flagday: don't pass regs to copy_thread()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

34 files changed, 45 insertions, 60 deletions

diff --git a/arch/alpha/kernel/process.c b/arch/alpha/kernel/process.c
index e9705bcc96f9..b5d0d0923699 100644
--- a/arch/alpha/kernel/process.c
+++ b/arch/alpha/kernel/process.c
@@ -241,7 +241,7 @@ release_thread(struct task_struct *dead_task)
 int
 copy_thread(unsigned long clone_flags, unsigned long usp,
             unsigned long arg,
-            struct task_struct *p, struct pt_regs *wontuse)
+            struct task_struct *p)
 {
         extern void ret_from_fork(void);
         extern void ret_from_kernel_thread(void);
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 4ab80bbb6d95..9800338c5d1b 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -376,7 +376,7 @@ asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
 
 int
 copy_thread(unsigned long clone_flags, unsigned long stack_start,
-            unsigned long stk_sz, struct task_struct *p, struct pt_regs *unused)
+            unsigned long stk_sz, struct task_struct *p)
 {
         struct thread_info *thread = task_thread_info(p);
         struct pt_regs *childregs = task_pt_regs(p);
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index 5a1335caf6f1..cb0956bc96ed 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -234,8 +234,7 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
 asmlinkage void ret_from_fork(void) asm("ret_from_fork");
 
 int copy_thread(unsigned long clone_flags, unsigned long stack_start,
-                unsigned long stk_sz, struct task_struct *p,
-                struct pt_regs *unused)
+                unsigned long stk_sz, struct task_struct *p)
 {
         struct pt_regs *childregs = task_pt_regs(p);
         unsigned long tls = p->thread.tp_value;
diff --git a/arch/avr32/kernel/process.c b/arch/avr32/kernel/process.c
index 03d7aa4a4bc9..fd78f58ea79a 100644
--- a/arch/avr32/kernel/process.c
+++ b/arch/avr32/kernel/process.c
@@ -299,7 +299,7 @@ asmlinkage void syscall_return(void);
 
 int copy_thread(unsigned long clone_flags, unsigned long usp,
                 unsigned long arg,
-                struct task_struct *p, struct pt_regs *unused)
+                struct task_struct *p)
 {
         struct pt_regs *childregs = task_pt_regs(p);
 
diff --git a/arch/blackfin/kernel/process.c b/arch/blackfin/kernel/process.c
index e5ae8fcab438..582276efaaa4 100644
--- a/arch/blackfin/kernel/process.c
+++ b/arch/blackfin/kernel/process.c
@@ -141,14 +141,14 @@ asmlinkage int bfin_clone(unsigned long clone_flags, unsigned long newsp)
 int
 copy_thread(unsigned long clone_flags,
             unsigned long usp, unsigned long topstk,
-            struct task_struct *p, struct pt_regs *regs)
+            struct task_struct *p)
 {
         struct pt_regs *childregs;
         unsigned long *v;
 
         childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
         v = ((unsigned long *)childregs) - 2;
-        if (unlikely(!regs)) {
+        if (unlikely(p->flags & PF_KTHREAD)) {
                 memset(childregs, 0, sizeof(struct pt_regs));
                 v[0] = usp;
                 v[1] = topstk;
@@ -157,7 +157,7 @@ copy_thread(unsigned long clone_flags,
                 __asm__ __volatile__("%0 = syscfg;":"=da"(childregs->syscfg):);
                 p->thread.usp = 0;
         } else {
-                *childregs = *regs;
+                *childregs = *current_pt_regs();
                 childregs->r0 = 0;
                 p->thread.usp = usp ? : rdusp();
                 v[0] = v[1] = 0;
diff --git a/arch/c6x/kernel/process.c b/arch/c6x/kernel/process.c
index a3f91895e8b4..6434df476f77 100644
--- a/arch/c6x/kernel/process.c
+++ b/arch/c6x/kernel/process.c
@@ -139,7 +139,7 @@ void start_thread(struct pt_regs *regs, unsigned int pc, unsigned long usp)
  */
 int copy_thread(unsigned long clone_flags, unsigned long usp,
                 unsigned long ustk_size,
-                struct task_struct *p, struct pt_regs *unused)
+                struct task_struct *p)
 {
         struct pt_regs *childregs;
 
