[PATCH V2 2/4] mm: introduce kvfree_atomic()

[Lai Jiangshan <laijs@cn.fujitsu.com>]

fdtable and sysipc use vfree() in RCU callback. this patch
introduce vfree_atomic() for them.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
---
diff --git a/include/linux/mm.h b/include/linux/mm.h
index ff89388..aa7b5ca 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -280,6 +280,7 @@ static inline int is_vmalloc_addr(const void *x)
 
 void *kvmalloc(unsigned long size, gfp_t flags);
 void kvfree(void *ptr);
+void kvfree_atomic(void *ptr);
 
 static inline struct page *compound_head(struct page *page)
 {
diff --git a/mm/util.c b/mm/util.c
index 66d1a12..ed2d317 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -197,6 +197,15 @@ void kvfree(void *ptr)
 }
 EXPORT_SYMBOL(kvfree);
 
+void kvfree_atomic(void *ptr)
+{
+	if (is_vmalloc_addr(ptr))
+		vfree_atomic(ptr);
+	else
+		kfree(ptr);
+}
+EXPORT_SYMBOL(kvfree_atomic);
+
 #ifndef HAVE_ARCH_PICK_MMAP_LAYOUT
 void arch_pick_mmap_layout(struct mm_struct *mm)
 {