diff options
authorDmitry Safonov <dima@arista.com>2020-06-08 21:31:08 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-09 09:39:11 -0700
commit0633032f083a53cd33f1171cca38c8ba835d1eba (patch)
parent351dd61c3821fe9b6702205d3a894004a9674295 (diff)
openrisc: 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(). [1]: https://lore.kernel.org/lkml/20190528002412.1625-1-dima@arista.com/T/#u Signed-off-by: Dmitry Safonov <dima@arista.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Jonas Bonn <jonas@southpole.se> Cc: Stafford Horne <shorne@gmail.com> Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> Link: http://lkml.kernel.org/r/20200418201944.482088-25-dima@arista.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 files changed, 12 insertions, 4 deletions
diff --git a/arch/openrisc/kernel/traps.c b/arch/openrisc/kernel/traps.c
index c11aa2e17ce0..3b7978a22d68 100644
--- a/arch/openrisc/kernel/traps.c
+++ b/arch/openrisc/kernel/traps.c
@@ -41,18 +41,26 @@ unsigned long __user *lwa_addr;
void print_trace(void *data, unsigned long addr, int reliable)
- pr_emerg("[<%p>] %s%pS\n", (void *) addr, reliable ? "" : "? ",
+ const char *loglvl = data;
+ printk("%s[<%p>] %s%pS\n", loglvl, (void *) addr, reliable ? "" : "? ",
(void *) addr);
/* displays a short stack trace */
-void show_stack(struct task_struct *task, unsigned long *esp)
+void show_stack_loglvl(struct task_struct *task, unsigned long *esp,
+ const char *loglvl)
if (esp == NULL)
esp = (unsigned long *)&esp;
- pr_emerg("Call trace:\n");
- unwind_stack(NULL, esp, print_trace);
+ printk("%sCall trace:\n", loglvl);
+ unwind_stack((void *)loglvl, esp, print_trace);
+void show_stack(struct task_struct *task, unsigned long *esp)
+ show_stack_loglvl(task, esp, KERN_EMERG);
void show_registers(struct pt_regs *regs)