x86/smpboot: Init apic mapping before usage

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

diff --git a/kernel/fork.c b/kernel/fork.c
index 9a05bd9..623259f 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -359,6 +359,12 @@ static inline void free_signal_struct(struct signal_struct *sig)
 {
        taskstats_tgid_free(sig);
        sched_autogroup_exit(sig);
+       /*
+        * __mmdrop is not safe to call from softirq context on x86 due to
+        * pgd_dtor so postpone it to the async context
+        */
+       if (sig->oom_mm)
+               mmdrop_async(sig->oom_mm);
        kmem_cache_free(signal_cachep, sig);
 }
 
@@ -541,7 +547,8 @@ free_tsk:
 }
 
 #ifdef CONFIG_MMU
-static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm)
+static __latent_entropy int dup_mmap(struct mm_struct *mm,
+                                       struct mm_struct *oldmm)
 {
        struct vm_area_struct *mpnt, *tmp, *prev, **pprev;
        struct rb_node **rb_link, *rb_parent;
@@ -848,6 +855,7 @@ static inline void __mmput(struct mm_struct *mm)
        ksm_exit(mm);
        khugepaged_exit(mm); /* must run before exit_mmap */
        exit_mmap(mm);
+       mm_put_huge_zero_page(mm);
        set_mm_exe_file(mm, NULL);
        if (!list_empty(&mm->mmlist)) {
                spin_lock(&mmlist_lock);
@@ -856,6 +864,7 @@ static inline void __mmput(struct mm_struct *mm)
        }
        if (mm->binfmt)
                module_put(mm->binfmt->module);
+       set_bit(MMF_OOM_SKIP, &mm->flags);
        mmdrop(mm);
 }
 
@@ -1433,7 +1442,8 @@ init_task_pid(struct task_struct *task, enum pid_type type, struct pid *pid)
  * parts of the process environment (as per the clone
  * flags). The actual kick-off is left to the caller.
  */
-static struct task_struct *copy_process(unsigned long clone_flags,
+static __latent_entropy struct task_struct *copy_process(
+                                       unsigned long clone_flags,
                                        unsigned long stack_start,
                                        unsigned long stack_size,
                                        int __user *child_tidptr,
@@ -1918,6 +1928,7 @@ long _do_fork(unsigned long clone_flags,
 
        p = copy_process(clone_flags, stack_start, stack_size,
                         child_tidptr, NULL, trace, tls, NUMA_NO_NODE);
+       add_latent_entropy();
        /*
         * Do this prior waking up the new thread - the thread pointer
         * might get invalid after that point, if the thread exits quickly.