From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: x86@kernel.org, Russell King <linux@armlinux.org.uk>,
Steven Rostedt <rostedt@goodmis.org>,
Alexander Potapenko <glider@google.com>,
Andy Lutomirski <luto@kernel.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
linux-arm-kernel@lists.infradead.org
Subject: [RFC patch 03/41] arm/stacktrace: Remove the pointless ULONG_MAX marker
Date: Wed, 10 Apr 2019 12:27:57 +0200 [thread overview]
Message-ID: <20190410103643.843075256@linutronix.de> (raw)
In-Reply-To: 20190410102754.387743324@linutronix.de
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@linutronix.de>
Cc: Russell King <linux@armlinux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org
---
arch/arm/kernel/stacktrace.c | 6 ------
1 file changed, 6 deletions(-)
--- a/arch/arm/kernel/stacktrace.c
+++ b/arch/arm/kernel/stacktrace.c
@@ -115,8 +115,6 @@ static noinline void __save_stack_trace(
* running on another CPU? For now, ignore it as we
* can't guarantee we won't explode.
*/
- if (trace->nr_entries < trace->max_entries)
- trace->entries[trace->nr_entries++] = ULONG_MAX;
return;
#else
frame.fp = thread_saved_fp(tsk);
@@ -134,8 +132,6 @@ static noinline void __save_stack_trace(
}
walk_stackframe(&frame, save_trace, &data);
- if (trace->nr_entries < trace->max_entries)
- trace->entries[trace->nr_entries++] = ULONG_MAX;
}
void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
@@ -153,8 +149,6 @@ void save_stack_trace_regs(struct pt_reg
frame.pc = regs->ARM_pc;
walk_stackframe(&frame, save_trace, &data);
- if (trace->nr_entries < trace->max_entries)
- trace->entries[trace->nr_entries++] = ULONG_MAX;
}
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
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next parent reply other threads:[~2019-04-10 11:05 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190410102754.387743324@linutronix.de>
2019-04-10 10:27 ` Thomas Gleixner [this message]
2019-04-10 10:28 ` [RFC patch 07/41] arm64/stacktrace: Remove the pointless ULONG_MAX marker Thomas Gleixner
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