From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751754AbeERGrR (ORCPT ); Fri, 18 May 2018 02:47:17 -0400 Received: from mx2.suse.de ([195.135.220.15]:32947 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750957AbeERGrP (ORCPT ); Fri, 18 May 2018 02:47:15 -0400 From: Jiri Slaby To: mingo@redhat.com Cc: linux-kernel@vger.kernel.org, Jiri Slaby , Thomas Gleixner , "H. Peter Anvin" , x86@kernel.org, Josh Poimboeuf Subject: [PATCH v3 2/6] x86/stacktrace: remove STACKTRACE_DUMP_ONCE Date: Fri, 18 May 2018 08:47:09 +0200 Message-Id: <20180518064713.26440-2-jslaby@suse.cz> X-Mailer: git-send-email 2.16.3 In-Reply-To: <20180518064713.26440-1-jslaby@suse.cz> References: <20180518064713.26440-1-jslaby@suse.cz> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The stack unwinding can sometimes fail yet. Especially with the generated debug info. So do not yell at users -- live patching (the only user of this interface) will inform the user about the failure gracefully. And given this was the only user of the macro, remove the macro proper too. [v3] remove also the macro Signed-off-by: Jiri Slaby Cc: Thomas Gleixner Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: x86@kernel.org Cc: Josh Poimboeuf --- arch/x86/kernel/stacktrace.c | 18 ++---------------- 1 file changed, 2 insertions(+), 16 deletions(-) diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c index 8948b7d9c064..f9dacf6d4667 100644 --- a/arch/x86/kernel/stacktrace.c +++ b/arch/x86/kernel/stacktrace.c @@ -81,16 +81,6 @@ EXPORT_SYMBOL_GPL(save_stack_trace_tsk); #ifdef CONFIG_HAVE_RELIABLE_STACKTRACE -#define STACKTRACE_DUMP_ONCE(task) ({ \ - static bool __section(.data.unlikely) __dumped; \ - \ - if (!__dumped) { \ - __dumped = true; \ - WARN_ON(1); \ - show_stack(task, NULL); \ - } \ -}) - static int __always_inline __save_stack_trace_reliable(struct stack_trace *trace, struct task_struct *task) @@ -123,20 +113,16 @@ __save_stack_trace_reliable(struct stack_trace *trace, * generated code which __kernel_text_address() doesn't know * about. */ - if (!addr) { - STACKTRACE_DUMP_ONCE(task); + if (!addr) return -EINVAL; - } if (save_stack_address(trace, addr, false)) return -EINVAL; } /* Check for stack corruption */ - if (unwind_error(&state)) { - STACKTRACE_DUMP_ONCE(task); + if (unwind_error(&state)) return -EINVAL; - } if (trace->nr_entries < trace->max_entries) trace->entries[trace->nr_entries++] = ULONG_MAX; -- 2.16.3