diff --git a/arch/cris/arch-v10/kernel/process.c b/arch/cris/arch-v10/kernel/process.c
index 520547c8b196..b1018750cffb 100644
--- a/arch/cris/arch-v10/kernel/process.c
+++ b/arch/cris/arch-v10/kernel/process.c
@@ -94,8 +94,7 @@ asmlinkage void ret_from_fork(void);
 asmlinkage void ret_from_kernel_thread(void);
 
 int copy_thread(unsigned long clone_flags, unsigned long usp,
-                unsigned long arg,
-                struct task_struct *p, struct pt_regs *unused)
+                unsigned long arg, struct task_struct *p)
 {
         struct pt_regs *childregs = task_pt_regs(p);
         struct switch_stack *swstack = ((struct switch_stack *)childregs) - 1;
diff --git a/arch/cris/arch-v32/kernel/process.c b/arch/cris/arch-v32/kernel/process.c
index 331e70252df0..2b23ef0e4452 100644
--- a/arch/cris/arch-v32/kernel/process.c
+++ b/arch/cris/arch-v32/kernel/process.c
@@ -109,8 +109,7 @@ extern asmlinkage void ret_from_kernel_thread(void);
 
 int
 copy_thread(unsigned long clone_flags, unsigned long usp,
-        unsigned long arg,
-        struct task_struct *p, struct pt_regs *unused)
+        unsigned long arg, struct task_struct *p)
 {
         struct pt_regs *childregs = task_pt_regs(p);
         struct switch_stack *swstack = ((struct switch_stack *) childregs) - 1;
diff --git a/arch/frv/kernel/process.c b/arch/frv/kernel/process.c
index 0039bf77b192..23916b2a12a2 100644
--- a/arch/frv/kernel/process.c
+++ b/arch/frv/kernel/process.c
@@ -144,7 +144,7 @@ inline unsigned long user_stack(const struct pt_regs *regs)
  */
 int copy_thread(unsigned long clone_flags,
                 unsigned long usp, unsigned long arg,
-                struct task_struct *p, struct pt_regs *unused)
+                struct task_struct *p)
 {
         struct pt_regs *childregs;
 
diff --git a/arch/h8300/kernel/process.c b/arch/h8300/kernel/process.c
index b0fb4054aee5..b609f63f1590 100644
--- a/arch/h8300/kernel/process.c
+++ b/arch/h8300/kernel/process.c
@@ -129,7 +129,7 @@ void flush_thread(void)
 
 int copy_thread(unsigned long clone_flags,
                 unsigned long usp, unsigned long topstk,
-                 struct task_struct * p, struct pt_regs *unused)
+                 struct task_struct * p)
 {
         struct pt_regs * childregs;
 
diff --git a/arch/hexagon/kernel/process.c b/arch/hexagon/kernel/process.c
index 36dce17ed25c..06ae9ffcabd5 100644
--- a/arch/hexagon/kernel/process.c
+++ b/arch/hexagon/kernel/process.c
@@ -87,8 +87,7 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
  * Copy architecture-specific thread state
  */
 int copy_thread(unsigned long clone_flags, unsigned long usp,
-                unsigned long arg, struct task_struct *p,
-                struct pt_regs *unused)
+                unsigned long arg, struct task_struct *p)
 {
         struct thread_info *ti = task_thread_info(p);
         struct hexagon_switch_stack *ss;
diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
index 25543a295ad9..31360cbbd5f8 100644
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -393,12 +393,13 @@ ia64_load_extra (struct task_struct *task)
 int
 copy_thread(unsigned long clone_flags,
              unsigned long user_stack_base, unsigned long user_stack_size,
-             struct task_struct *p, struct pt_regs *regs)
+             struct task_struct *p)
 {
         extern char ia64_ret_from_clone;
         struct switch_stack *child_stack, *stack;
         unsigned long rbs, child_rbs, rbs_size;
         struct pt_regs *child_ptregs;
+        struct pt_regs *regs = current_pt_regs();
         int retval = 0;
 
         child_ptregs = (struct pt_regs *) ((unsigned long) p + IA64_STK_OFFSET) - 1;
diff --git a/arch/m32r/kernel/process.c b/arch/m32r/kernel/process.c
index c37e9a9a8f27..765d0f57c787 100644
--- a/arch/m32r/kernel/process.c
+++ b/arch/m32r/kernel/process.c
@@ -192,7 +192,7 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
 }
 
