false negative in checpatch for asm/ vs. linux/

false negative in checpatch for asm/ vs. linux/

[Nishanth Aravamudan]

Hi Andy,

I think the following:

#warn if <asm/foo.h> is #included and <linux/foo.h> is available (uses RAW line)
                if ($tree && $rawline =~ m{^.\#\s*include\s*\<asm\/(.*)\.h\>}) {
                        my $checkfile = "$root/include/linux/$1.h";
                        if (-f $checkfile && $1 ne 'irq') {
                                WARN("Use #include <linux/$1.h> instead of <asm/$1.h>\n" .
                                        $herecurr);
                        }
                }

in checkpatch.pl can lead to false positives for asm/ includes from within
linux/ files? e.g., I have a patch which moves the asm/hugetlb.h #include up to
the top of include/linux/hugetlb.h, but I get:

[09:46:27]nacc@arkanoid:~/linux/views/linux-2.6-work$ git show HEAD | ./scripts/checkpatch.pl -
WARNING: Use #include <linux/hugetlb.h> instead of <asm/hugetlb.h>
#17: FILE: include/linux/hugetlb.h:8:
+#include <asm/hugetlb.h>

Thanks,
Nish

-- 
Nishanth Aravamudan <nacc@us.ibm.com>
IBM Linux Technology Center

Re: false negative in checpatch for asm/ vs. linux/

[Andy Whitcroft]

On Tue, Apr 29, 2008 at 09:49:18AM -0700, Nishanth Aravamudan wrote:
> Hi Andy,
> 
> I think the following:
> 
> #warn if <asm/foo.h> is #included and <linux/foo.h> is available (uses RAW line)
>                 if ($tree && $rawline =~ m{^.\#\s*include\s*\<asm\/(.*)\.h\>}) {
>                         my $checkfile = "$root/include/linux/$1.h";
>                         if (-f $checkfile && $1 ne 'irq') {
>                                 WARN("Use #include <linux/$1.h> instead of <asm/$1.h>\n" .
>                                         $herecurr);
>                         }
>                 }
> 
> in checkpatch.pl can lead to false positives for asm/ includes from within
> linux/ files? e.g., I have a patch which moves the asm/hugetlb.h #include up to
> the top of include/linux/hugetlb.h, but I get:
> 
> [09:46:27]nacc@arkanoid:~/linux/views/linux-2.6-work$ git show HEAD | ./scripts/checkpatch.pl -
> WARNING: Use #include <linux/hugetlb.h> instead of <asm/hugetlb.h>
> #17: FILE: include/linux/hugetlb.h:8:
> +#include <asm/hugetlb.h>

Yes, clearly stupid and trivial to detect.  Will be sorted in the 0.19.

Thanks for the report.

-apw