[tip:core/stacktrace] mm/page_owner: Remove the ULONG_MAX stack trace hackery

[tip-bot for Thomas Gleixner]

Commit-ID:  4621c9858f05ab08434221e3a15cc8098645ef2a
Gitweb:     https://git.kernel.org/tip/4621c9858f05ab08434221e3a15cc8098645ef2a
Author:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Wed, 10 Apr 2019 12:28:06 +0200
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Sun, 14 Apr 2019 19:58:30 +0200

mm/page_owner: Remove the ULONG_MAX stack trace hackery

No architecture terminates the stack trace with ULONG_MAX anymore. Remove
the cruft.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/20190410103644.661974663@xxxxxxxxxxxxx

---
 mm/page_owner.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/mm/page_owner.c b/mm/page_owner.c
index 925b6f44a444..df277e6bc3c6 100644
--- a/mm/page_owner.c
+++ b/mm/page_owner.c
@@ -148,9 +148,6 @@ static noinline depot_stack_handle_t save_stack(gfp_t flags)
 	depot_stack_handle_t handle;
 
 	save_stack_trace(&trace);
-	if (trace.nr_entries != 0 &&
-	    trace.entries[trace.nr_entries-1] == ULONG_MAX)
-		trace.nr_entries--;
 
 	/*
 	 * We need to check recursion here because our request to stackdepot