[PATCH] checkpatch: Remove missing switch/case break test

[Joe Perches]

This test doesn't work well and newer compilers are much better
at emitting this warning.

Signed-off-by: Joe Perches <j...@perches.com>
---
> 在 2020年8月1日，02:05，Joe Perches <j...@perches.com> 写道：
> > On Wed, 2020-07-29 at 20:59 +0800, Cambda Zhu wrote:
> > > The checkpatch.pl only searches 3 previous lines when finding missing
> > > switch/case break, and macros are treated as normal statements. If the
> > > cases are surrounded with CONFIG, checkpatch.pl may report false
> > > warnings. For example:
> > 
> > Likely this test should be removed altogether as
> > it's never really worked well and now compilers
> > find this and emit warnings.

 scripts/checkpatch.pl | 25 -------------------------
 1 file changed, 25 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index cc5542cc234f..4aa1d9d5e62c 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -6541,31 +6541,6 @@ sub process {
                        }
                }
 
-# check for case / default statements not preceded by break/fallthrough/switch
-               if ($line =~ 
/^.\s*(?:case\s+(?:$Ident|$Constant)\s*|default):/) {
-                       my $has_break = 0;
-                       my $has_statement = 0;
-                       my $count = 0;
-                       my $prevline = $linenr;
-                       while ($prevline > 1 && ($file || $count < 3) && 
!$has_break) {
-                               $prevline--;
-                               my $rline = $rawlines[$prevline - 1];
-                               my $fline = $lines[$prevline - 1];
-                               last if ($fline =~ /^\@\@/);
-                               next if ($fline =~ /^\-/);
-                               next if ($fline =~ 
/^.(?:\s*(?:case\s+(?:$Ident|$Constant)[\s$;]*|default):[\s$;]*)*$/);
-                               $has_break = 1 if ($rline =~ 
/fall[\s_-]*(through|thru)/i);
-                               next if ($fline =~ /^.[\s$;]*$/);
-                               $has_statement = 1;
-                               $count++;
-                               $has_break = 1 if ($fline =~ 
/\bswitch\b|\b(?:break\s*;[\s$;]*$|exit\s*\(\b|return\b|goto\b|continue\b)/);
-                       }
-                       if (!$has_break && $has_statement) {
-                               WARN("MISSING_BREAK",
-                                    "Possible switch case/default not preceded 
by break or fallthrough comment\n" . $herecurr);
-                       }
-               }
-
 # check for /* fallthrough */ like comment, prefer fallthrough;
                my @fallthroughs = (
                        'fallthrough',