Messages in this thread Patch in this message | | | From | Dmitry Safonov <> | Subject | [PATCHv2 42/50] xtensa: Add loglvl to show_trace() | Date | Mon, 16 Mar 2020 14:39:08 +0000 |
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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().
Cc: Chris Zankel <chris@zankel.net> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: linux-xtensa@linux-xtensa.org [1]: https://lore.kernel.org/lkml/20190528002412.1625-1-dima@arista.com/T/#u Signed-off-by: Dmitry Safonov <dima@arista.com> --- arch/xtensa/kernel/traps.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c index 0976e27b8d5d..c397a02457bc 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); } #define STACK_DUMP_ENTRY_SIZE 4 @@ -511,7 +515,7 @@ void show_stack(struct task_struct *task, unsigned long *sp) print_hex_dump(KERN_INFO, " ", DUMP_PREFIX_NONE, STACK_DUMP_LINE_SIZE, STACK_DUMP_ENTRY_SIZE, sp, len, false); - show_trace(task, sp); + show_trace(task, stack, KERN_INFO); } DEFINE_SPINLOCK(die_lock); -- 2.25.1
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