6 files changed, 13 insertions, 59 deletions
diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
index 4df1f8c9d170..cf2a6fd7dff8 100644
--- a/arch/csky/Kconfig
+++ b/arch/csky/Kconfig
@@ -96,6 +96,8 @@ config CSKY
 	select HAVE_REGS_AND_STACK_ACCESS_API
 	select HAVE_STACKPROTECTOR
 	select HAVE_SYSCALL_TRACEPOINTS
+	select HOTPLUG_CORE_SYNC_DEAD if HOTPLUG_CPU
+	select LOCK_MM_AND_FIND_VMA
 	select MAY_HAVE_SPARSE_IRQ
 	select MODULES_USE_ELF_RELA if MODULES
 	select OF
diff --git a/arch/csky/include/asm/atomic.h b/arch/csky/include/asm/atomic.h
index 60406ef9c2bb..4dab44f6143a 100644
--- a/arch/csky/include/asm/atomic.h
+++ b/arch/csky/include/asm/atomic.h
@@ -195,41 +195,6 @@ arch_atomic_dec_if_positive(atomic_t *v)
 }
 #define arch_atomic_dec_if_positive arch_atomic_dec_if_positive
 
-#define ATOMIC_OP()							\
-static __always_inline							\
-int arch_atomic_xchg_relaxed(atomic_t *v, int n)			\
-{									\
-	return __xchg_relaxed(n, &(v->counter), 4);			\
-}									\
-static __always_inline							\
-int arch_atomic_cmpxchg_relaxed(atomic_t *v, int o, int n)		\
-{									\
-	return __cmpxchg_relaxed(&(v->counter), o, n, 4);		\
-}									\
-static __always_inline							\
-int arch_atomic_cmpxchg_acquire(atomic_t *v, int o, int n)		\
-{									\
-	return __cmpxchg_acquire(&(v->counter), o, n, 4);		\
-}									\
-static __always_inline							\
-int arch_atomic_cmpxchg(atomic_t *v, int o, int n)			\
-{									\
-	return __cmpxchg(&(v->counter), o, n, 4);			\
-}
-
-#define ATOMIC_OPS()							\
-	ATOMIC_OP()
-
-ATOMIC_OPS()
-
-#define arch_atomic_xchg_relaxed	arch_atomic_xchg_relaxed
-#define arch_atomic_cmpxchg_relaxed	arch_atomic_cmpxchg_relaxed
-#define arch_atomic_cmpxchg_acquire	arch_atomic_cmpxchg_acquire
-#define arch_atomic_cmpxchg		arch_atomic_cmpxchg
-
-#undef ATOMIC_OPS
-#undef ATOMIC_OP
-
 #else
 #include <asm-generic/atomic.h>
 #endif
diff --git a/arch/csky/include/asm/smp.h b/arch/csky/include/asm/smp.h
index 668b79ce29ea..d3db334f3196 100644
--- a/arch/csky/include/asm/smp.h
+++ b/arch/csky/include/asm/smp.h
@@ -23,7 +23,7 @@ void __init set_send_ipi(void (*func)(const struct cpumask *mask), int irq);
 
 int __cpu_disable(void);
 
-void __cpu_die(unsigned int cpu);
+static inline void __cpu_die(unsigned int cpu) { }
 
 #endif /* CONFIG_SMP */
 
diff --git a/arch/csky/kernel/probes/uprobes.c b/arch/csky/kernel/probes/uprobes.c
index 2d31a12e46cf..936bea6fd32d 100644
--- a/arch/csky/kernel/probes/uprobes.c
+++ b/arch/csky/kernel/probes/uprobes.c
@@ -64,6 +64,7 @@ int arch_uprobe_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
 	struct uprobe_task *utask = current->utask;
 
 	WARN_ON_ONCE(current->thread.trap_no != UPROBE_TRAP_NR);
+	current->thread.trap_no = utask->autask.saved_trap_no;
 
 	instruction_pointer_set(regs, utask->vaddr + auprobe->insn_size);
 
@@ -101,6 +102,8 @@ void arch_uprobe_abort_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
 {
 	struct uprobe_task *utask = current->utask;
 
+	current->thread.trap_no = utask->autask.saved_trap_no;
+
 	/*
 	 * Task has received a fatal signal, so reset back to probed
 	 * address.
diff --git a/arch/csky/kernel/smp.c b/arch/csky/kernel/smp.c
index b12e2c3c387f..8e42352cbf12 100644
--- a/arch/csky/kernel/smp.c
+++ b/arch/csky/kernel/smp.c
@@ -291,12 +291,8 @@ int __cpu_disable(void)
 	return 0;
 }
 
-void __cpu_die(unsigned int cpu)
+void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu)
 {
-	if (!cpu_wait_death(cpu, 5)) {
-		pr_crit("CPU%u: shutdown failed\n", cpu);
-		return;
-	}
 	pr_notice("CPU%u: shutdown\n", cpu);
 }
 
@@ -304,7 +300,7 @@ void __noreturn arch_cpu_idle_dead(void)
 {
 	idle_task_exit();
 
-	cpu_report_death();
+	cpuhp_ap_report_dead();
 
 	while (!secondary_stack)
 		arch_cpu_idle();
diff --git a/arch/csky/mm/fault.c b/arch/csky/mm/fault.c
index e15f736cca4b..a885518ce1dd 100644
--- a/arch/csky/mm/fault.c
+++ b/arch/csky/mm/fault.c
@@ -97,13 +97,12 @@ static inline void mm_fault_error(struct pt_regs *regs, unsigned long addr, vm_f
 	BUG();
 }
 
-static inline void bad_area(struct pt_regs *regs, struct mm_struct *mm, int code, unsigned long addr)
+static inline void bad_area_nosemaphore(struct pt_regs *regs, struct mm_struct *mm, int code, unsigned long addr)
 {
 	/*
 	 * Something tried to access memory that isn't in our memory map.
 	 * Fix it, but check if it's kernel or user first.
 	 */
-	mmap_read_unlock(mm);
 	/* User mode accesses just cause a SIGSEGV */
 	if (user_mode(regs)) {
 		do_trap(regs, SIGSEGV, code, addr);
@@ -238,20 +237,9 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
 	if (is_write(regs))
 		flags |= FAULT_FLAG_WRITE;
 retry:
-	mmap_read_lock(mm);
-	vma = find_vma(mm, addr);
+	vma = lock_mm_and_find_vma(mm, addr, regs);
 	if (unlikely(!vma)) {
-		bad_area(regs, mm, code, addr);
-		return;
-	}
-	if (likely(vma->vm_start <= addr))
-		goto good_area;
-	if (unlikely(!(vma->vm_flags & VM_GROWSDOWN))) {
-		bad_area(regs, mm, code, addr);
-		return;
-	}
-	if (unlikely(expand_stack(vma, addr))) {
-		bad_area(regs, mm, code, addr);
+		bad_area_nosemaphore(regs, mm, code, addr);
 		return;
 	}
 
@@ -259,11 +247,11 @@ retry:
 	 * Ok, we have a good vm_area for this memory access, so
 	 * we can handle it.
 	 */
-good_area:
 	code = SEGV_ACCERR;
 
 	if (unlikely(access_error(regs, vma))) {
-		bad_area(regs, mm, code, addr);
+		mmap_read_unlock(mm);
+		bad_area_nosemaphore(regs, mm, code, addr);
 		return;
 	}