36 files changed, 24 insertions, 140 deletions

diff --git a/arch/Kconfig b/arch/Kconfig
index 81869a5e7e17..0f298f9123dc 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -517,6 +517,11 @@ config HAVE_ARCH_MMAP_RND_BITS
           - ARCH_MMAP_RND_BITS_MIN
           - ARCH_MMAP_RND_BITS_MAX
 
+config HAVE_EXIT_THREAD
+        bool
+        help
+          An architecture implements exit_thread.
+
 config ARCH_MMAP_RND_BITS_MIN
         int
 
diff --git a/arch/alpha/kernel/process.c b/arch/alpha/kernel/process.c
index 84d13263ce46..b483156698d5 100644
--- a/arch/alpha/kernel/process.c
+++ b/arch/alpha/kernel/process.c
@@ -210,14 +210,6 @@ start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp)
 }
 EXPORT_SYMBOL(start_thread);
 
-/*
- * Free current thread data structures etc..
- */
-void
-exit_thread(void)
-{
-}
-
 void
 flush_thread(void)
 {
diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c
index a3f750e76b68..b5db9e7fd649 100644
--- a/arch/arc/kernel/process.c
+++ b/arch/arc/kernel/process.c
@@ -183,13 +183,6 @@ void flush_thread(void)
 {
 }
 
-/*
- * Free any architecture-specific thread data structures, etc.
- */
-void exit_thread(void)
-{
-}
-
 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
 {
         return 0;
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index b99d25b4133e..956d3575426c 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -50,6 +50,7 @@ config ARM
         select HAVE_DMA_CONTIGUOUS if MMU
         select HAVE_DYNAMIC_FTRACE if (!XIP_KERNEL) && !CPU_ENDIAN_BE32 && MMU
         select HAVE_EFFICIENT_UNALIGNED_ACCESS if (CPU_V6 || CPU_V6K || CPU_V7) && MMU
+        select HAVE_EXIT_THREAD
         select HAVE_FTRACE_MCOUNT_RECORD if (!XIP_KERNEL)
         select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
         select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index 48eea6866c67..6cd2612236dc 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -200,13 +200,6 @@ void show_regs(struct pt_regs * regs)
         __show_regs(regs);
 }
 
-/*
- * Free current thread data structures etc..
- */
-void exit_thread(void)
-{
-}
-
 static void tls_thread_flush(void)
 {
         asm ("msr tpidr_el0, xzr");
diff --git a/arch/avr32/Kconfig b/arch/avr32/Kconfig
index 18b88779e701..e43519a2ca89 100644
--- a/arch/avr32/Kconfig
+++ b/arch/avr32/Kconfig
@@ -4,6 +4,7 @@ config AVR32
         # that we usually don't need on AVR32.
         select EXPERT
         select HAVE_CLK
+        select HAVE_EXIT_THREAD
         select HAVE_OPROFILE
         select HAVE_KPROBES
         select VIRT_TO_BUS
diff --git a/arch/blackfin/include/asm/processor.h b/arch/blackfin/include/asm/processor.h
index 7acd46653df3..0c265aba94ad 100644
--- a/arch/blackfin/include/asm/processor.h
+++ b/arch/blackfin/include/asm/processor.h
@@ -76,13 +76,6 @@ static inline void release_thread(struct task_struct *dead_task)
 }
 
 /*
- * Free current thread data structures etc..
- */
-static inline void exit_thread(void)
-{
-}
-
-/*
  * Return saved PC of a blocked thread.
  */
 #define thread_saved_pc(tsk)    (tsk->thread.pc)
diff --git a/arch/c6x/kernel/process.c b/arch/c6x/kernel/process.c
index 3ae9f5a166a0..0ee7686a78f3 100644
--- a/arch/c6x/kernel/process.c
+++ b/arch/c6x/kernel/process.c
@@ -82,10 +82,6 @@ void flush_thread(void)
 {
 }
 
-void exit_thread(void)
-{
-}
-
 /*
  * Do necessary setup to start up a newly executed thread.
  */
diff --git a/arch/cris/Kconfig b/arch/cris/Kconfig
index 99bda1ba3d2f..5c0ca8ae9293 100644
--- a/arch/cris/Kconfig
+++ b/arch/cris/Kconfig
@@ -59,6 +59,7 @@ config CRIS
         select GENERIC_IOMAP
         select MODULES_USE_ELF_RELA
         select CLONE_BACKWARDS2
+        select HAVE_EXIT_THREAD if ETRAX_ARCH_V32
         select OLD_SIGSUSPEND
         select OLD_SIGACTION
         select GPIOLIB
diff --git a/arch/cris/arch-v10/kernel/process.c b/arch/cris/arch-v10/kernel/process.c
index 02b783457be0..96e5afef6b47 100644
--- a/arch/cris/arch-v10/kernel/process.c
+++ b/arch/cris/arch-v10/kernel/process.c
@@ -35,15 +35,6 @@ void default_idle(void)
         local_irq_enable();
 }
 
-/*
- * Free current thread data structures etc..
- */
-
-void exit_thread(void)
-{
-        /* Nothing needs to be done.  */
-}
-
 /* if the watchdog is enabled, we can simply disable interrupts and go
  * into an eternal loop, and the watchdog will reset the CPU after 0.1s
  * if on the other hand the watchdog wasn't enabled, we just enable it and wait
diff --git a/arch/frv/include/asm/processor.h b/arch/frv/include/asm/processor.h
index ae8d423e79d9..73f0a79ad8e6 100644
--- a/arch/frv/include/asm/processor.h
+++ b/arch/frv/include/asm/processor.h
@@ -97,13 +97,6 @@ extern asmlinkage void *restore_user_regs(const struct user_context *target, ...