From: Dmitry Safonov <dima@xxxxxxxxxx> Subject: nios2: 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@xxxxxxxxxx/T/#u Link: http://lkml.kernel.org/r/20200418201944.482088-24-dima@xxxxxxxxxx Signed-off-by: Dmitry Safonov <dima@xxxxxxxxxx> Cc: Ley Foon Tan <lftan@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- arch/nios2/kernel/traps.c | 23 +++++++++++++++-------- 1 file changed, 15 insertions(+), 8 deletions(-) --- a/arch/nios2/kernel/traps.c~nios2-add-show_stack_loglvl +++ a/arch/nios2/kernel/traps.c @@ -52,12 +52,14 @@ void _exception(int signo, struct pt_reg } /* - * The show_stack is an external API which we do not use ourselves. + * The show_stack(), show_stack_loglvl() are external API + * which we do not use ourselves. */ int kstack_depth_to_print = 48; -void show_stack(struct task_struct *task, unsigned long *stack) +void show_stack_loglvl(struct task_struct *task, unsigned long *stack, + const char *loglvl) { unsigned long *endstack, addr; int i; @@ -72,16 +74,16 @@ void show_stack(struct task_struct *task addr = (unsigned long) stack; endstack = (unsigned long *) PAGE_ALIGN(addr); - pr_emerg("Stack from %08lx:", (unsigned long)stack); + printk("%sStack from %08lx:", loglvl, (unsigned long)stack); for (i = 0; i < kstack_depth_to_print; i++) { if (stack + 1 > endstack) break; if (i % 8 == 0) - pr_emerg("\n "); - pr_emerg(" %08lx", *stack++); + printk("%s\n ", loglvl); + printk("%s %08lx", loglvl, *stack++); } - pr_emerg("\nCall Trace:"); + printk("%s\nCall Trace:", loglvl); i = 0; while (stack + 1 <= endstack) { addr = *stack++; @@ -97,11 +99,16 @@ void show_stack(struct task_struct *task (addr <= (unsigned long) _etext))) { if (i % 4 == 0) pr_emerg("\n "); - pr_emerg(" [<%08lx>]", addr); + printk("%s [<%08lx>]", loglvl, addr); i++; } } - pr_emerg("\n"); + printk("%s\n", loglvl); +} + +void show_stack(struct task_struct *task, unsigned long *stack) +{ + show_stack_loglvl(task, stack, KERN_EMERG); } void __init trap_init(void) _
