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flagday: kill pt_regs argument of do_fork()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-10-22 23:10:08 -04:00
parent 18c26c27ae
commit e80d6661c3
9 changed files with 19 additions and 26 deletions
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2
arch/blackfin/kernel/process.c
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@ -135,7 +135,7 @@ asmlinkage int bfin_clone(unsigned long clone_flags, unsigned long newsp)
#endif
if (newsp)
newsp -= 12;
return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
return do_fork(clone_flags, newsp, 0, NULL, NULL);
}
int

14
arch/ia64/kernel/entry.S
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@ -116,13 +116,12 @@ GLOBAL_ENTRY(sys_clone2)
mov loc1=r16 // save ar.pfs across do_fork
.body
mov out1=in1
mov out3=in2
mov out2=in2
tbit.nz p6,p0=in0,CLONE_SETTLS_BIT
mov out4=in3 // parent_tidptr: valid only w/CLONE_PARENT_SETTID
mov out3=in3 // parent_tidptr: valid only w/CLONE_PARENT_SETTID
;;
(p6) st8 [r2]=in5 // store TLS in r16 for copy_thread()
mov out5=in4 // child_tidptr: valid only w/CLONE_CHILD_SETTID or CLONE_CHILD_CLEARTID
adds out2=IA64_SWITCH_STACK_SIZE+16,sp // out2 = &regs
mov out4=in4 // child_tidptr: valid only w/CLONE_CHILD_SETTID or CLONE_CHILD_CLEARTID
mov out0=in0 // out0 = clone_flags
br.call.sptk.many rp=do_fork
.ret1: .restore sp
@ -148,13 +147,12 @@ GLOBAL_ENTRY(sys_clone)
mov loc1=r16 // save ar.pfs across do_fork
.body
mov out1=in1
mov out3=16 // stacksize (compensates for 16-byte scratch area)
mov out2=16 // stacksize (compensates for 16-byte scratch area)
tbit.nz p6,p0=in0,CLONE_SETTLS_BIT
mov out4=in2 // parent_tidptr: valid only w/CLONE_PARENT_SETTID
mov out3=in2 // parent_tidptr: valid only w/CLONE_PARENT_SETTID
;;
(p6) st8 [r2]=in4 // store TLS in r13 (tp)
mov out5=in3 // child_tidptr: valid only w/CLONE_CHILD_SETTID or CLONE_CHILD_CLEARTID
adds out2=IA64_SWITCH_STACK_SIZE+16,sp // out2 = &regs
mov out4=in3 // child_tidptr: valid only w/CLONE_CHILD_SETTID or CLONE_CHILD_CLEARTID
mov out0=in0 // out0 = clone_flags
br.call.sptk.many rp=do_fork
.ret2: .restore sp

2
arch/m68k/kernel/process.c
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@ -149,7 +149,7 @@ void flush_thread(void)
asmlinkage int m68k_clone(struct pt_regs *regs)
{
/* regs will be equal to current_pt_regs() */
return do_fork(regs->d1, regs->d2, regs, 0,
return do_fork(regs->d1, regs->d2, 0,
(int __user *)regs->d3, (int __user *)regs->d4);
}

2
arch/mips/kernel/linux32.c
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@ -312,7 +312,7 @@ _sys32_clone(nabi_no_regargs struct pt_regs regs)
/* Use __dummy4 instead of getting it off the stack, so that
syscall() works. */
child_tidptr = (int __user *) __dummy4;
return do_fork(clone_flags, newsp, &regs, 0,
return do_fork(clone_flags, newsp, 0,
parent_tidptr, child_tidptr);
}

4
arch/mips/kernel/syscall.c
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@ -92,7 +92,7 @@ save_static_function(sys_fork);
static int __used noinline
_sys_fork(nabi_no_regargs struct pt_regs regs)
{
return do_fork(SIGCHLD, regs.regs[29], &regs, 0, NULL, NULL);
return do_fork(SIGCHLD, regs.regs[29], 0, NULL, NULL);
}
save_static_function(sys_clone);
@ -123,7 +123,7 @@ _sys_clone(nabi_no_regargs struct pt_regs regs)
#else
child_tidptr = (int __user *) regs.regs[8];
#endif
return do_fork(clone_flags, newsp, &regs, 0,
return do_fork(clone_flags, newsp, 0,
parent_tidptr, child_tidptr);
}

