Commit 59e65b33 authored Aug 31, 2020 by Wei Yang Committed by Steven Rostedt (VMware) Oct 08, 2020

ftrace: Use fls() to get the bits for dup_hash()

The effect here is to get the number of bits, lets use fls() to do
this job.

Link: https://lkml.kernel.org/r/20200831031104.23322-3-richard.weiyang@linux.alibaba.com



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

parent 8db4d6bf

kernel/trace/ftrace.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -1370,8 +1370,9 @@ static struct ftrace_hash dup_hash(struct ftrace_hash src, int size)
		/*
		* Make the hash size about 1/2 the # found
		*/
		for (size /= 2; size; size >>= 1)
		bits++;
		bits = fls(size);
		if (bits)
		bits--;

		/* Don't allocate too much */
		if (bits > FTRACE_HASH_MAX_BITS)

Admin message