linux-kernel - [tip:core/stacktrace] mm/page_owner: Remove the ULONG

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Date:   Sun, 14 Apr 2019 13:41:33 -0700
From:   tip-bot for Thomas Gleixner <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     glider@...gle.com, akpm@...ux-foundation.org, hpa@...or.com,
        jpoimboe@...hat.com, rppt@...ux.vnet.ibm.com, mhocko@...e.com,
        rostedt@...dmis.org, mingo@...nel.org,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        luto@...nel.org, tglx@...utronix.de
Subject: [tip:core/stacktrace] mm/page_owner: Remove the ULONG_MAX stack
 trace hackery

Commit-ID:  4621c9858f05ab08434221e3a15cc8098645ef2a
Gitweb:     https://git.kernel.org/tip/4621c9858f05ab08434221e3a15cc8098645ef2a
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Wed, 10 Apr 2019 12:28:06 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
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@...utronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Alexander Potapenko <glider@...gle.com>
Cc: Michal Hocko <mhocko@...e.com>
Cc: linux-mm@...ck.org
Cc: Mike Rapoport <rppt@...ux.vnet.ibm.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Link: https://lkml.kernel.org/r/20190410103644.661974663@linutronix.de

---
 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