path: root/arch
diff options
authorDmitry Safonov <dima@arista.com>2020-06-08 21:31:17 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-09 09:39:11 -0700
commit0b3d43657489711bf927998fde82b5cc575d9400 (patch)
tree1e28fd7759193bd7aba0157f36de9bda937aca46 /arch
parentb9677a8cf60995acdd1b36ff59e6b437154bff9e (diff)
riscv: 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: Albert Ou <aou@eecs.berkeley.edu> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Link: http://lkml.kernel.org/r/20200418201944.482088-28-dima@arista.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
1 files changed, 10 insertions, 3 deletions
diff --git a/arch/riscv/kernel/stacktrace.c b/arch/riscv/kernel/stacktrace.c
index 9f1ac258482f..aaa64bf007f8 100644
--- a/arch/riscv/kernel/stacktrace.c
+++ b/arch/riscv/kernel/stacktrace.c
@@ -99,16 +99,23 @@ void notrace walk_stackframe(struct task_struct *task,
static bool print_trace_address(unsigned long pc, void *arg)
- print_ip_sym(KERN_DEFAULT, pc);
+ const char *loglvl = arg;
+ print_ip_sym(loglvl, pc);
return false;
-void show_stack(struct task_struct *task, unsigned long *sp)
+void show_stack_loglvl(struct task_struct *task, unsigned long *sp,
+ const char *loglvl)
pr_cont("Call Trace:\n");
- walk_stackframe(task, NULL, print_trace_address, NULL);
+ walk_stackframe(task, NULL, print_trace_address, (void *)loglvl);
+void show_stack(struct task_struct *task, unsigned long *sp)
+ show_stack_loglvl(task, sp, KERN_DEFAULT);
static bool save_wchan(unsigned long pc, void *arg)