diff --git a/arch/Kconfig b/arch/Kconfig
index 81869a5e7e174ae470ba7746d88f8cdb35065c36..0f298f9123dc5f9d4454036a0edbc18c9519efcb 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 84d13263ce46f193ef0b223466cea2f522ca109d..b483156698d5043358ecc9a681fc77f197282d25 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 a3f750e76b683dd25a45584b71014532214b20ac..b5db9e7fd649204d1e0da5d772274544b8483c2a 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 b99d25b4133e38bcd9513aa76a879b1e3565accf..956d3575426cc45f38b7ad07c2d426025415af9c 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 48eea6866c677e0746dc786dde96bb7779583ea4..6cd2612236dcf9d1b1f56abd2b90ca2581fd94a5 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 18b88779e701ed77088edcc0865bd25c6f060791..e43519a2ca89b47b007e4935b03142a76800bf6b 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 7acd46653df3680d5208020945365063c57891af..0c265aba94add376d8546e716703e0e653d1c6b1 100644
--- a/arch/blackfin/include/asm/processor.h
+++ b/arch/blackfin/include/asm/processor.h
@@ -75,13 +75,6 @@ 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.
*/
diff --git a/arch/c6x/kernel/process.c b/arch/c6x/kernel/process.c
index 3ae9f5a166a0584034dea8fb41ea645ccf88aeea..0ee7686a78f375af8b4f525643e4fea298b8998c 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 99bda1ba3d2f374c15f6c1edd11760d64a075f42..5c0ca8ae929315b8c7acbcae5976a0f6bfde937c 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 02b783457be0a92a0e346f21675f0f06b59b4288..96e5afef6b47b8831a56eb60c19a026a9c0bc2de 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 ae8d423e79d9dbe5c9c33d6ce1a15c3c51140f56..73f0a79ad8e691d6106e636a33bb006a688bd97c 100644
--- a/arch/frv/include/asm/processor.h
+++ b/arch/frv/include/asm/processor.h
@@ -96,13 +96,6 @@ extern asmlinkage void *restore_user_regs(const struct user_context *target, ...
#define release_segments(mm) do { } while (0)
#define forget_segments() do { } while (0)
-/*
- * Free current thread data structures etc..
- */
-static inline void exit_thread(void)
-{
-}
-
/*
* Return saved PC of a blocked thread.
*/
diff --git a/arch/h8300/include/asm/processor.h b/arch/h8300/include/asm/processor.h
index 54e3fd83c3360d3821fd5a9bd8eea1868afe9d96..111df7397ac7bd4ee0aa979bb3b0c5f7438722b4 100644
--- a/arch/h8300/include/asm/processor.h
+++ b/arch/h8300/include/asm/processor.h
@@ -110,13 +110,6 @@ 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.
*/
diff --git a/arch/hexagon/kernel/process.c b/arch/hexagon/kernel/process.c
index a9ebd471823a6644a6773ed99d780c5c620f3e56..d9edfd3fc52af94ec05653d9d951649a627ce1b7 100644
--- a/arch/hexagon/kernel/process.c
+++ b/arch/hexagon/kernel/process.c
@@ -136,13 +136,6 @@ void release_thread(struct task_struct *dead_task)
{
}
-/*
- * Free any architecture-specific thread data structures, etc.
- */
-void exit_thread(void)
-{
-}
-
/*
* Some archs flush debug and FPU info here
*/
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index b534ebab36eac7397ca29119e1545fc9bbf7b611..f80758cb7157df174e930d58306be808e97b248a 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -18,6 +18,7 @@ config IA64
select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI
select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
select HAVE_UNSTABLE_SCHED_CLOCK
+ select HAVE_EXIT_THREAD
select HAVE_IDE
select HAVE_OPROFILE
select HAVE_KPROBES
diff --git a/arch/m32r/kernel/process.c b/arch/m32r/kernel/process.c
index e69221d581d54d6fbe8283cc1eddb4c31a39399e..a88b1f01e91f380c45bce48fd6fa697487727a9f 100644
--- a/arch/m32r/kernel/process.c
+++ b/arch/m32r/kernel/process.c
@@ -101,15 +101,6 @@ void show_regs(struct pt_regs * regs)
#endif
}
-/*
- * Free current thread data structures etc..
