linux-kernel - [RFC patch 12/41] mm/page_owner: Remove the ULONG

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Message-Id: <20190410103644.661974663@linutronix.de>
Date:   Wed, 10 Apr 2019 12:28:06 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org,
        Andy Lutomirski <luto@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Alexander Potapenko <glider@...gle.com>,
        Michal Hocko <mhocko@...e.com>, linux-mm@...ck.org,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [RFC patch 12/41] 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>
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>
---
 mm/page_owner.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/mm/page_owner.c
+++ b/mm/page_owner.c
@@ -148,9 +148,6 @@ static noinline depot_stack_handle_t sav
 	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