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| author |   Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-10-05 20:21:14 -0400 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-10-08 15:29:06 -0400 |
| commit | be49313273211c47d1b317d6b2dbe02637c2794c (patch) | |
| tree | 0387632d4bf0911a626e423e6c2abcc445069a55 /kernel/trace/ftrace.c | |
| parent | ftrace: Use fls() to get the bits for dup_hash() (diff) | |
| download | linux-dev-be49313273211c47d1b317d6b2dbe02637c2794c.tar.xz linux-dev-be49313273211c47d1b317d6b2dbe02637c2794c.zip | |
ftrace: Simplify the hash calculation
No need to add a check to subtract the number of bits if bits is zero after
fls(). Just divide the size by two before calling it. This does give the
same answer for size of 0 and 1, but that's fine.
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/ftrace.c')
| -rw-r--r-- | kernel/trace/ftrace.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 5633d37d8806..c51a91aea1fd 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -1368,11 +1368,10 @@ static struct ftrace_hash *dup_hash(struct ftrace_hash *src, int size) int i; /* - * Make the hash size about 1/2 the # found + * Use around half the size (max bit of it), but + * a minimum of 2 is fine (as size of 0 or 1 both give 1 for bits). */ - bits = fls(size); - if (bits) - bits--; + bits = fls(size / 2); /* Don't allocate too much */ if (bits > FTRACE_HASH_MAX_BITS) |