[PATCH v2] devtools: allow variable declaration inside for loop

[Ferruh Yigit <ferruh.yigit@amd.com>]

Declaring variable inside for loop is not supported via C89 and it was
checked in checkpatch.sh via commit [1].
But as DPDK supported C standard is becoming C99/C11 [2], declaring
variable inside loop can be allowed.

[1]
Commit 43e73483a4b8 ("devtools: forbid variable declaration inside for")

[2]
https://dpdk.org/patch/121912

Signed-off-by: Ferruh Yigit <ferruh.yigit@amd.com>
---
Cc: Bruce Richardson <bruce.richardson@intel.com>
Cc: David Marchand <david.marchand@redhat.com>

v2:
 * Update coding convention too
---
 devtools/checkpatches.sh                 | 8 --------
 doc/guides/contributing/coding_style.rst | 1 +
 2 files changed, 1 insertion(+), 8 deletions(-)

diff --git a/devtools/checkpatches.sh b/devtools/checkpatches.sh
index 15d5d6709445..b5baf6f2b161 100755
--- a/devtools/checkpatches.sh
+++ b/devtools/checkpatches.sh
@@ -78,14 +78,6 @@ check_forbidden_additions() { # <patch>
 		-f $(dirname $(readlink -f $0))/check-forbidden-tokens.awk \
 		"$1" || res=1
 
-	# forbid variable declaration inside "for" loop
-	awk -v FOLDERS='.' \
-		-v EXPRESSIONS='for[[:space:]]*\\((char|u?int|unsigned|s?size_t)' \
-		-v RET_ON_FAIL=1 \
-		-v MESSAGE='Declaring a variable inside for()' \
-		-f $(dirname $(readlink -f $0))/check-forbidden-tokens.awk \
-		"$1" || res=1
-
 	# refrain from new additions of 16/32/64 bits rte_atomicNN_xxx()
 	awk -v FOLDERS="lib drivers app examples" \
 		-v EXPRESSIONS="rte_atomic[0-9][0-9]_.*\\\(" \
diff --git a/doc/guides/contributing/coding_style.rst b/doc/guides/contributing/coding_style.rst
index 89db6260cfbf..e18b8d4439ea 100644
--- a/doc/guides/contributing/coding_style.rst
+++ b/doc/guides/contributing/coding_style.rst
@@ -558,6 +558,7 @@ Local Variables
 
 * Variables should be declared at the start of a block of code rather than in the middle.
   The exception to this is when the variable is ``const`` in which case the declaration must be at the point of first use/assignment.
+  Declaring variable inside a for loop is OK.
 * When declaring variables in functions, multiple variables per line are OK.
   However, if multiple declarations would cause the line to exceed a reasonable line length, begin a new set of declarations on the next line rather than using a line continuation.
 * Be careful to not obfuscate the code by initializing variables in the declarations, only the last variable on a line should be initialized.
-- 
2.34.1