aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorSteven Rostedt (Google) <[email protected]>2024-06-12 19:19:47 -0400
committerSteven Rostedt (Google) <[email protected]>2024-06-14 12:28:22 -0400
commita62b4f6fbdffa8e90959da485b68f844241d300f (patch)
tree07b31abd67655529964a11b567620c474888c869
parent7cfeb9033dd1fbdaacd74b2e6613d7366f515e16 (diff)
tracing: Add last boot delta offset for stack traces
The addresses of a stack trace event are relative to the kallsyms. As that can change between boots, when printing the stack trace from a buffer that was from the last boot, it needs all the addresses to be added to the "text_delta" that gives the delta between the addresses of the functions for the current boot compared to the address of the last boot. Then it can be passed to kallsyms to find the function name, otherwise it just shows a useless list of addresses. Link: https://lkml.kernel.org/r/[email protected] Cc: Masami Hiramatsu <[email protected]> Cc: Mark Rutland <[email protected]> Cc: Mathieu Desnoyers <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Vincent Donnefort <[email protected]> Cc: Joel Fernandes <[email protected]> Cc: Daniel Bristot de Oliveira <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Vineeth Pillai <[email protected]> Cc: Youssef Esmat <[email protected]> Cc: Beau Belgrave <[email protected]> Cc: Alexander Graf <[email protected]> Cc: Baoquan He <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: "Paul E. McKenney" <[email protected]> Cc: David Howells <[email protected]> Cc: Mike Rapoport <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Tony Luck <[email protected]> Cc: Guenter Roeck <[email protected]> Cc: Ross Zwisler <[email protected]> Cc: Kees Cook <[email protected]> Signed-off-by: Steven Rostedt (Google) <[email protected]>
-rw-r--r--kernel/trace/trace_output.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index b9d2c64c0648..48de93598897 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -1233,6 +1233,7 @@ static enum print_line_t trace_stack_print(struct trace_iterator *iter,
struct trace_seq *s = &iter->seq;
unsigned long *p;
unsigned long *end;
+ long delta = iter->tr->text_delta;
trace_assign_type(field, iter->ent);
end = (unsigned long *)((long)iter->ent + iter->ent_size);
@@ -1245,7 +1246,7 @@ static enum print_line_t trace_stack_print(struct trace_iterator *iter,
break;
trace_seq_puts(s, " => ");
- seq_print_ip_sym(s, *p, flags);
+ seq_print_ip_sym(s, (*p) + delta, flags);
trace_seq_putc(s, '\n');
}