 int copy_thread(unsigned long clone_flags, unsigned long spu,
-        unsigned long arg, struct task_struct *tsk, struct pt_regs *unused)
+        unsigned long arg, struct task_struct *tsk)
 {
         struct pt_regs *childregs = task_pt_regs(tsk);
         extern void ret_from_fork(void);
diff --git a/arch/m68k/kernel/process.c b/arch/m68k/kernel/process.c
index aa9b11000273..9a3df4df73cc 100644
--- a/arch/m68k/kernel/process.c
+++ b/arch/m68k/kernel/process.c
@@ -154,8 +154,7 @@ asmlinkage int m68k_clone(struct pt_regs *regs)
 }
 
 int copy_thread(unsigned long clone_flags, unsigned long usp,
-                 unsigned long arg,
-                 struct task_struct * p, struct pt_regs * unused)
+                 unsigned long arg, struct task_struct *p)
 {
         struct fork_frame {
                 struct switch_stack sw;
diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c
index a5fed8db7263..40823fd1db0b 100644
--- a/arch/microblaze/kernel/process.c
+++ b/arch/microblaze/kernel/process.c
@@ -120,8 +120,7 @@ void flush_thread(void)
 }
 
 int copy_thread(unsigned long clone_flags, unsigned long usp,
-                unsigned long arg,
-                struct task_struct *p, struct pt_regs *unused)
+                unsigned long arg, struct task_struct *p)
 {
         struct pt_regs *childregs = task_pt_regs(p);
         struct thread_info *ti = task_thread_info(p);
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index d13720ac656f..38097652d62d 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -114,10 +114,10 @@ void flush_thread(void)
 }
 
 int copy_thread(unsigned long clone_flags, unsigned long usp,
-        unsigned long arg, struct task_struct *p, struct pt_regs *regs)
+        unsigned long arg, struct task_struct *p)
 {
         struct thread_info *ti = task_thread_info(p);
-        struct pt_regs *childregs;
+        struct pt_regs *childregs, *regs = current_pt_regs();
         unsigned long childksp;
         p->set_child_tid = p->clear_child_tid = NULL;
 
diff --git a/arch/mn10300/kernel/process.c b/arch/mn10300/kernel/process.c
index 5e0ef396458d..eb09f5a552ff 100644
--- a/arch/mn10300/kernel/process.c
+++ b/arch/mn10300/kernel/process.c
@@ -206,7 +206,7 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
  */
 int copy_thread(unsigned long clone_flags,
                 unsigned long c_usp, unsigned long ustk_size,
-                struct task_struct *p, struct pt_regs *unused)
+                struct task_struct *p)
 {
         struct thread_info *ti = task_thread_info(p);
         struct pt_regs *c_regs;
diff --git a/arch/openrisc/kernel/process.c b/arch/openrisc/kernel/process.c
index 6b853668369b..00c233bf0d06 100644
--- a/arch/openrisc/kernel/process.c
+++ b/arch/openrisc/kernel/process.c
@@ -142,7 +142,7 @@ extern asmlinkage void ret_from_fork(void);
 
 int
 copy_thread(unsigned long clone_flags, unsigned long usp,
-            unsigned long arg, struct task_struct *p, struct pt_regs *regs)
+            unsigned long arg, struct task_struct *p)
 {
         struct pt_regs *userregs;
         struct pt_regs *kregs;
diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c
index 9753ecf49a06..d13507246c5d 100644
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -204,10 +204,9 @@ int dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *r)
 
 int
 copy_thread(unsigned long clone_flags, unsigned long usp,
-            unsigned long arg,
-            struct task_struct *p, struct pt_regs *unused)
+            unsigned long arg, struct task_struct *p)
 {
-        struct pt_regs * cregs = &(p->thread.regs);
+        struct pt_regs *cregs = &(p->thread.regs);
         void *stack = task_stack_page(p);
         
         /* We have to use void * instead of a function pointer, because
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index a31437567631..81430674e71c 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -733,8 +733,7 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
 extern unsigned long dscr_default; /* defined in arch/powerpc/kernel/sysfs.c */
 
 int copy_thread(unsigned long clone_flags, unsigned long usp,
-                unsigned long arg, struct task_struct *p,
-                struct pt_regs *regs)
+                unsigned long arg, struct task_struct *p)
 {
         struct pt_regs *childregs, *kregs;
         extern void ret_from_fork(void);
@@ -759,6 +758,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
                 ti->flags |= _TIF_RESTOREALL;
                 f = ret_from_kernel_thread;
         } else {
+                struct pt_regs *regs = current_pt_regs();
                 CHECK_FULL_REGS(regs);
                 *childregs = *regs;
                 if (usp)
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index e37677796a09..536d64579d9a 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -117,8 +117,7 @@ void release_thread(struct task_struct *dead_task)
 }
 
