patch-2.4.20 linux-2.4.20/arch/s390x/kernel/process.c
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- Lines: 44
- Date:
Thu Nov 28 15:53:11 2002
- Orig file:
linux-2.4.19/arch/s390x/kernel/process.c
- Orig date:
Fri Aug 2 17:39:43 2002
diff -urN linux-2.4.19/arch/s390x/kernel/process.c linux-2.4.20/arch/s390x/kernel/process.c
@@ -183,6 +183,43 @@
return 0;
}
+/*
+ * Allocation and freeing of basic task resources.
+ * The task struct and the stack go together.
+ *
+ * NOTE: An order-2 allocation can easily fail. If this
+ * happens we fall back to using vmalloc ...
+ */
+
+struct task_struct *alloc_task_struct(void)
+{
+ struct task_struct *tsk = __get_free_pages(GFP_KERNEL, 2);
+ if (!tsk)
+ tsk = vmalloc(16384);
+ if (!tsk)
+ return NULL;
+
+ atomic_set((atomic_t *)(tsk + 1), 1);
+ return tsk;
+}
+
+void free_task_struct(struct task_struct *tsk)
+{
+ if (atomic_dec_and_test((atomic_t *)(tsk + 1)))
+ {
+ if ((unsigned long)tsk < VMALLOC_START)
+ free_pages((unsigned long)tsk, 2);
+ else
+ vfree(tsk);
+ }
+}
+
+void get_task_struct(struct task_struct *tsk)
+{
+ atomic_inc((atomic_t *)(tsk + 1));
+}
+
+
asmlinkage int sys_fork(struct pt_regs regs)
{
return do_fork(SIGCHLD, regs.gprs[15], ®s, 0);
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