[-mm PATCH] list, perf: fix list_force_poison() build regression

[Dan Williams <dan.j.williams@intel.com>]

    In file included from
    /home/sfr/next/next/tools/include/linux/list.h:5:0,
                     from arch/../util/map.h:6,
                     from arch/../util/event.h:8,
                     from arch/../util/debug.h:7,
                     from arch/common.c:4:
    include/linux/list.h: In function 'list_force_poison':
    include/linux/list.h:123:56: error: unused parameter 'entry' [-Werror=unused-parameter]
     static inline void list_force_poison(struct list_head *entry)

perf does not like the empty definition of list_force_poison.  For
simplicity just switch to list_del in the non-debug case.

Fixes "mm, dax, pmem: introduce {get|put}_dev_pagemap() for dax-gup" in
-next.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
 include/linux/list.h |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/include/linux/list.h b/include/linux/list.h
index d870ba3315f8..ebf5f358e8c3 100644
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -120,9 +120,8 @@ extern void list_del(struct list_head *entry);
  */
 extern void list_force_poison(struct list_head *entry);
 #else
-static inline void list_force_poison(struct list_head *entry)
-{
-}
+/* fallback to the less strict LIST_POISON* definitions */
+#define list_force_poison list_del
 #endif
 
 /**

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