 3:	; Probably not in a loop, continue normal processing
-#ifdef CONFIG_SMP
-	move    $s7, $acr	; PGD
-#else
 	move.d  current_pgd, $acr ; PGD
-#endif
 	; Look up PMD in PGD
 	lsrq	24, $r0	; Get PMD index into PGD (bit 24-31)
 	move.d  [$acr], $acr	; PGD for the current process

arch/cris/include/arch-v32/arch/atomic.h

···
 #ifndef __ASM_CRIS_ARCH_ATOMIC__
 #define __ASM_CRIS_ARCH_ATOMIC__
 
-#include <linux/spinlock_types.h>
-
-extern void cris_spin_unlock(void *l, int val);
-extern void cris_spin_lock(void *l);
-extern int cris_spin_trylock(void* l);
-
-#ifndef CONFIG_SMP
 #define cris_atomic_save(addr, flags) local_irq_save(flags);
 #define cris_atomic_restore(addr, flags) local_irq_restore(flags);
-#else
-
-extern spinlock_t cris_atomic_locks[];
-#define LOCK_COUNT 128
-#define HASH_ADDR(a) (((int)a) & 127)
-
-#define cris_atomic_save(addr, flags) \
-  local_irq_save(flags); \
-  cris_spin_lock((void *)&cris_atomic_locks[HASH_ADDR(addr)].raw_lock.slock);
-
-#define cris_atomic_restore(addr, flags) \
-  { \
-    spinlock_t *lock = (void*)&cris_atomic_locks[HASH_ADDR(addr)]; \
-    __asm__ volatile ("move.d %1,%0" \
-			: "=m" (lock->raw_lock.slock) \
-			: "r" (1) \
-			: "memory"); \
-    local_irq_restore(flags); \
-  }
-
-#endif
 
 #endif
 

arch/cris/include/arch-v32/arch/spinlock.h

···
-#ifndef __ASM_ARCH_SPINLOCK_H
-#define __ASM_ARCH_SPINLOCK_H
-
-#include <linux/spinlock_types.h>
-
-#define RW_LOCK_BIAS 0x01000000
-
-extern void cris_spin_unlock(void *l, int val);
-extern void cris_spin_lock(void *l);
-extern int cris_spin_trylock(void *l);
-
-static inline int arch_spin_is_locked(arch_spinlock_t *x)
-{
-	return *(volatile signed char *)(&(x)->slock) <= 0;
-}
-
-static inline void arch_spin_unlock(arch_spinlock_t *lock)
-{
-	__asm__ volatile ("move.d %1,%0" \
-			  : "=m" (lock->slock) \
-			  : "r" (1) \
-			  : "memory");
-}
-
-static inline void arch_spin_unlock_wait(arch_spinlock_t *lock)
-{
-	while (arch_spin_is_locked(lock))
-		cpu_relax();
-}
-
-static inline int arch_spin_trylock(arch_spinlock_t *lock)
-{
-	return cris_spin_trylock((void *)&lock->slock);
-}
-
-static inline void arch_spin_lock(arch_spinlock_t *lock)
-{
-	cris_spin_lock((void *)&lock->slock);
-}
-
-static inline void
-arch_spin_lock_flags(arch_spinlock_t *lock, unsigned long flags)
-{
-	arch_spin_lock(lock);
-}
-
-/*
- * Read-write spinlocks, allowing multiple readers
- * but only one writer.
- *
- * NOTE! it is quite common to have readers in interrupts
- * but no interrupt writers. For those circumstances we
- * can "mix" irq-safe locks - any writer needs to get a
- * irq-safe write-lock, but readers can get non-irqsafe
- * read-locks.
- *
- */
-
-static inline int arch_read_can_lock(arch_rwlock_t *x)
-{
-	return (int)(x)->lock > 0;
-}
-
-static inline int arch_write_can_lock(arch_rwlock_t *x)
-{
-	return (x)->lock == RW_LOCK_BIAS;
-}
-
-static  inline void arch_read_lock(arch_rwlock_t *rw)
-{
-	arch_spin_lock(&rw->slock);
-	while (rw->lock == 0);
-	rw->lock--;
-	arch_spin_unlock(&rw->slock);
-}
-
-static  inline void arch_write_lock(arch_rwlock_t *rw)
-{
-	arch_spin_lock(&rw->slock);
-	while (rw->lock != RW_LOCK_BIAS);
-	rw->lock = 0;
-	arch_spin_unlock(&rw->slock);
-}
-
-static  inline void arch_read_unlock(arch_rwlock_t *rw)
-{
-	arch_spin_lock(&rw->slock);
-	rw->lock++;
-	arch_spin_unlock(&rw->slock);
-}
-
-static  inline void arch_write_unlock(arch_rwlock_t *rw)
-{
-	arch_spin_lock(&rw->slock);
-	while (rw->lock != RW_LOCK_BIAS);
-	rw->lock = RW_LOCK_BIAS;
-	arch_spin_unlock(&rw->slock);
-}
-
-static  inline int arch_read_trylock(arch_rwlock_t *rw)
-{
-	int ret = 0;
-	arch_spin_lock(&rw->slock);
-	if (rw->lock != 0) {
-		rw->lock--;
-		ret = 1;
-	}
-	arch_spin_unlock(&rw->slock);
-	return ret;
-}
-
-static  inline int arch_write_trylock(arch_rwlock_t *rw)
-{
-	int ret = 0;
-	arch_spin_lock(&rw->slock);
-	if (rw->lock == RW_LOCK_BIAS) {
-		rw->lock = 0;
-		ret = 1;
-	}
-	arch_spin_unlock(&rw->slock);
-	return ret;
-}
-
-#define _raw_read_lock_flags(lock, flags) _raw_read_lock(lock)
-#define _raw_write_lock_flags(lock, flags) _raw_write_lock(lock)
-
-#define arch_spin_relax(lock)	cpu_relax()
-#define arch_read_relax(lock)	cpu_relax()
-#define arch_write_relax(lock)	cpu_relax()
-
-#endif /* __ASM_ARCH_SPINLOCK_H */

arch/cris/include/asm/cmpxchg.h

···
 			(unsigned long)(n), sizeof(*(ptr))))
 #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
 
-#ifndef CONFIG_SMP
 #include <asm-generic/cmpxchg.h>
-#endif
 
 #endif /* __ASM_CRIS_CMPXCHG__ */

arch/cris/include/asm/smp.h

···
-#ifndef __ASM_SMP_H
-#define __ASM_SMP_H
-
-#include <linux/cpumask.h>
-
-extern cpumask_t phys_cpu_present_map;
-
-#define raw_smp_processor_id() (current_thread_info()->cpu)
-
-#endif

arch/cris/include/asm/spinlock.h

···
-#include <arch/spinlock.h>

arch/cris/include/asm/tlbflush.h

···
 extern void __flush_tlb_page(struct vm_area_struct *vma,
 			   unsigned long addr);
 
-#ifdef CONFIG_SMP
-extern void flush_tlb_all(void);
-extern void flush_tlb_mm(struct mm_struct *mm);
-extern void flush_tlb_page(struct vm_area_struct *vma, 
-			   unsigned long addr);
-#else
 #define flush_tlb_all __flush_tlb_all
 #define flush_tlb_mm __flush_tlb_mm
 #define flush_tlb_page __flush_tlb_page
-#endif
 
 static inline void flush_tlb_range(struct vm_area_struct * vma, unsigned long start, unsigned long end)
 {