Commit 1f9d6582 authored by Ingo Molnar's avatar Ingo Molnar Committed by Linus Torvalds

[PATCH] clone-cleanup 2.5.32-BK

This moves CLONE_SETTID and CLONE_CLEARTID handling into kernel/fork.c,
where it belongs.  [the CLONE_SETTLS is x86-specific and thus remains in
the per-arch process.c] This makes support for these two new flags much
easier: architectures only have to pass in the user_tid pointer.
parent a27b8fe9
......@@ -504,7 +504,7 @@ int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
regs.eflags = 0x286;
/* Ok, create the new process.. */
p = do_fork(flags | CLONE_VM, 0, &regs, 0);
p = do_fork(flags | CLONE_VM, 0, &regs, 0, NULL);
return IS_ERR(p) ? PTR_ERR(p) : p->pid;
}
......@@ -587,11 +587,6 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long esp,
IO_BITMAP_BYTES);
}
/*
* The common fastpath:
*/
if (!(clone_flags & (CLONE_SETTLS | CLONE_SETTID | CLONE_CLEARTID)))
return 0;
/*
* Set a new TLS for the child thread?
*/
......@@ -613,19 +608,6 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long esp,
desc->a = LDT_entry_a(&info);
desc->b = LDT_entry_b(&info);
}
/*
* Notify the child of the TID?
*/
if (clone_flags & CLONE_SETTID)
if (put_user(p->pid, (pid_t *)childregs->edx))
return -EFAULT;
/*
* Does the userspace VM want the TID cleared on mm_release()?
*/
if (clone_flags & CLONE_CLEARTID)
p->user_tid = (int *) childregs->edx;
return 0;
}
......@@ -779,7 +761,7 @@ asmlinkage int sys_fork(struct pt_regs regs)
{
struct task_struct *p;
p = do_fork(SIGCHLD, regs.esp, &regs, 0);
p = do_fork(SIGCHLD, regs.esp, &regs, 0, NULL);
return IS_ERR(p) ? PTR_ERR(p) : p->pid;
}
......@@ -788,12 +770,14 @@ asmlinkage int sys_clone(struct pt_regs regs)
struct task_struct *p;
unsigned long clone_flags;
unsigned long newsp;
int *user_tid;
clone_flags = regs.ebx;
newsp = regs.ecx;
user_tid = (int *)regs.edx;
if (!newsp)
newsp = regs.esp;
p = do_fork(clone_flags & ~CLONE_IDLETASK, newsp, &regs, 0);
p = do_fork(clone_flags & ~CLONE_IDLETASK, newsp, &regs, 0, user_tid);
return IS_ERR(p) ? PTR_ERR(p) : p->pid;
}
......@@ -811,7 +795,7 @@ asmlinkage int sys_vfork(struct pt_regs regs)
{
struct task_struct *p;
p = do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.esp, &regs, 0);
p = do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.esp, &regs, 0, NULL);
return IS_ERR(p) ? PTR_ERR(p) : p->pid;
}
......
......@@ -495,7 +495,7 @@ static struct task_struct * __init fork_by_hand(void)
* don't care about the eip and regs settings since
* we'll never reschedule the forked task.
*/
return do_fork(CLONE_VM|CLONE_IDLETASK, 0, &regs, 0);
return do_fork(CLONE_VM|CLONE_IDLETASK, 0, &regs, 0, NULL);
}
/* which physical APIC ID maps to which logical CPU number */
......
......@@ -660,7 +660,7 @@ extern void daemonize(void);
extern task_t *child_reaper;
extern int do_execve(char *, char **, char **, struct pt_regs *);
extern struct task_struct *do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long);
extern struct task_struct *do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int *);
extern void FASTCALL(add_wait_queue(wait_queue_head_t *q, wait_queue_t * wait));
extern void FASTCALL(add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t * wait));
......
......@@ -649,7 +649,8 @@ static inline void copy_flags(unsigned long clone_flags, struct task_struct *p)
static struct task_struct *copy_process(unsigned long clone_flags,
unsigned long stack_start,
struct pt_regs *regs,
unsigned long stack_size)
unsigned long stack_size,
int *user_tid)
{
int retval;
struct task_struct *p = NULL;
......@@ -760,6 +761,19 @@ static struct task_struct *copy_process(unsigned long clone_flags,
retval = copy_thread(0, clone_flags, stack_start, stack_size, p, regs);
if (retval)
goto bad_fork_cleanup_namespace;
/*
* Notify the child of the TID?
*/
retval = -EFAULT;
if (clone_flags & CLONE_SETTID)
if (put_user(p->pid, user_tid))
goto bad_fork_cleanup_namespace;
/*
* Does the userspace VM want the TID cleared on mm_release()?
*/
if (clone_flags & CLONE_CLEARTID)
p->user_tid = user_tid;
/* Our parent execution domain becomes current domain
These must match for thread signalling to apply */
......@@ -876,11 +890,12 @@ static struct task_struct *copy_process(unsigned long clone_flags,
struct task_struct *do_fork(unsigned long clone_flags,
unsigned long stack_start,
struct pt_regs *regs,
unsigned long stack_size)
unsigned long stack_size,
int *user_tid)
{
struct task_struct *p;
p = copy_process(clone_flags, stack_start, regs, stack_size);
p = copy_process(clone_flags, stack_start, regs, stack_size, user_tid);
if (!IS_ERR(p)) {
struct completion vfork;
......
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