From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56518 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1728551AbgDRUUa (ORCPT ); Sat, 18 Apr 2020 16:20:30 -0400 Received: from mail-wr1-x444.google.com (mail-wr1-x444.google.com [IPv6:2a00:1450:4864:20::444]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8BFAAC061A0C for ; Sat, 18 Apr 2020 13:20:29 -0700 (PDT) Received: by mail-wr1-x444.google.com with SMTP id u13so7187519wrp.3 for ; Sat, 18 Apr 2020 13:20:29 -0700 (PDT) From: Dmitry Safonov Subject: [PATCHv3 28/50] s390: Add show_stack_loglvl() Date: Sat, 18 Apr 2020 21:19:22 +0100 Message-Id: <20200418201944.482088-29-dima@arista.com> In-Reply-To: <20200418201944.482088-1-dima@arista.com> References: <20200418201944.482088-1-dima@arista.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-s390-owner@vger.kernel.org List-ID: To: linux-kernel@vger.kernel.org Cc: Dmitry Safonov <0x7f454c46@gmail.com>, Dmitry Safonov , Andrew Morton , Greg Kroah-Hartman , Ingo Molnar , Jiri Slaby , Petr Mladek , Sergey Senozhatsky , Steven Rostedt , Tetsuo Handa , Christian Borntraeger , Heiko Carstens , Vasily Gorbik , linux-s390@vger.kernel.org Currently, the log-level of show_stack() depends on a platform realization. It creates situations where the headers are printed with lower log level or higher than the stacktrace (depending on a platform or user). Furthermore, it forces the logic decision from user to an architecture side. In result, some users as sysrq/kdb/etc are doing tricks with temporary rising console_loglevel while printing their messages. And in result it not only may print unwanted messages from other CPUs, but also omit printing at all in the unlucky case where the printk() was deferred. Introducing log-level parameter and KERN_UNSUPPRESSED [1] seems an easier approach than introducing more printk buffers. Also, it will consolidate printings with headers. Introduce show_stack_loglvl(), that eventually will substitute show_stack(). Cc: Christian Borntraeger Cc: Heiko Carstens Cc: Vasily Gorbik Cc: linux-s390@vger.kernel.org [1]: https://lore.kernel.org/lkml/20190528002412.1625-1-dima@arista.com/T/#u Signed-off-by: Dmitry Safonov --- arch/s390/kernel/dumpstack.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/arch/s390/kernel/dumpstack.c b/arch/s390/kernel/dumpstack.c index 2c122d8bab93..887a054919fc 100644 --- a/arch/s390/kernel/dumpstack.c +++ b/arch/s390/kernel/dumpstack.c @@ -126,18 +126,24 @@ int get_stack_info(unsigned long sp, struct task_struct *task, return -EINVAL; } -void show_stack(struct task_struct *task, unsigned long *stack) +void show_stack_loglvl(struct task_struct *task, unsigned long *stack, + const char *loglvl) { struct unwind_state state; - printk("Call Trace:\n"); + printk("%sCall Trace:\n", loglvl); unwind_for_each_frame(&state, task, NULL, (unsigned long) stack) - printk(state.reliable ? " [<%016lx>] %pSR \n" : - "([<%016lx>] %pSR)\n", - state.ip, (void *) state.ip); + printk(state.reliable ? "%s [<%016lx>] %pSR \n" : + "%s([<%016lx>] %pSR)\n", + loglvl, state.ip, (void *) state.ip); debug_show_held_locks(task ? : current); } +void show_stack(struct task_struct *task, unsigned long *stack) +{ + show_stack_loglvl(task, stack, KERN_DEFAULT); +} + static void show_last_breaking_event(struct pt_regs *regs) { printk("Last Breaking-Event-Address:\n"); -- 2.26.0