linux-kernel - [PATCHv2 16/50] ia64: Add show_stack

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Message-Id: <20200316143916.195608-17-dima@arista.com>
Date:   Mon, 16 Mar 2020 14:38:42 +0000
From:   Dmitry Safonov <dima@...sta.com>
To:     linux-kernel@...r.kernel.org
Cc:     Dmitry Safonov <0x7f454c46@...il.com>,
        Dmitry Safonov <dima@...sta.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ingo Molnar <mingo@...nel.org>, Jiri Slaby <jslaby@...e.com>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Tony Luck <tony.luck@...el.com>, linux-ia64@...r.kernel.org
Subject: [PATCHv2 16/50] ia64: Add show_stack_loglvl()

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: Fenghua Yu <fenghua.yu@...el.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: linux-ia64@...r.kernel.org
[1]: https://lore.kernel.org/lkml/20190528002412.1625-1-dima@arista.com/T/#u
Signed-off-by: Dmitry Safonov <dima@...sta.com>
---
 arch/ia64/kernel/process.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
index 0526cc51ff0b..b0eeb19bdd8d 100644
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -85,18 +85,25 @@ ia64_do_show_stack (struct unw_frame_info *info, void *arg)
 }
 
 void
-show_stack (struct task_struct *task, unsigned long *sp)
+show_stack_loglvl (struct task_struct *task, unsigned long *sp,
+		   const char *loglvl)
 {
 	if (!task)
-		unw_init_running(ia64_do_show_stack, (void *)KERN_DEFAULT);
+		unw_init_running(ia64_do_show_stack, (void *)loglvl);
 	else {
 		struct unw_frame_info info;
 
 		unw_init_from_blocked_task(&info, task);
-		ia64_do_show_stack(&info, (void *)KERN_DEFAULT);
+		ia64_do_show_stack(&info, (void *)loglvl);
 	}
 }
 
+void
+show_stack (struct task_struct *task, unsigned long *sp)
+{
+	show_stack_loglvl(task, sp, KERN_DEFAULT);
+}
+
 void
 show_regs (struct pt_regs *regs)
 {
-- 
2.25.1