Re: [Linux-kernel-mentees] [PATCH] checkpatch: fix false positive for REPEATED_WORD warning

[Joe Perches <joe@perches.com>]

On Wed, 2020-10-21 at 12:26 -0700, Joe Perches wrote:

> Perhaps a regex for permissions is good enough
> 	$line !~ /\b[cbdl-][rwxs-]{9,9}\b/

Maybe not completely correct...

From info ls:

    The file type is one of the following characters:

     ‘-’
          regular file
     ‘b’
          block special file
     ‘c’
          character special file
     ‘C’
          high performance (“contiguous data”) file
     ‘d’
          directory
     ‘D’
          door (Solaris 2.5 and up)
     ‘l’
          symbolic link
     ‘M’
          off-line (“migrated”) file (Cray DMF)
     ‘n’
          network special file (HP-UX)
     ‘p’
          FIFO (named pipe)
     ‘P’
          port (Solaris 10 and up)
     ‘s’
          socket
     ‘?’
          some other file type

     The file mode bits listed are similar to symbolic mode
     specifications (*note Symbolic Modes::).  But ‘ls’ combines
     multiple bits into the third character of each set of permissions
     as follows:

     ‘s’
          If the set-user-ID or set-group-ID bit and the corresponding
          executable bit are both set.

     ‘S’
          If the set-user-ID or set-group-ID bit is set but the
          corresponding executable bit is not set.

     ‘t’
          If the restricted deletion flag or sticky bit, and the
          other-executable bit, are both set.  The restricted deletion
          flag is another name for the sticky bit.  *Note Mode
          Structure::.

     ‘T’
          If the restricted deletion flag or sticky bit is set but the
          other-executable bit is not set.

     ‘x’
          If the executable bit is set and none of the above apply.

     ‘-’
          Otherwise.

So apparently to be correct this should be:

	$line !~ /\b[bcCdDlMnpPs\?-][rwxsStT-]{9,9}\b/


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