uml: tidy process.c

Clean up arch/um/kernel/process.c:

- lots of return(x); -> return x; conversions

- a number of the small functions are either unused, in which case they are
  gone, along any declarations in a header, or could be made static.

- current_pid is ifdefed on CONFIG_MODE_TT and its declaration is ifdefed on
  both CONFIG_MODE_TT and UML_CONFIG_MODE_TT because we don't know whether
  it's being used in a userspace or kernel file.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 38 insertions, 90 deletions

diff --git a/arch/um/include/kern_util.h b/arch/um/include/kern_util.h
index be850b9ec947..09810bc48e5b 100644
--- a/arch/um/include/kern_util.h
+++ b/arch/um/include/kern_util.h
@@ -8,6 +8,7 @@
 
 #include "sysdep/ptrace.h"
 #include "sysdep/faultinfo.h"
+#include "uml-config.h"
 
 typedef void (*kern_hndl)(int, union uml_pt_regs *);
 
@@ -33,7 +34,9 @@ extern int nsyscalls;
         UML_ROUND_DOWN(((unsigned long) addr) + PAGE_SIZE - 1)
 
 extern int kernel_fork(unsigned long flags, int (*fn)(void *), void * arg);
+#ifdef UML_CONFIG_MODE_TT
 extern unsigned long stack_sp(unsigned long page);
+#endif
 extern int kernel_thread_proc(void *data);
 extern void syscall_segv(int sig);
 extern int current_pid(void);
@@ -57,7 +60,6 @@ extern void add_input_request(int op, void (*proc)(int), void *arg);
 extern char *current_cmd(void);
 extern void timer_handler(int sig, union uml_pt_regs *regs);
 extern int set_signals(int enable);
-extern void force_sigbus(void);
 extern int pid_to_processor_id(int pid);
 extern void deliver_signals(void *t);
 extern int next_trap_index(int max);
@@ -69,7 +71,6 @@ extern void *syscall_sp(void *t);
 extern void syscall_trace(union uml_pt_regs *regs, int entryexit);
 extern int hz(void);
 extern unsigned int do_IRQ(int irq, union uml_pt_regs *regs);
-extern int external_pid(void *t);
 extern void interrupt_end(void);
 extern void initial_thread_cb(void (*proc)(void *), void *arg);
 extern int debugger_signal(int status, int pid);
@@ -80,7 +81,6 @@ extern int init_parent_proxy(int pid);
 extern int singlestepping(void *t);
 extern void check_stack_overflow(void *ptr);
 extern void relay_signal(int sig, union uml_pt_regs *regs);
-extern void not_implemented(void);
 extern int user_context(unsigned long sp);
 extern void timer_irq(union uml_pt_regs *regs);
 extern void unprotect_stack(unsigned long stack);
@@ -92,7 +92,6 @@ extern char *uml_strdup(char *string);
 extern void unprotect_kernel_mem(void);
 extern void protect_kernel_mem(void);
 extern void uml_cleanup(void);
-extern void set_current(void *t);
 extern void lock_signalled_task(void *t);
 extern void IPI_handler(int cpu);
 extern int jail_setup(char *line, int *add);
diff --git a/arch/um/include/tt/uaccess-tt.h b/arch/um/include/tt/uaccess-tt.h
index b19645f32f24..13a64f61fcf4 100644
--- a/arch/um/include/tt/uaccess-tt.h
+++ b/arch/um/include/tt/uaccess-tt.h
@@ -27,8 +27,6 @@ extern unsigned long uml_physmem;
 #define access_ok_tt(type, addr, size) \
         (is_stack(addr, size))
 
-extern unsigned long get_fault_addr(void);
-
 extern int __do_copy_from_user(void *to, const void *from, int n,
                                void **fault_addr, void **fault_catcher);
 extern int __do_strncpy_from_user(char *dst, const char *src, size_t n,
diff --git a/arch/um/include/um_malloc.h b/arch/um/include/um_malloc.h
index 0363a9b53f8d..e6d7c5aa3f4e 100644
--- a/arch/um/include/um_malloc.h
+++ b/arch/um/include/um_malloc.h
@@ -11,7 +11,6 @@ extern void *um_kmalloc_atomic(int size);
 extern void kfree(const void *ptr);
 
 extern void *um_vmalloc(int size);
-extern void *um_vmalloc_atomic(int size);
 extern void vfree(void *ptr);
 
