[RFC v2 2/2] docs: ftrace: Fix typos

[Frank A. Cancio Bello]

Fix minor typos in the doc.

Signed-off-by: Frank A. Cancio Bello <frank@xxxxxxxxxxxxxxxxxxxxxx>
---
 Documentation/trace/ftrace.rst             | 6 +++---
 Documentation/trace/ring-buffer-design.txt | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/Documentation/trace/ftrace.rst b/Documentation/trace/ftrace.rst
index 2b21068ebf8e..9e7b45485ea1 100644
--- a/Documentation/trace/ftrace.rst
+++ b/Documentation/trace/ftrace.rst
@@ -236,7 +236,7 @@ of ftrace. Here is a list of some of the key files:
 	This interface also allows for commands to be used. See the
 	"Filter commands" section for more details.
 
-	As a speed up, since processing strings can't be quite expensive
+	As a speed up, since processing strings can be quite expensive
 	and requires a check of all functions registered to tracing, instead
 	an index can be written into this file. A number (starting with "1")
 	written will instead select the same corresponding at the line position
@@ -383,7 +383,7 @@ of ftrace. Here is a list of some of the key files:
 
 	By default, 128 comms are saved (see "saved_cmdlines" above). To
 	increase or decrease the amount of comms that are cached, echo
-	in a the number of comms to cache, into this file.
+	in the number of comms to cache, into this file.
 
   saved_tgids:
 
@@ -3325,7 +3325,7 @@ directories after it is created.
 
 As you can see, the new directory looks similar to the tracing directory
 itself. In fact, it is very similar, except that the buffer and
-events are agnostic from the main director, or from any other
+events are agnostic from the main directory, or from any other
 instances that are created.
 
 The files in the new directory work just like the files with the
diff --git a/Documentation/trace/ring-buffer-design.txt b/Documentation/trace/ring-buffer-design.txt
index ff747b6fa39b..2d53c6f25b91 100644
--- 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
 
    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
-- 
2.17.1