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tracing: Remove outdated comment in stack handling

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This comment describes the behaviour before commit 2a820bf749
("tracing: Use percpu stack trace buffer more intelligently").  Since
that commit, interrupts and NMIs do use the per-cpu stacks so the
comment is no longer correct.  Remove it.

(Note that the FTRACE_STACK_SIZE mentioned in the comment has never
existed, it probably should have said FTRACE_STACK_ENTRIES.)

Link: https://lkml.kernel.org/r/20200727092840.18659-1-vincent.whitchurch@axis.com

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Vincent Whitchurch 2020-07-27 11:28:40 +02:00 committed by Steven Rostedt (VMware)
parent c5f51572a7
commit ee896ee805
1 changed files with 0 additions and 6 deletions
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6
kernel/trace/trace.c
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@ -2930,12 +2930,6 @@ static void __ftrace_trace_stack(struct trace_buffer *buffer,
skip++; skip++;
#endif #endif
/*
* Since events can happen in NMIs there's no safe way to
* use the per cpu ftrace_stacks. We reserve it and if an interrupt
* or NMI comes in, it will just have to use the default
* FTRACE_STACK_SIZE.
*/
preempt_disable_notrace(); preempt_disable_notrace();
stackidx = __this_cpu_inc_return(ftrace_stack_reserve) - 1; stackidx = __this_cpu_inc_return(ftrace_stack_reserve) - 1;