 #endif /* __UM_MALLOC_H__ */
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index 90c9ffafc659..d6d3319b3670 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -54,11 +54,9 @@
  */
 struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } };
 
-int external_pid(void *t)
+static inline int external_pid(struct task_struct *task)
 {
-        struct task_struct *task = t ? t : current;
-
-        return(CHOOSE_MODE_PROC(external_pid_tt, external_pid_skas, task));
+        return CHOOSE_MODE_PROC(external_pid_tt, external_pid_skas, task);
 }
 
 int pid_to_processor_id(int pid)
@@ -66,9 +64,10 @@ int pid_to_processor_id(int pid)
         int i;
 
         for(i = 0; i < ncpus; i++){
-                if(cpu_tasks[i].pid == pid) return(i);
+                if(cpu_tasks[i].pid == pid)
+                        return i;
         }
-        return(-1);
+        return -1;
 }
 
 void free_stack(unsigned long stack, int order)
@@ -85,9 +84,9 @@ unsigned long alloc_stack(int order, int atomic)
                 flags = GFP_ATOMIC;
         page = __get_free_pages(flags, order);
         if(page == 0)
-                return(0);
+                return 0;
         stack_protections(page);
-        return(page);
+        return page;
 }
 
 int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
@@ -100,13 +99,11 @@ int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
                       &current->thread.regs, 0, NULL, NULL);
         if(pid < 0)
                 panic("do_fork failed in kernel_thread, errno = %d", pid);
-        return(pid);
+        return pid;
 }
 
-void set_current(void *t)
+static inline void set_current(struct task_struct *task)
 {
-        struct task_struct *task = t;
-
         cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task)
                 { external_pid(task), task });
 }
@@ -128,14 +125,16 @@ void *_switch_to(void *prev, void *next, void *last)
                 prev= current;
         } while(current->thread.saved_task);
 
-        return(current->thread.prev_sched);
+        return current->thread.prev_sched;
 
 }
 
 void interrupt_end(void)
 {
-        if(need_resched()) schedule();
-        if(test_tsk_thread_flag(current, TIF_SIGPENDING)) do_signal();
+        if(need_resched())
+                schedule();
+        if(test_tsk_thread_flag(current, TIF_SIGPENDING))
+                do_signal();
 }
 
 void release_thread(struct task_struct *task)
@@ -150,7 +149,7 @@ void exit_thread(void)
 
 void *get_current(void)
 {
-        return(current);
+        return current;
 }
 
 int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
@@ -188,15 +187,12 @@ void initial_thread_cb(void (*proc)(void *), void *arg)
         kmalloc_ok = save_kmalloc_ok;
 }
 
+#ifdef CONFIG_MODE_TT
 unsigned long stack_sp(unsigned long page)
 {
-        return(page + PAGE_SIZE - sizeof(void *));
-}
-
-int current_pid(void)
-{
-        return(current->pid);
+        return page + PAGE_SIZE - sizeof(void *);
 }
+#endif
 
 void default_idle(void)
 {
@@ -223,7 +219,7 @@ void cpu_idle(void)
 
 int page_size(void)
 {
-        return(PAGE_SIZE);
+        return PAGE_SIZE;
 }
 
 void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
@@ -236,68 +232,43 @@ void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
         pte_t ptent;
 
         if(task->mm == NULL)
-                return(ERR_PTR(-EINVAL));
+                return ERR_PTR(-EINVAL);
         pgd = pgd_offset(task->mm, addr);
         if(!pgd_present(*pgd))
-                return(ERR_PTR(-EINVAL));
+                return ERR_PTR(-EINVAL);
 
         pud = pud_offset(pgd, addr);
         if(!pud_present(*pud))
-                return(ERR_PTR(-EINVAL));
+                return ERR_PTR(-EINVAL);
 
         pmd = pmd_offset(pud, addr);
         if(!pmd_present(*pmd))
-                return(ERR_PTR(-EINVAL));
+                return ERR_PTR(-EINVAL);
 
