linux-kernel - [tip:core/stacktrace] riscv/stacktrace: Remove the pointless ULONG

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Message-ID: <tip-fa9833992d5ff3c0d6e81d708bec363bce2fb54c@git.kernel.org>
Date:   Sun, 14 Apr 2019 13:37:34 -0700
From:   tip-bot for Thomas Gleixner <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     luto@...nel.org, palmer@...ive.com, aou@...s.berkeley.edu,
        jpoimboe@...hat.com, hpa@...or.com, glider@...gle.com,
        peterz@...radead.org, mingo@...nel.org, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, rostedt@...dmis.org
Subject: [tip:core/stacktrace] riscv/stacktrace: Remove the pointless
 ULONG_MAX marker

Commit-ID:  fa9833992d5ff3c0d6e81d708bec363bce2fb54c
Gitweb:     https://git.kernel.org/tip/fa9833992d5ff3c0d6e81d708bec363bce2fb54c
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Wed, 10 Apr 2019 12:28:00 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Sun, 14 Apr 2019 19:58:28 +0200

riscv/stacktrace: Remove the pointless ULONG_MAX marker

Terminating the last trace entry with ULONG_MAX is a completely pointless
exercise and none of the consumers can rely on it because it's
inconsistently implemented across architectures. In fact quite some of the
callers remove the entry and adjust stack_trace.nr_entries afterwards.

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: linux-riscv@...ts.infradead.org
Cc: Palmer Dabbelt <palmer@...ive.com>
Cc: Albert Ou <aou@...s.berkeley.edu>
Link: https://lkml.kernel.org/r/20190410103644.131061192@linutronix.de

---
 arch/riscv/kernel/stacktrace.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/riscv/kernel/stacktrace.c b/arch/riscv/kernel/stacktrace.c
index a4b1d94371a0..4d403274c2e8 100644
--- a/arch/riscv/kernel/stacktrace.c
+++ b/arch/riscv/kernel/stacktrace.c
@@ -169,8 +169,6 @@ static bool save_trace(unsigned long pc, void *arg)
 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
 {
 	walk_stackframe(tsk, NULL, save_trace, trace);
-	if (trace->nr_entries < trace->max_entries)
-		trace->entries[trace->nr_entries++] = ULONG_MAX;
 }
 EXPORT_SYMBOL_GPL(save_stack_trace_tsk);