Disable warning about volatile variables. They are oftne needed in embedded code

checkpatch.pl

@@ -5329,10 +5329,10 @@ sub process {
 
 # no volatiles please
 		my $asm_volatile = qr{\b(__asm__|asm)\s+(__volatile__|volatile)\b};
-		if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) {
-			WARN("VOLATILE",
-			     "Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst\n" . $herecurr);
-		}
+		#if ($line =~ /\bvolatile\b/ && $line !~ /$asm_volatile/) {
+		#	WARN("VOLATILE",
+		#	     "Use of volatile is usually wrong: see Documentation/process/volatile-considered-harmful.rst\n" . $herecurr);
+		#}
 
 # Check for user-visible strings broken across lines, which breaks the ability
 # to grep for the string.  Make exceptions when the previous string ends in a