Merge branch 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[firefly-linux-kernel-4.4.55.git] / kernel / fork.c

diff --git a/kernel/fork.c b/kernel/fork.c
index b9372a0bff18c2a042cb4ef7f6d6ea7b25a3583c..05c813dc9ecc50efbf9012e765dfc64b8ddf9b6b 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -34,6 +34,7 @@
 #include <linux/cgroup.h>
 #include <linux/security.h>
 #include <linux/hugetlb.h>
+#include <linux/seccomp.h>
 #include <linux/swap.h>
 #include <linux/syscalls.h>
 #include <linux/jiffies.h>
@@ -47,6 +48,7 @@
 #include <linux/audit.h>
 #include <linux/memcontrol.h>
 #include <linux/ftrace.h>
+#include <linux/proc_fs.h>
 #include <linux/profile.h>
 #include <linux/rmap.h>
 #include <linux/ksm.h>
@@ -111,32 +113,67 @@ int nr_processes(void)
        return total;
 }
 
-#ifndef __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
-# define alloc_task_struct_node(node)          \
-               kmem_cache_alloc_node(task_struct_cachep, GFP_KERNEL, node)
-# define free_task_struct(tsk)                 \
-               kmem_cache_free(task_struct_cachep, (tsk))
+#ifndef CONFIG_ARCH_TASK_STRUCT_ALLOCATOR
 static struct kmem_cache *task_struct_cachep;
+
+static inline struct task_struct *alloc_task_struct_node(int node)
+{
+       return kmem_cache_alloc_node(task_struct_cachep, GFP_KERNEL, node);
+}
+
+void __weak arch_release_task_struct(struct task_struct *tsk) { }
+
+static inline void free_task_struct(struct task_struct *tsk)
+{
+       arch_release_task_struct(tsk);
+       kmem_cache_free(task_struct_cachep, tsk);
+}
 #endif
 
-#ifndef __HAVE_ARCH_THREAD_INFO_ALLOCATOR
+#ifndef CONFIG_ARCH_THREAD_INFO_ALLOCATOR
+void __weak arch_release_thread_info(struct thread_info *ti) { }
+
+/*
+ * Allocate pages if THREAD_SIZE is >= PAGE_SIZE, otherwise use a
+ * kmemcache based allocator.
+ */
+# if THREAD_SIZE >= PAGE_SIZE
 static struct thread_info *alloc_thread_info_node(struct task_struct *tsk,
                                                  int node)
 {
-#ifdef CONFIG_DEBUG_STACK_USAGE
-       gfp_t mask = GFP_KERNEL | __GFP_ZERO;
-#else
-       gfp_t mask = GFP_KERNEL;
-#endif
-       struct page *page = alloc_pages_node(node, mask, THREAD_SIZE_ORDER);
+       struct page *page = alloc_pages_node(node, THREADINFO_GFP,
+                                            THREAD_SIZE_ORDER);
 
        return page ? page_address(page) : NULL;
 }
 
 static inline void free_thread_info(struct thread_info *ti)
 {
+       arch_release_thread_info(ti);
        free_pages((unsigned long)ti, THREAD_SIZE_ORDER);
 }
+# else
+static struct kmem_cache *thread_info_cache;
+
+static struct thread_info *alloc_thread_info_node(struct task_struct *tsk,
+                                                 int node)
+{
+       return kmem_cache_alloc_node(thread_info_cache, THREADINFO_GFP, node);
+}
+
+static void free_thread_info(struct thread_info *ti)
+{
+       arch_release_thread_info(ti);
+       kmem_cache_free(thread_info_cache, ti);
+}
+
+void thread_info_cache_init(void)
+{
+       thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,
+                                             THREAD_SIZE, 0, NULL);
+       BUG_ON(thread_info_cache == NULL);
+}
+# endif
 #endif
 
 /* SLAB cache for signal_struct structures (tsk->signal) */
@@ -170,6 +207,7 @@ void free_task(struct task_struct *tsk)
        free_thread_info(tsk->stack);
        rt_mutex_debug_task_free(tsk);
        ftrace_graph_exit_task(tsk);
+       put_seccomp_filter(tsk);
        free_task_struct(tsk);
 }
 EXPORT_SYMBOL(free_task);
@@ -203,17 +241,11 @@ void __put_task_struct(struct task_struct *tsk)
 }
 EXPORT_SYMBOL_GPL(__put_task_struct);
 
-/*
- * macro override instead of weak attribute alias, to workaround
- * gcc 4.1.0 and 4.1.1 bugs with weak attribute and empty functions.
- */
-#ifndef arch_task_cache_init
-#define arch_task_cache_init()
-#endif
+void __init __weak arch_task_cache_init(void) { }
 
 void __init fork_init(unsigned long mempages)
 {
-#ifndef __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
+#ifndef CONFIG_ARCH_TASK_STRUCT_ALLOCATOR
 #ifndef ARCH_MIN_TASKALIGN
 #define ARCH_MIN_TASKALIGN     L1_CACHE_BYTES
 #endif
@@ -260,8 +292,6 @@ static struct task_struct *dup_task_struct(struct task_struct *orig)
        int node = tsk_fork_get_node(orig);
        int err;
 
-       prepare_to_copy(orig);
-
        tsk = alloc_task_struct_node(node);
        if (!tsk)
                return NULL;
@@ -1162,6 +1192,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                goto fork_out;
 
        ftrace_graph_init_task(p);
+       get_seccomp_filter(p);
 
        rt_mutex_init_task(p);
 
@@ -1464,6 +1495,8 @@ bad_fork_cleanup_io:
        if (p->io_context)
                exit_io_context(p);
 bad_fork_cleanup_namespaces:
+       if (unlikely(clone_flags & CLONE_NEWPID))
+               pid_ns_release_proc(p->nsproxy->pid_ns);
        exit_task_namespaces(p);
 bad_fork_cleanup_mm:
        if (p->mm)