Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  smp_call_function_single(): be slightly less stupid, fix #2
  lockdep, mm: fix might_fault() annotation

1 files changed, 9 insertions, 0 deletions

diff --git a/mm/memory.c b/mm/memory.c
index e009ce870859..c2d4c477e5bb 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3165,6 +3165,15 @@ void print_vma_addr(char *prefix, unsigned long ip)
 #ifdef CONFIG_PROVE_LOCKING
 void might_fault(void)
 {
+        /*
+         * Some code (nfs/sunrpc) uses socket ops on kernel memory while
+         * holding the mmap_sem, this is safe because kernel memory doesn't
+         * get paged out, therefore we'll never actually fault, and the
+         * below annotations will generate false positives.
+         */
+        if (segment_eq(get_fs(), KERNEL_DS))
+                return;
+
         might_sleep();
         /*
          * it would be nicer only to annotate paths which are not under