- */
-void exit_thread(void)
-{
- /* Nothing to do. */
- DPRINTK("pid = %d\n", current->pid);
-}
-
void flush_thread(void)
{
DPRINTK("pid = %d\n", current->pid);
diff --git a/arch/m68k/include/asm/processor.h b/arch/m68k/include/asm/processor.h
index 20dda1d4b86014975a68b1abde20177fa104482b..a6ce2ec8d693f1643c93fefc70d9934954b6a716 100644
--- a/arch/m68k/include/asm/processor.h
+++ b/arch/m68k/include/asm/processor.h
@@ -153,13 +153,6 @@ static inline void release_thread(struct task_struct *dead_task)
{
}
-/*
- * Free current thread data structures etc..
- */
-static inline void exit_thread(void)
-{
-}
-
extern unsigned long thread_saved_pc(struct task_struct *tsk);
unsigned long get_wchan(struct task_struct *p);
diff --git a/arch/metag/Kconfig b/arch/metag/Kconfig
index a0fa88da3e31a4c8806309154333bb39a2bd6e94..e47a08d72819651446cf937ce54333792666cf58 100644
--- a/arch/metag/Kconfig
+++ b/arch/metag/Kconfig
@@ -11,6 +11,7 @@ config METAG
select HAVE_DEBUG_KMEMLEAK
select HAVE_DEBUG_STACKOVERFLOW
select HAVE_DYNAMIC_FTRACE
+ select HAVE_EXIT_THREAD
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_FUNCTION_TRACER
select HAVE_KERNEL_BZIP2
diff --git a/arch/metag/include/asm/processor.h b/arch/metag/include/asm/processor.h
index 0838ca69976466bbfc3c3854fecf91566afd6a9b..a0333ebcac35212845db8afc7ce837a7e016075b 100644
--- a/arch/metag/include/asm/processor.h
+++ b/arch/metag/include/asm/processor.h
@@ -134,8 +134,6 @@ static inline void release_thread(struct task_struct *dead_task)
#define copy_segments(tsk, mm) do { } while (0)
#define release_segments(mm) do { } while (0)
-extern void exit_thread(void);
-
/*
* Return saved PC of a blocked thread.
*/
diff --git a/arch/microblaze/include/asm/processor.h b/arch/microblaze/include/asm/processor.h
index 497a988d79c2346126de754c5f1fe246d50a7a4c..c38d0dd91134c4049d695931ccee3f4cb4dfd11c 100644
--- a/arch/microblaze/include/asm/processor.h
+++ b/arch/microblaze/include/asm/processor.h
@@ -70,11 +70,6 @@ static inline void release_thread(struct task_struct *dead_task)
{
}
-/* Free all resources held by a thread. */
-static inline void exit_thread(void)
-{
-}
-
extern unsigned long thread_saved_pc(struct task_struct *t);
extern unsigned long get_wchan(struct task_struct *p);
@@ -127,11 +122,6 @@ static inline void release_thread(struct task_struct *dead_task)
{
}
-/* Free current thread data structures etc. */
-static inline void exit_thread(void)
-{
-}
-
/* Return saved (kernel) PC of a blocked thread. */
# define thread_saved_pc(tsk) \
((tsk)->thread.regs ? (tsk)->thread.regs->r15 : 0)
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index a6b3dc54260a51cd06e28777f770f1c3cfd74911..411c971e3417ca2a578e26202cb1ad914cced900 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -73,10 +73,6 @@ void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp)
regs->regs[29] = sp;
}
-void exit_thread(void)
-{
-}
-
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
{
/*
diff --git a/arch/mn10300/Kconfig b/arch/mn10300/Kconfig
index 06ddb5501ab1365ea6a52850cb9e203a9b5b2923..9627e81a6cbb0c4ad22000fc86922be19f44a265 100644
--- a/arch/mn10300/Kconfig
+++ b/arch/mn10300/Kconfig
@@ -1,5 +1,6 @@
config MN10300
def_bool y
+ select HAVE_EXIT_THREAD
select HAVE_OPROFILE
select HAVE_UID16
select GENERIC_IRQ_SHOW
diff --git a/arch/nios2/include/asm/processor.h b/arch/nios2/include/asm/processor.h
