tracing: Prevent buffer overwrite disabled for latency tracers

[deliverable/linux.git] / kernel / fork.c

diff --git a/kernel/fork.c b/kernel/fork.c
index 65ca6d27f24e1065013a428f12f33935b1b18490..4133876d8cd23838037bb62540197f2308578685 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1233,6 +1233,12 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 #ifndef CONFIG_VIRT_CPU_ACCOUNTING
        p->prev_cputime.utime = p->prev_cputime.stime = 0;
 #endif
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
+       seqlock_init(&p->vtime_seqlock);
+       p->vtime_snap = 0;
+       p->vtime_snap_whence = VTIME_SLEEPING;
+#endif
+
 #if defined(SPLIT_RSS_COUNTING)
        memset(&p->rss_stat, 0, sizeof(p->rss_stat));
 #endif
@@ -1668,8 +1674,10 @@ SYSCALL_DEFINE5(clone, unsigned long, clone_flags, unsigned long, newsp,
                 int, tls_val)
 #endif
 {
-       return do_fork(clone_flags, newsp, 0,
-               parent_tidptr, child_tidptr);
+       long ret = do_fork(clone_flags, newsp, 0, parent_tidptr, child_tidptr);
+       asmlinkage_protect(5, ret, clone_flags, newsp,
+                       parent_tidptr, child_tidptr, tls_val);
+       return ret;
 }
 #endif