On Sun, 24 Nov 2019 23:38:41 -0500 "Frank A. Cancio Bello" <frank@xxxxxxxxxxxxxxxxxxxxxx> wrote: > --- a/Documentation/trace/ring-buffer-design.txt > +++ b/Documentation/trace/ring-buffer-design.txt > @@ -37,7 +37,7 @@ commit_page - a pointer to the page with the last finished non-nested write. > > cmpxchg - hardware-assisted atomic transaction that performs the following: > > - A = B iff previous A == C > + A = B if previous A == C This wasn't a typo. "iff" means "if and only if" which is a standard notation. That is, this is shorthand for: A = B if previous A == C previous A == C if A = B -- Steve > > R = cmpxchg(A, C, B) is saying that we replace A with B if and only if > current A is equal to C, and we put the old (current) A into R > --