         pte = pte_offset_kernel(pmd, addr);
         ptent = *pte;
         if(!pte_present(ptent))
-                return(ERR_PTR(-EINVAL));
+                return ERR_PTR(-EINVAL);
 
         if(pte_out != NULL)
                 *pte_out = ptent;
-        return((void *) (pte_val(ptent) & PAGE_MASK) + (addr & ~PAGE_MASK));
+        return (void *) (pte_val(ptent) & PAGE_MASK) + (addr & ~PAGE_MASK);
 }
 
 char *current_cmd(void)
 {
 #if defined(CONFIG_SMP) || defined(CONFIG_HIGHMEM)
-        return("(Unknown)");
+        return "(Unknown)";
 #else
         void *addr = um_virt_to_phys(current, current->mm->arg_start, NULL);
         return IS_ERR(addr) ? "(Unknown)": __va((unsigned long) addr);
 #endif
 }
 
-void force_sigbus(void)
-{
-        printk(KERN_ERR "Killing pid %d because of a lack of memory\n",
-               current->pid);
-        lock_kernel();
-        sigaddset(&current->pending.signal, SIGBUS);
-        recalc_sigpending();
-        current->flags |= PF_SIGNALED;
-        do_exit(SIGBUS | 0x80);
-}
-
 void dump_thread(struct pt_regs *regs, struct user *u)
 {
 }
 
-void enable_hlt(void)
-{
-        panic("enable_hlt");
-}
-
-EXPORT_SYMBOL(enable_hlt);
-
-void disable_hlt(void)
-{
-        panic("disable_hlt");
-}
-
-EXPORT_SYMBOL(disable_hlt);
-
 void *um_kmalloc(int size)
 {
         return kmalloc(size, GFP_KERNEL);
@@ -313,36 +284,17 @@ void *um_vmalloc(int size)
         return vmalloc(size);
 }
 
-void *um_vmalloc_atomic(int size)
-{
-        return __vmalloc(size, GFP_ATOMIC | __GFP_HIGHMEM, PAGE_KERNEL);
-}
-
 int __cant_sleep(void) {
         return in_atomic() || irqs_disabled() || in_interrupt();
         /* Is in_interrupt() really needed? */
 }
 
-unsigned long get_fault_addr(void)
-{
-        return((unsigned long) current->thread.fault_addr);
-}
-
-EXPORT_SYMBOL(get_fault_addr);
-
-void not_implemented(void)
-{
-        printk(KERN_DEBUG "Something isn't implemented in here\n");
-}
-
-EXPORT_SYMBOL(not_implemented);
-
 int user_context(unsigned long sp)
 {
         unsigned long stack;
 
         stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER);
-        return(stack != (unsigned long) current_thread);
+        return stack != (unsigned long) current_thread;
 }
 
 extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end;
@@ -363,22 +315,22 @@ char *uml_strdup(char *string)
 
 int copy_to_user_proc(void __user *to, void *from, int size)
 {
-        return(copy_to_user(to, from, size));
+        return copy_to_user(to, from, size);
 }
 
 int copy_from_user_proc(void *to, void __user *from, int size)
 {
-        return(copy_from_user(to, from, size));
+        return copy_from_user(to, from, size);
 }
 
 int clear_user_proc(void __user *buf, int size)
 {
-        return(clear_user(buf, size));
+        return clear_user(buf, size);
 }
 
 int strlen_user_proc(char __user *str)
 {
-        return(strlen_user(str));
+        return strlen_user(str);
 }
 
 int smp_sigio_handler(void)
@@ -387,14 +339,14 @@ int smp_sigio_handler(void)
         int cpu = current_thread->cpu;
         IPI_handler(cpu);
         if(cpu != 0)
-                return(1);
+                return 1;
 #endif
-        return(0);
+        return 0;
 }
 
 int cpu(void)
 {
-        return(current_thread->cpu);
+        return current_thread->cpu;
 }
 
 static atomic_t using_sysemu = ATOMIC_INIT(0);
@@ -443,7 +395,7 @@ int __init make_proc_sysemu(void)
         if (ent == NULL)
         {
                 printk(KERN_WARNING "Failed to register /proc/sysemu\n");
-                return(0);
+                return 0;
         }
 
         ent->read_proc  = proc_read_sysemu;