public-mirrors/linux
1
0
Fork 0
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-08-05 16:54:27 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

ftrace: Simplify the hash calculation

Browse source 
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>
This commit is contained in:
Steven Rostedt (VMware) 2020-10-05 20:21:14 -04:00
parent 59e65b3358
commit be49313273
1 changed files with 3 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

7
kernel/trace/ftrace.c
View file

@ -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)