linux-kernel - Re: [RFC/PATCH] Update coding standard to avoid ungrepable printk format strings

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Date:	Sat, 23 Feb 2008 13:55:32 +0100
From:	Christer Weinigel <christer@...nigel.se>
To:	Andi Kleen <andi@...stfloor.org>
CC:	linux-kernel@...r.kernel.org, torvalds@...l.org
Subject: Re: [RFC/PATCH] Update coding standard to avoid ungrepable printk
 format strings

Andi Kleen wrote:
> RFC: Update coding standard to avoid split up printk format strings

While we're talking about checkpatch.pl, I'd definitely like to teach 
checkpatch about "list_for_each" and friends.

list_for_each is flow control, not a function call.  I find it much 
easier to see that something is a loop when there is a space between the 
name and the parenthesis rather than when they are smashed together.

old patch follows

   /Christer

checkpatch complains about the following:

WARNING: no space between function name and open parenthesis '('
#520: FILE: drivers/spi/spi_s3c24xx_dma.c:478:
+       list_for_each_entry (transfer, &message->transfers, transfer_list) {

which I think is a bit bogus since it actually is a for statement in
disguise.  The following patch adds list_for_each to the list of things
that look like functions that it shouldn't complain about.

Index: linux-2.6.23/scripts/checkpatch.pl
===================================================================
--- linux-2.6.23.orig/scripts/checkpatch.pl
+++ linux-2.6.23/scripts/checkpatch.pl
@@ -681,7 +681,7 @@ sub process {

  # check for spaces between functions and their parentheses.
  		if ($line =~ /($Ident)\s+\(/ &&
-		    $1 !~ 
/^(?:if|for|while|switch|return|volatile|__volatile__|__attribute__|format|__extension__|Copyright)$/ 
&&
+		    $1 !~ 
/^(?:if|for|while|switch|list_for_each.*|return|volatile|__volatile__|__attribute__|format|__extension__|Copyright)$/ 
&&
  		    $line !~ /$Type\s+\(/ && $line !~ /^.\#\s*define\b/) {
  			WARN("no space between function name and open parenthesis '('\n" . 
$herecurr);
  		}
--
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