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-rw-r--r--arch/x86/mm/pageattr_64.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/x86/mm/pageattr_64.c b/arch/x86/mm/pageattr_64.c
index 8a4f65bf956..c7b7dfe1d40 100644
--- a/arch/x86/mm/pageattr_64.c
+++ b/arch/x86/mm/pageattr_64.c
@@ -230,9 +230,14 @@ void global_flush_tlb(void)
struct page *pg, *next;
struct list_head l;
- down_read(&init_mm.mmap_sem);
+ /*
+ * Write-protect the semaphore, to exclude two contexts
+ * doing a list_replace_init() call in parallel and to
+ * exclude new additions to the deferred_pages list:
+ */
+ down_write(&init_mm.mmap_sem);
list_replace_init(&deferred_pages, &l);
- up_read(&init_mm.mmap_sem);
+ up_write(&init_mm.mmap_sem);
flush_map(&l);