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

Commit b40c6eabfcd40 ("ftrace: Simplify the calculation of page number for
ftrace_page->records") simplified the calculation of the number of pages
needed for each page group without having any empty pages, but it can be
simplified even further.

Link: https://lore.kernel.org/lkml/CAHk-=wjt9b7kxQ2J=aDNKbR1QBMB3Hiqb_hYcZbKsxGRSEb+gQ@mail.gmail.com/
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index f7bef5a..057e962 100644 (file)
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -3156,15 +3156,9 @@ static int ftrace_allocate_records(struct ftrace_page *pg, int count)
        if (WARN_ON(!count))
                return -EINVAL;
 
+       /* We want to fill as much as possible, with no empty pages */
        pages = DIV_ROUND_UP(count, ENTRIES_PER_PAGE);
-       order = get_count_order(pages);
-
-       /*
-        * We want to fill as much as possible. No more than a page
-        * may be empty.
-        */
-       if (!is_power_of_2(pages))
-               order--;
+       order = fls(pages) - 1;
 
  again:
        pg->records = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, order);