seq_file optimization?

[Joe Perches]

About this commit in mm:

---------------------------------------------------
commit c1aca87fb3f84a813fb3dda656bbee583c9c87a3
Author: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Date:   Fri Jun 30 11:02:04 2017 +1000

    fs/seq_file.c: delete small-value optimization
    
    num_to_str() optimizes printing small integers [0..9], so the same check
    higher in callchain is unnecessary.
---------------------------------------------------

Is removing this optimization really the same speed?

I don't think so.

The num_to_str call still does multiple moves of
memory to the output, this is a single byte copy.