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[v2,7/7] checkpatch: suggest _BITULL() and _BITUL() for UAPI headers

Message ID 20210521085849.37676-8-joerichey94@gmail.com (mailing list archive)
State New, archived
Headers show
Series [v2,1/7] x86/elf: Use _BITUL() macro in UAPI headers | expand

Commit Message

Joe Richey May 21, 2021, 8:58 a.m. UTC 
From: Joe Richey <joerichey@google.com>

Instead of just ignoring UAPI headers, reccomend the UAPI compatible
macros if a user adds something that looks like (1 << n). Normal kernel
code will continue to get BIT_ULL() and BIT() reccomended.

This change also modifies the $realfile regex to match headers that have
"include/uapi" anywhere in their path so paths like:
    tools/include/uapi/linux/kvm.h
    arch/x86/include/uapi/asm/hwcap2.h
get recognized as UAPI headers.

Signed-off-by: Joe Richey <joerichey@google.com>
---
 scripts/checkpatch.pl | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

Comments

Joe Perches May 21, 2021, 2:45 p.m. UTC | #1 
On Fri, 2021-05-21 at 01:58 -0700, Joe Richey wrote:
> From: Joe Richey <joerichey@google.com>
> 
> Instead of just ignoring UAPI headers, reccomend the UAPI compatible
> macros if a user adds something that looks like (1 << n). Normal kernel
> code will continue to get BIT_ULL() and BIT() reccomended.
> 
> This change also modifies the $realfile regex to match headers that have
> "include/uapi" anywhere in their path so paths like:
>     tools/include/uapi/linux/kvm.h
>     arch/x86/include/uapi/asm/hwcap2.h
> get recognized as UAPI headers.
[]
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
[]
> @@ -7020,15 +7020,17 @@ sub process {
>  			}
>  		}
>  
> 
> -# check for #defines like: 1 << <digit> that could be BIT(digit), it is not exported to uapi
> -		if ($realfile !~ m@^include/uapi/@ &&
> -		    $line =~ /#\s*define\s+\w+\s+\(?\s*1\s*([ulUL]*)\s*\<\<\s*(?:\d+|$Ident)\s*\)?/) {
> -			my $ull = "";
> -			$ull = "_ULL" if (defined($1) && $1 =~ /ll/i);
> +# check for #defines like: 1 << <digit> that could be BIT(digit) or similar
> +		if ($line =~ /#\s*define\s+\w+\s+\(?\s*1\s*([ulUL]*)\s*\<\<\s*(?:\d+|$Ident)\s*\)?/) {
> +			my $ull = (defined($1) && $1 =~ /ll/i);
> +			my $macroname = $ull ? "BIT_ULL" : "BIT";
> +			if ($realfile =~ m@include/uapi/@) {

Likely better with \b
			if ($realfile =~ m@\binclude/uapi/@) {

> +				$macroname = $ull ? "_BITULL" : "_BITUL";
> +			}
>  			if (CHK("BIT_MACRO",
> -				"Prefer using the BIT$ull macro\n" . $herecurr) &&
> +				"Prefer using the $macroname macro\n" . $herecurr) &&
>  			    $fix) {
> -				$fixed[$fixlinenr] =~ s/\(?\s*1\s*[ulUL]*\s*<<\s*(\d+|$Ident)\s*\)?/BIT${ull}($1)/;
> +				$fixed[$fixlinenr] =~ s/\(?\s*1\s*[ulUL]*\s*<<\s*(\d+|$Ident)\s*\)?/${macroname}($1)/;

Doesn't need braces
				$fixed[$fixlinenr] =~ s/\(?\s*1\s*[ulUL]*\s*<<\s*(\d+|$Ident)\s*\)?/$macroname($1)/;

Otherwise, fine by me.
diff mbox series

Patch

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index d65334588eb4..47edc61b74c2 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -7020,15 +7020,17 @@  sub process {
 			}
 		}
 
-# check for #defines like: 1 << <digit> that could be BIT(digit), it is not exported to uapi
-		if ($realfile !~ m@^include/uapi/@ &&
-		    $line =~ /#\s*define\s+\w+\s+\(?\s*1\s*([ulUL]*)\s*\<\<\s*(?:\d+|$Ident)\s*\)?/) {
-			my $ull = "";
-			$ull = "_ULL" if (defined($1) && $1 =~ /ll/i);
+# check for #defines like: 1 << <digit> that could be BIT(digit) or similar
+		if ($line =~ /#\s*define\s+\w+\s+\(?\s*1\s*([ulUL]*)\s*\<\<\s*(?:\d+|$Ident)\s*\)?/) {
+			my $ull = (defined($1) && $1 =~ /ll/i);
+			my $macroname = $ull ? "BIT_ULL" : "BIT";
+			if ($realfile =~ m@include/uapi/@) {
+				$macroname = $ull ? "_BITULL" : "_BITUL";
+			}
 			if (CHK("BIT_MACRO",
-				"Prefer using the BIT$ull macro\n" . $herecurr) &&
+				"Prefer using the $macroname macro\n" . $herecurr) &&
 			    $fix) {
-				$fixed[$fixlinenr] =~ s/\(?\s*1\s*[ulUL]*\s*<<\s*(\d+|$Ident)\s*\)?/BIT${ull}($1)/;
+				$fixed[$fixlinenr] =~ s/\(?\s*1\s*[ulUL]*\s*<<\s*(\d+|$Ident)\s*\)?/${macroname}($1)/;
 			}
 		}