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

[tip-bot for Thomas Gleixner]

Commit-ID:  ead97a49ec3a3cb9b5133acbfed9a49b91ebf37c
Gitweb:     https://git.kernel.org/tip/ead97a49ec3a3cb9b5133acbfed9a49b91ebf37c
Author:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Wed, 10 Apr 2019 12:28:07 +0200
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Sun, 14 Apr 2019 19:58:31 +0200

mm/kasan: 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: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
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: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: kasan-dev@xxxxxxxxxxxxxxxx
Cc: linux-mm@xxxxxxxxx
Link: https://lkml.kernel.org/r/20190410103644.750219625@xxxxxxxxxxxxx

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

diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 80bbe62b16cd..38e5f20a775a 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -74,9 +74,6 @@ static inline depot_stack_handle_t save_stack(gfp_t flags)
 
 	save_stack_trace(&trace);
 	filter_irq_stacks(&trace);
-	if (trace.nr_entries != 0 &&
-	    trace.entries[trace.nr_entries-1] == ULONG_MAX)
-		trace.nr_entries--;
 
 	return depot_save_stack(&trace, flags);
 }