Fix $realfile filename when using -f/--file to not remove first level
directory as if the filename was used in a -P1 patch.  Only strip the
first level directory (typically a or b) for P1 patches.

Signed-off-by: Joe Perches <j...@perches.com>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
(extracted from Linux commit 2b7ab45395dc4d91ef30985f76d90a8f28f58c27)
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
 scripts/checkpatch.pl | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 42e1c50..0553634 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1367,10 +1367,10 @@ sub process {
                # extract the filename as it passes
                if ($line =~ /^diff --git.*?(\S+)$/) {
                        $realfile = $1;
-                       $realfile =~ s@^([^/]*)/@@;
+                       $realfile =~ s@^([^/]*)/@@ if (!$file);
                } elsif ($line =~ /^\+\+\+\s+(\S+)/) {
                        $realfile = $1;
-                       $realfile =~ s@^([^/]*)/@@;
+                       $realfile =~ s@^([^/]*)/@@ if (!$file);
 
                        $p1_prefix = $1;
                        if (!$file && $tree && $p1_prefix ne '' &&
-- 
1.8.3.1



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