 int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
-                unsigned long arg,
-                struct task_struct *p, struct pt_regs *unused)
+                unsigned long arg, struct task_struct *p)
 {
         struct thread_info *ti;
         struct fake_frame
diff --git a/arch/score/kernel/process.c b/arch/score/kernel/process.c
index f96379a5aee0..79568466b578 100644
--- a/arch/score/kernel/process.c
+++ b/arch/score/kernel/process.c
@@ -87,11 +87,11 @@ void flush_thread(void) {}
  * set up the kernel stack and exception frames for a new process
  */
 int copy_thread(unsigned long clone_flags, unsigned long usp,
-                unsigned long arg,
-                struct task_struct *p, struct pt_regs *regs)
+                unsigned long arg, struct task_struct *p)
 {
         struct thread_info *ti = task_thread_info(p);
         struct pt_regs *childregs = task_pt_regs(p);
+        struct pt_regs *regs = current_pt_regs();
 
         p->thread.reg0 = (unsigned long) childregs;
         if (unlikely(p->flags & PF_KTHREAD)) {
diff --git a/arch/sh/kernel/process_32.c b/arch/sh/kernel/process_32.c
index 1786d16b6c64..73eb66fc6253 100644
--- a/arch/sh/kernel/process_32.c
+++ b/arch/sh/kernel/process_32.c
@@ -128,8 +128,7 @@ asmlinkage void ret_from_fork(void);
 asmlinkage void ret_from_kernel_thread(void);
 
 int copy_thread(unsigned long clone_flags, unsigned long usp,
-                unsigned long arg,
-                struct task_struct *p, struct pt_regs *unused)
+                unsigned long arg, struct task_struct *p)
 {
         struct thread_info *ti = task_thread_info(p);
         struct pt_regs *childregs;
diff --git a/arch/sh/kernel/process_64.c b/arch/sh/kernel/process_64.c
index d5c86a8a3849..e611c85144b1 100644
--- a/arch/sh/kernel/process_64.c
+++ b/arch/sh/kernel/process_64.c
@@ -371,10 +371,9 @@ asmlinkage void ret_from_fork(void);
 asmlinkage void ret_from_kernel_thread(void);
 
 int copy_thread(unsigned long clone_flags, unsigned long usp,
-                unsigned long arg,
-                struct task_struct *p, struct pt_regs *regs)
+                unsigned long arg, struct task_struct *p)
 {
-        struct pt_regs *childregs;
+        struct pt_regs *childregs, *regs = current_pt_regs();
 
 #ifdef CONFIG_SH_FPU
         /* can't happen for a kernel thread */
diff --git a/arch/sparc/kernel/process_32.c b/arch/sparc/kernel/process_32.c
index bf4c6addce7b..ecde946ef834 100644
--- a/arch/sparc/kernel/process_32.c
+++ b/arch/sparc/kernel/process_32.c
@@ -319,11 +319,10 @@ extern void ret_from_fork(void);
 extern void ret_from_kernel_thread(void);
 
 int copy_thread(unsigned long clone_flags, unsigned long sp,
-                unsigned long arg,
-                struct task_struct *p, struct pt_regs *regs)
+                unsigned long arg, struct task_struct *p)
 {
         struct thread_info *ti = task_thread_info(p);
-        struct pt_regs *childregs;
+        struct pt_regs *childregs, *regs = current_pt_regs();
         char *new_stack;
 
 #ifndef CONFIG_SMP
diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c
index dff54f46728d..58ef19e7e82f 100644
--- a/arch/sparc/kernel/process_64.c
+++ b/arch/sparc/kernel/process_64.c
@@ -622,10 +622,10 @@ asmlinkage long sparc_do_fork(unsigned long clone_flags,
  * Child  -->  %o0 == parents pid, %o1 == 1
  */
 int copy_thread(unsigned long clone_flags, unsigned long sp,
-                unsigned long arg,
-                struct task_struct *p, struct pt_regs *regs)
+                unsigned long arg, struct task_struct *p)
 {
         struct thread_info *t = task_thread_info(p);
+        struct pt_regs *regs = current_pt_regs();
         struct sparc_stackf *parent_sf;
         unsigned long child_stack_sz;
         char *child_trap_frame;
diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c
index 267936b51b59..0e5661e7d00d 100644
--- a/arch/tile/kernel/process.c
+++ b/arch/tile/kernel/process.c
@@ -157,10 +157,9 @@ void arch_release_thread_info(struct thread_info *info)
 static void save_arch_state(struct thread_struct *t);
 
