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tracing/perf: Add interrupt_context_level() helper

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Now that there are three different instances of doing the addition trick
to the preempt_count() and NMI_MASK, HARDIRQ_MASK and SOFTIRQ_OFFSET
macros, it deserves a helper function defined in the preempt.h header.

Add the interrupt_context_level() helper and replace the three instances
that do that logic with it.

Link: https://lore.kernel.org/all/20211015142541.4badd8a9@gandalf.local.home/

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware)
2021-10-15 15:01:19 -04:00
parent 9b84fadc44
commit 91ebe8bcbf
4 changed files with 24 additions and 18 deletions
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7
include/linux/trace_recursion.h
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@@ -136,12 +136,7 @@ enum {
static __always_inline int trace_get_context_bit(void)
{
unsigned long pc = preempt_count();
unsigned char bit = 0;
bit += !!(pc & (NMI_MASK));
bit += !!(pc & (NMI_MASK | HARDIRQ_MASK));
bit += !!(pc & (NMI_MASK | HARDIRQ_MASK | SOFTIRQ_OFFSET));
unsigned char bit = interrupt_context_level();
return TRACE_CTX_NORMAL - bit;
}