index c2ba45c159c73d144672dfb116811447ced86c26..1c953f0cadbf33ad4b7d0d994427afbfb4d0f358 100644
--- a/arch/nios2/include/asm/processor.h
+++ b/arch/nios2/include/asm/processor.h
@@ -75,11 +75,6 @@ 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.kregs->ea)
diff --git a/arch/openrisc/include/asm/processor.h b/arch/openrisc/include/asm/processor.h
index 4d235e3d253458f2d202d253a7667f1958e8612d..70334c9f7d24ce83a0e81d34f6737351f6f29e90 100644
--- a/arch/openrisc/include/asm/processor.h
+++ b/arch/openrisc/include/asm/processor.h
@@ -84,15 +84,6 @@ void start_thread(struct pt_regs *regs, unsigned long nip, unsigned long sp);
void release_thread(struct task_struct *);
unsigned long get_wchan(struct task_struct *p);
-/*
- * Free current thread data structures etc..
- */
-
-extern inline void exit_thread(void)
-{
- /* Nothing needs to be done. */
-}
-
/*
* Return saved PC of a blocked thread. For now, this is the "user" PC
*/
diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c
index 809905a811ed72a543ad257c1394900a4b976af8..40639439d8b35c7cec7c60d978ae6aa5b070b22f 100644
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -144,13 +144,6 @@ void machine_power_off(void)
void (*pm_power_off)(void) = machine_power_off;
EXPORT_SYMBOL(pm_power_off);
-/*
- * Free current thread data structures etc..
- */
-void exit_thread(void)
-{
-}
-
void flush_thread(void)
{
/* Only needs to handle fpu stuff or perf monitors.
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index ea8a28fd6f31e544b3ab15e7b695f5ad42a2fe2e..e2f12cbcade9a49287c370204bcc71a4fb23b33a 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1329,10 +1329,6 @@ void show_regs(struct pt_regs * regs)
show_instructions(regs);
}
-void exit_thread(void)
-{
-}
-
void flush_thread(void)
{
#ifdef CONFIG_HAVE_HW_BREAKPOINT
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index de0fcc08dff546df927082226561629a8e56be82..e2c9aaaf64b22edca386b83519ed12c7a5a8e121 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -134,6 +134,7 @@ config S390
select HAVE_DMA_API_DEBUG
select HAVE_DYNAMIC_FTRACE
select HAVE_DYNAMIC_FTRACE_WITH_REGS
+ select HAVE_EXIT_THREAD
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FUNCTION_TRACER
diff --git a/arch/score/kernel/process.c b/arch/score/kernel/process.c
index a1519ad3d49d68e0e3202ecadb5b6e1b027a7df3..aae9480706c2c8b18380ffe8d7fe52cac8195b0f 100644
--- a/arch/score/kernel/process.c
+++ b/arch/score/kernel/process.c
@@ -56,8 +56,6 @@ void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp)
regs->regs[0] = sp;
}
-void exit_thread(void) {}
-
/*
* When a process does an "exec", machine state like FPU and debug
* registers need to be reset. This is a hook function for that.
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 7ed20fc3fc81b1eee367e81cae239d89deeecf97..cb93af8f80171ff29bcc07116859b70e096b638a 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -71,6 +71,7 @@ config SUPERH32
config SUPERH64
def_bool ARCH = "sh64"
+ select HAVE_EXIT_THREAD
select KALLSYMS
config ARCH_DEFCONFIG
diff --git a/arch/sh/kernel/process_32.c b/arch/sh/kernel/process_32.c
index 2885fc9d9dcdc9b9deec12c9a8a0ac681b366f1f..ee12e94518740829165d7fbcb597fbad90664c5f 100644
--- a/arch/sh/kernel/process_32.c
+++ b/arch/sh/kernel/process_32.c
@@ -76,13 +76,6 @@ void start_thread(struct pt_regs *regs, unsigned long new_pc,
}
EXPORT_SYMBOL(start_thread);
-/*
- * Free current thread data structures etc..
