ftrace: Simplify the calculation of page number for ftrace_page->records

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Based on the following two reasones, we could simplify the calculation:

  - If the number after roundup count is not power of 2, we would
    definitely have more than 1 empty page with a higher order.
  - get_count_order() just return current order, so one lower order
    could meet the requirement.

The calculation could be simplified by lower one order level when pages
are not power of 2.

Link: https://lkml.kernel.org/r/20200831031104.23322-5-richard.weiyang@linux.alibaba.com

Signed-off-by: Wei Yang <richard.weiyang@linux.alibaba.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

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Wei Yang 2020-08-31 11:11:02 +08:00 • committed by Steven Rostedt (VMware)

parent 02dae28f0b

commit b40c6eabfc

1 changed files with 4 additions and 3 deletions

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kernel/trace/ftrace.c

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