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authorAl Viro <viro@zeniv.linux.org.uk>2012-10-15 16:26:03 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-10-31 22:59:31 -0400
commitea4a1da9b2e6f419526b5fde15cd5563096368eb (patch)
tree470d747b0ea28293467292ac88f083e6b2370a29 /arch/m32r/kernel/process.c
parentddffeb8c4d0331609ef2581d84de4d763607bd37 (diff)
downloadlinux-ea4a1da9b2e6f419526b5fde15cd5563096368eb.tar.bz2
m32r: switch to generic kernel_thread()/kernel_execve()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/m32r/kernel/process.c')
-rw-r--r--arch/m32r/kernel/process.c60
1 files changed, 16 insertions, 44 deletions
diff --git a/arch/m32r/kernel/process.c b/arch/m32r/kernel/process.c
index e7366276ef30..fa89f027c04a 100644
--- a/arch/m32r/kernel/process.c
+++ b/arch/m32r/kernel/process.c
@@ -165,41 +165,6 @@ void show_regs(struct pt_regs * regs)
}
/*
- * Create a kernel thread
- */
-
-/*
- * This is the mechanism for creating a new kernel thread.
- *
- * NOTE! Only a kernel-only process(ie the swapper or direct descendants
- * who haven't done an "execve()") should use this: it will work within
- * a system call from a "real" process, but the process memory space will
- * not be free'd until both the parent and the child have exited.
- */
-static void kernel_thread_helper(void *nouse, int (*fn)(void *), void *arg)
-{
- fn(arg);
- do_exit(-1);
-}
-
-int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(&regs, 0, sizeof (regs));
- regs.r1 = (unsigned long)fn;
- regs.r2 = (unsigned long)arg;
-
- regs.bpc = (unsigned long)kernel_thread_helper;
-
- regs.psw = M32R_PSW_BIE;
-
- /* Ok, create the new process. */
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL,
- NULL);
-}
-
-/*
* Free current thread data structures etc..
*/
void exit_thread(void)
@@ -227,19 +192,26 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
}
int copy_thread(unsigned long clone_flags, unsigned long spu,
- unsigned long unused, struct task_struct *tsk, struct pt_regs *regs)
+ unsigned long arg, struct task_struct *tsk, struct pt_regs *regs)
{
struct pt_regs *childregs = task_pt_regs(tsk);
extern void ret_from_fork(void);
-
- /* Copy registers */
- *childregs = *regs;
-
- childregs->spu = spu;
- childregs->r0 = 0; /* Child gets zero as return value */
- regs->r0 = tsk->pid;
+ extern void ret_from_kernel_thread(void);
+
+ if (unlikely(tsk->flags & PF_KTHREAD)) {
+ memset(childregs, 0, sizeof(struct pt_regs));
+ childregs->psw = M32R_PSW_BIE;
+ childregs->r1 = spu; /* fn */
+ childregs->r0 = arg;
+ tsk->thread.lr = (unsigned long)ret_from_kernel_thread;
+ } else {
+ /* Copy registers */
+ *childregs = *regs;
+ childregs->spu = spu;
+ childregs->r0 = 0; /* Child gets zero as return value */
+ tsk->thread.lr = (unsigned long)ret_from_fork;
+ }
tsk->thread.sp = (unsigned long)childregs;
- tsk->thread.lr = (unsigned long)ret_from_fork;
return 0;
}