- */
-void exit_thread(void)
-{
-}
-
void flush_thread(void)
{
struct task_struct *tsk = current;
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index db0a26cffa97a77a6ddeae359ce033e26493709b..27b3a0ad40a0c8b1b75c449f322669fdebc37955 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -20,6 +20,7 @@ config SPARC
select HAVE_OPROFILE
select HAVE_ARCH_KGDB if !SMP || SPARC64
select HAVE_ARCH_TRACEHOOK
+ select HAVE_EXIT_THREAD
select SYSCTL_EXCEPTION_TRACE
select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select RTC_CLASS
diff --git a/arch/tile/Kconfig b/arch/tile/Kconfig
index 81719302b056e095dda4c5cfd15e8a5efa18a70f..174746225577aabc1131e7b8ffc9b2bd674e975c 100644
--- a/arch/tile/Kconfig
+++ b/arch/tile/Kconfig
@@ -3,6 +3,7 @@
config TILE
def_bool y
+ select HAVE_EXIT_THREAD
select HAVE_PERF_EVENTS
select USE_PMC if PERF_EVENTS
select HAVE_DMA_API_DEBUG
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index 48af59aae129d088cd6c074d39e167cbf871417a..0b04711f1f18acb9da644aaed59bdd2aafb26e4f 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -103,10 +103,6 @@ void interrupt_end(void)
tracehook_notify_resume(regs);
}
-void exit_thread(void)
-{
-}
-
int get_current_pid(void)
{
return task_pid_nr(current);
diff --git a/arch/unicore32/kernel/process.c b/arch/unicore32/kernel/process.c
index b008e99614658cfb100dd3be24767e4a60f86a80..00299c927852ea72cc743e97bff6e2f3273c9bf8 100644
--- a/arch/unicore32/kernel/process.c
+++ b/arch/unicore32/kernel/process.c
@@ -201,13 +201,6 @@ void show_regs(struct pt_regs *regs)
__backtrace();
}
-/*
- * Free current thread data structures etc..
- */
-void exit_thread(void)
-{
-}
-
void flush_thread(void)
{
struct thread_info *thread = current_thread_info();
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index ace79d2da2c3af158d3f930025637c576fd95a53..8ff5b3be95d46f0799bcefc9d75e2f99360c4e3a 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -105,6 +105,7 @@ config X86
select HAVE_DYNAMIC_FTRACE
select HAVE_DYNAMIC_FTRACE_WITH_REGS
select HAVE_EFFICIENT_UNALIGNED_ACCESS
+ select HAVE_EXIT_THREAD
select HAVE_FENTRY if X86_64
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_FUNCTION_GRAPH_FP_TEST
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 85257afe71c373d45b7408a5c1d4c0e4ac4f3ee7..64336f666fb61ac0cd97b1e7afc92dda343d65fe 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -14,6 +14,7 @@ config XTENSA
select GENERIC_PCI_IOMAP
select GENERIC_SCHED_CLOCK
select HAVE_DMA_API_DEBUG
+ select HAVE_EXIT_THREAD
select HAVE_FUNCTION_TRACER
select HAVE_FUTEX_CMPXCHG if !MMU
select HAVE_HW_BREAKPOINT if PERF_EVENTS
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 6b3213d96da63a96fc0dd1b76ad0ee146d868660..167c0d4bf3fa89d6ef683b9f9fb8a44b53a8b79e 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2769,7 +2769,14 @@ static inline int copy_thread_tls(
}
#endif
extern void flush_thread(void);
+
+#ifdef CONFIG_HAVE_EXIT_THREAD
extern void exit_thread(void);
+#else
+static inline void exit_thread(void)
+{
+}
+#endif
extern void exit_files(struct task_struct *);
extern void __cleanup_sighand(struct sighand_struct *);