 int copy_thread(unsigned long clone_flags, unsigned long sp,
-                unsigned long arg,
-                struct task_struct *p, struct pt_regs *unused)
+                unsigned long arg, struct task_struct *p)
 {
-        struct pt_regs *childregs = task_pt_regs(p);
+        struct pt_regs *childregs = task_pt_regs(p), *regs = current_pt_regs();
         unsigned long ksp;
         unsigned long *callee_regs;
 
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index c502c804e8bb..b462b13c5bae 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -161,8 +161,7 @@ void fork_handler(void)
 }
 
 int copy_thread(unsigned long clone_flags, unsigned long sp,
-                unsigned long arg, struct task_struct * p,
-                struct pt_regs *regs)
+                unsigned long arg, struct task_struct * p)
 {
         void (*handler)(void);
         int kthread = current->flags & PF_KTHREAD;
diff --git a/arch/unicore32/kernel/process.c b/arch/unicore32/kernel/process.c
index 79e44e8ae31c..62bad9fed03e 100644
--- a/arch/unicore32/kernel/process.c
+++ b/arch/unicore32/kernel/process.c
@@ -262,7 +262,7 @@ asmlinkage void ret_from_kernel_thread(void) __asm__("ret_from_kernel_thread");
 
 int
 copy_thread(unsigned long clone_flags, unsigned long stack_start,
-            unsigned long stk_sz, struct task_struct *p, struct pt_regs *unused)
+            unsigned long stk_sz, struct task_struct *p)
 {
         struct thread_info *thread = task_thread_info(p);
         struct pt_regs *childregs = task_pt_regs(p);
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 16efa974532b..b5a8905785e6 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -128,8 +128,7 @@ void release_thread(struct task_struct *dead_task)
 }
 
 int copy_thread(unsigned long clone_flags, unsigned long sp,
-        unsigned long arg,
-        struct task_struct *p, struct pt_regs *unused)
+        unsigned long arg, struct task_struct *p)
 {
         struct pt_regs *childregs = task_pt_regs(p);
         struct task_struct *tsk;
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 74aac76c6e34..6e68a6194965 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -146,8 +146,7 @@ static inline u32 read_32bit_tls(struct task_struct *t, int tls)
 }
 
 int copy_thread(unsigned long clone_flags, unsigned long sp,
-                unsigned long arg,
-        struct task_struct *p, struct pt_regs *regs)
+                unsigned long arg, struct task_struct *p)
 {
         int err;
         struct pt_regs *childregs;
diff --git a/arch/xtensa/kernel/process.c b/arch/xtensa/kernel/process.c
index 0036c14739f8..1accf28da5f5 100644
--- a/arch/xtensa/kernel/process.c
+++ b/arch/xtensa/kernel/process.c
@@ -199,8 +199,7 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
  */
 
 int copy_thread(unsigned long clone_flags, unsigned long usp_thread_fn,
-                unsigned long thread_fn_arg,
-                struct task_struct *p, struct pt_regs *unused)
+                unsigned long thread_fn_arg, struct task_struct *p)
 {
         struct pt_regs *childregs = task_pt_regs(p);
 
diff --git a/include/linux/sched.h b/include/linux/sched.h
index c57249782e48..78a2ae3470df 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2271,7 +2271,7 @@ extern void mm_release(struct task_struct *, struct mm_struct *);
 extern struct mm_struct *dup_mm(struct task_struct *tsk);
 
 extern int copy_thread(unsigned long, unsigned long, unsigned long,
-                        struct task_struct *, struct pt_regs *);
+                        struct task_struct *);
 extern void flush_thread(void);
 extern void exit_thread(void);
 
diff --git a/kernel/fork.c b/kernel/fork.c
index 27a337549dab..d96a562b1311 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1320,7 +1320,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         retval = copy_io(clone_flags, p);
         if (retval)
                 goto bad_fork_cleanup_namespaces;
-        retval = copy_thread(clone_flags, stack_start, stack_size, p, regs);
+        retval = copy_thread(clone_flags, stack_start, stack_size, p);
         if (retval)
                 goto bad_fork_cleanup_io;