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| author |   Wei Yang <richard.weiyang@linux.alibaba.com> | 2020-08-31 11:11:00 +0800 |
|---|---|---|
| committer |   Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-10-08 15:29:06 -0400 |
| commit | 59e65b3358f44d4d0134eca3b6c269f359f21cd5 (patch) | |
| tree | e874d9cc9d84a563d4dc87cfad0159c3796c71a3 /kernel/trace/ftrace.c | |
| parent | tracing: Change synthetic event string format to limit printed length (diff) | |
| download | linux-dev-59e65b3358f44d4d0134eca3b6c269f359f21cd5.tar.xz linux-dev-59e65b3358f44d4d0134eca3b6c269f359f21cd5.zip | |
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>
Diffstat (limited to 'kernel/trace/ftrace.c')
| -rw-r--r-- | kernel/trace/ftrace.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 123d520b9261..5633d37d8806 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -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) |