3
arch/sparc/kernel/process_32.c
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@ -286,8 +286,7 @@ asmlinkage int sparc_do_fork(unsigned long clone_flags,
parent_tid_ptr = regs->u_regs[UREG_I2];
child_tid_ptr = regs->u_regs[UREG_I4];
ret = do_fork(clone_flags, stack_start,
regs, stack_size,
ret = do_fork(clone_flags, stack_start, stack_size,
(int __user *) parent_tid_ptr,
(int __user *) child_tid_ptr);

3
arch/sparc/kernel/process_64.c
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@ -601,8 +601,7 @@ asmlinkage long sparc_do_fork(unsigned long clone_flags,
child_tid_ptr = (int __user *) regs->u_regs[UREG_I4];
}
ret = do_fork(clone_flags, stack_start,
regs, stack_size,
ret = do_fork(clone_flags, stack_start, stack_size,
parent_tid_ptr, child_tid_ptr);
/* If we get an error and potentially restart the system

2
include/linux/sched.h
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@ -2289,7 +2289,7 @@ extern int disallow_signal(int);
extern int do_execve(const char *,
const char __user * const __user *,
const char __user * const __user *);
extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *);
extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *);
struct task_struct *fork_idle(int);
#ifdef CONFIG_GENERIC_KERNEL_THREAD
extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);

13
kernel/fork.c
View File

@ -1527,8 +1527,6 @@ static inline void init_idle_pids(struct pid_link *links)
struct task_struct * __cpuinit fork_idle(int cpu)
{
struct task_struct *task;
struct pt_regs regs;
task = copy_process(CLONE_VM, 0, 0, NULL, &init_struct_pid, 0);
if (!IS_ERR(task)) {
init_idle_pids(task->pids);
@ -1546,7 +1544,6 @@ struct task_struct * __cpuinit fork_idle(int cpu)
*/
long do_fork(unsigned long clone_flags,
unsigned long stack_start,
struct pt_regs *regs,
unsigned long stack_size,
int __user *parent_tidptr,
int __user *child_tidptr)
@ -1576,7 +1573,7 @@ long do_fork(unsigned long clone_flags,
* requested, no event is reported; otherwise, report if the event
* for the type of forking is enabled.
*/
if (!(clone_flags & CLONE_UNTRACED) && likely(user_mode(regs))) {
if (!(clone_flags & CLONE_UNTRACED)) {
if (clone_flags & CLONE_VFORK)
trace = PTRACE_EVENT_VFORK;
else if ((clone_flags & CSIGNAL) != SIGCHLD)
@ -1632,7 +1629,7 @@ long do_fork(unsigned long clone_flags,
*/
pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
return do_fork(flags|CLONE_VM|CLONE_UNTRACED, (unsigned long)fn, NULL,
return do_fork(flags|CLONE_VM|CLONE_UNTRACED, (unsigned long)fn,
(unsigned long)arg, NULL, NULL);
}
#endif
@ -1641,7 +1638,7 @@ pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
SYSCALL_DEFINE0(fork)
{
#ifdef CONFIG_MMU
return do_fork(SIGCHLD, 0, current_pt_regs(), 0, NULL, NULL);
return do_fork(SIGCHLD, 0, 0, NULL, NULL);
#else
/* can not support in nommu mode */
return(-EINVAL);
@ -1652,7 +1649,7 @@ SYSCALL_DEFINE0(fork)
#ifdef __ARCH_WANT_SYS_VFORK
SYSCALL_DEFINE0(vfork)
{
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0, current_pt_regs(),
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, 0,
0, NULL, NULL);
}
#endif
@ -1675,7 +1672,7 @@ SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp,
int, tls_val)
#endif
{
return do_fork(clone_flags, newsp, current_pt_regs(), 0,
return do_fork(clone_flags, newsp, 0,
parent_tidptr, child_tidptr);
}
#endif