tracing: Remove the ULONG_MAX stack trace hackery

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No architecture terminates the stack trace with ULONG_MAX anymore. As the
code checks the number of entries stored anyway there is no point in
keeping all that ULONG_MAX magic around.

The histogram code zeroes the storage before saving the stack, so if the
trace is shorter than the maximum number of entries it can terminate the
print loop if a zero entry is detected.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Alexander Potapenko <glider@google.com>
Link: https://lkml.kernel.org/r/20190410103645.048761764@linutronix.de

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This commit is contained in:

Thomas Gleixner 2019-04-10 12:28:10 +02:00

parent fa49e2eac9

commit 4285f2fcef

2 changed files with 6 additions and 16 deletions

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2

kernel/trace/trace_events_hist.c

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20

kernel/trace/trace_stack.c

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