path: root/arch
diff options
authorDmitry Safonov <dima@arista.com>2020-06-08 21:32:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-09 09:39:12 -0700
commit47fb70294976cb1ea110f4fc01ae1bc2f450933a (patch)
treef543fe94c0b731fe715243311d03abcc2f1c6285 /arch
parenta832ff02244e36da0bf4bb3a1aec0ce9a23b0bad (diff)
xtensa: add loglvl to show_trace()
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. Add log level argument to show_trace() as a preparation for introducing show_stack_loglvl(). [1]: https://lore.kernel.org/lkml/20190528002412.1625-1-dima@arista.com/T/#u [rppt@kernel.org: build fix] Link: http://lkml.kernel.org/r/20200511194534.GA1018386@kernel.org Signed-off-by: Dmitry Safonov <dima@arista.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Chris Zankel <chris@zankel.net> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Mike Rapoport <rppt@kernel.org> Link: http://lkml.kernel.org/r/20200418201944.482088-43-dima@arista.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
1 files changed, 9 insertions, 5 deletions
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index 0976e27b8d5d..5013b62a9943 100644
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -479,18 +479,22 @@ void show_regs(struct pt_regs * regs)
static int show_trace_cb(struct stackframe *frame, void *data)
+ const char *loglvl = data;
if (kernel_text_address(frame->pc))
- pr_cont(" [<%08lx>] %pB\n", frame->pc, (void *)frame->pc);
+ printk("%s [<%08lx>] %pB\n",
+ loglvl, frame->pc, (void *)frame->pc);
return 0;
-void show_trace(struct task_struct *task, unsigned long *sp)
+static void show_trace(struct task_struct *task, unsigned long *sp,
+ const char *loglvl)
if (!sp)
sp = stack_pointer(task);
- pr_info("Call Trace:\n");
- walk_stackframe(sp, show_trace_cb, NULL);
+ printk("%sCall Trace:\n", loglvl);
+ walk_stackframe(sp, show_trace_cb, (void *)loglvl);
@@ -511,7 +515,7 @@ void show_stack(struct task_struct *task, unsigned long *sp)
print_hex_dump(KERN_INFO, " ", DUMP_PREFIX_NONE,
sp, len, false);
- show_trace(task, sp);
+ show_trace(task, sp, KERN_INFO);