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SubjectRe: "fs/namei.c: keep track of nd->root refcount status" causes boot panic
On Tue, Sep 03, 2019 at 12:21:36AM -0400, Qian Cai wrote:
> The linux-next commit "fs/namei.c: keep track of nd->root refcount status” [1] causes boot panic on all
> architectures here on today’s linux-next (0902). Reverted it will fix the issue.

<swearing>

OK, I see what's going on. Incremental to be folded in:

diff --git a/include/linux/namei.h b/include/linux/namei.h
index 20ce2f917ef4..2ed0942a67f8 100644
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -20,8 +20,8 @@ enum {LAST_NORM, LAST_ROOT, LAST_DOT, LAST_DOTDOT, LAST_BIND};
#define LOOKUP_FOLLOW 0x0001 /* follow links at the end */
#define LOOKUP_DIRECTORY 0x0002 /* require a directory */
#define LOOKUP_AUTOMOUNT 0x0004 /* force terminal automount */
-#define LOOKUP_EMPTY 0x4000 /* accept empty path [user_... only] */
-#define LOOKUP_DOWN 0x8000 /* follow mounts in the starting point */
+#define LOOKUP_EMPTY 0x8000 /* accept empty path [user_... only] */
+#define LOOKUP_DOWN 0x10000 /* follow mounts in the starting point */

#define LOOKUP_REVAL 0x0020 /* tell ->d_revalidate() to trust no cache */
#define LOOKUP_RCU 0x0040 /* RCU pathwalk mode; semi-internal */
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