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authorDmitry Safonov <dima@arista.com>2020-06-08 21:30:53 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-09 09:39:11 -0700
commit14b0dd870f6f3b28fad1235b70d1a692db1d6a2f (patch)
tree5f53be8788d996c8e5abc7c84b8bf5a95be03641
parent77530a5277bcab0433d0f68af11e04a5c4d79039 (diff)
downloadlinux-14b0dd870f6f3b28fad1235b70d1a692db1d6a2f.tar.bz2
microblaze: add loglvl to microblaze_unwind()
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 parameter to microblaze_unwind() as a preparation to add show_stack_loglvl(). [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: Michal Simek <monstr@monstr.eu> Link: http://lkml.kernel.org/r/20200418201944.482088-20-dima@arista.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/microblaze/include/asm/unwind.h3
-rw-r--r--arch/microblaze/kernel/stacktrace.c4
-rw-r--r--arch/microblaze/kernel/traps.c2
-rw-r--r--arch/microblaze/kernel/unwind.c6
4 files changed, 8 insertions, 7 deletions
diff --git a/arch/microblaze/include/asm/unwind.h b/arch/microblaze/include/asm/unwind.h
index c327d673622a..3db81777a887 100644
--- a/arch/microblaze/include/asm/unwind.h
+++ b/arch/microblaze/include/asm/unwind.h
@@ -20,7 +20,8 @@ extern struct trap_handler_info microblaze_trap_handlers;
extern const char _hw_exception_handler;
extern const char ex_handler_unhandled;
-void microblaze_unwind(struct task_struct *task, struct stack_trace *trace);
+void microblaze_unwind(struct task_struct *task, struct stack_trace *trace,
+ const char *loglvl);
#endif /* __MICROBLAZE_UNWIND_H */
diff --git a/arch/microblaze/kernel/stacktrace.c b/arch/microblaze/kernel/stacktrace.c
index b4debe283a79..b266c4d6ed9d 100644
--- a/arch/microblaze/kernel/stacktrace.c
+++ b/arch/microblaze/kernel/stacktrace.c
@@ -20,12 +20,12 @@ void save_stack_trace(struct stack_trace *trace)
{
/* Exclude our helper functions from the trace*/
trace->skip += 2;
- microblaze_unwind(NULL, trace);
+ microblaze_unwind(NULL, trace, "");
}
EXPORT_SYMBOL_GPL(save_stack_trace);
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
- microblaze_unwind(tsk, trace);
+ microblaze_unwind(tsk, trace, "");
}
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
diff --git a/arch/microblaze/kernel/traps.c b/arch/microblaze/kernel/traps.c
index 45bbba9d919f..be726ee120fb 100644
--- a/arch/microblaze/kernel/traps.c
+++ b/arch/microblaze/kernel/traps.c
@@ -68,7 +68,7 @@ void show_stack(struct task_struct *task, unsigned long *sp)
print_hex_dump(KERN_INFO, "", DUMP_PREFIX_ADDRESS, 32, 4, (void *)fp,
words_to_show << 2, 0);
pr_info("\n\nCall Trace:\n");
- microblaze_unwind(task, NULL);
+ microblaze_unwind(task, NULL, KERN_INFO);
pr_info("\n");
if (!task)
diff --git a/arch/microblaze/kernel/unwind.c b/arch/microblaze/kernel/unwind.c
index 804bf0c99d8b..778a761af0a7 100644
--- a/arch/microblaze/kernel/unwind.c
+++ b/arch/microblaze/kernel/unwind.c
@@ -287,11 +287,11 @@ static void microblaze_unwind_inner(struct task_struct *task,
* @task : Task whose stack we are to unwind (NULL == current)
* @trace : Where to store stack backtrace (PC values).
* NULL == print backtrace to kernel log
+ * @loglvl : Used for printk log level if (trace == NULL).
*/
-void microblaze_unwind(struct task_struct *task, struct stack_trace *trace)
+void microblaze_unwind(struct task_struct *task, struct stack_trace *trace,
+ const char *loglvl)
{
- const char *loglvl = KERN_INFO;
-
if (task) {
if (task == current) {
const struct pt_regs *regs = task_pt_regs(task);