linux-kernel - Re: [PATCH] gve: Fix the size used in a 'dma_free

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Date:   Mon, 3 Aug 2020 21:19:26 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Jakub Kicinski <kuba@...nel.org>, Joe Perches <joe@...ches.com>
Cc:     csully@...gle.com, sagis@...gle.com, jonolson@...gle.com,
        davem@...emloft.net, lrizzo@...gle.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] gve: Fix the size used in a 'dma_free_coherent()' call

Le 03/08/2020 à 17:41, Jakub Kicinski a écrit :
> On Sun,  2 Aug 2020 16:15:23 +0200 Christophe JAILLET wrote:
>> Update the size used in 'dma_free_coherent()' in order to match the one
>> used in the corresponding 'dma_alloc_coherent()'.
>>
>> Fixes: 893ce44df5 ("gve: Add basic driver framework for Compute Engine Virtual NIC")
>> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> 
> Fixes tag: Fixes: 893ce44df5 ("gve: Add basic driver framework for Compute Engine Virtual NIC")
> Has these problem(s):
> 	- SHA1 should be at least 12 digits long
> 	  Can be fixed by setting core.abbrev to 12 (or more) or (for git v2.11
> 	  or later) just making sure it is not set (or set to "auto").
> 

Hi,

I have git 2.25.1 and core.abbrev is already 12, both in my global 
.gitconfig and in the specific .git/gitconfig of my repo.

I would have expected checkpatch to catch this kind of small issue.
Unless I do something wrong, it doesn't.

Joe, does it make sense to you and would one of the following patch help?

If I understand the regex correctly, I guess that checkpatch should 
already spot such things. If correct, proposal 1 fix a bug.
If I'm wrong, proposal 2 adds a new test.

CJ



Proposal #1 : find what looks like a commit number, with 5+ char 
(instead of 12+), before looking if it is looks like a standard layout 
with expected length
===========
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index cc5542cc234f..f42b6a65f5c1 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2828,7 +2828,7 @@ sub process {
                     $line !~ 
/^\s*(?:Link|Patchwork|http|https|BugLink|base-commit):/i &&
                     $line !~ /^This reverts commit [0-9a-f]{7,40}/ &&
                     ($line =~ /\bcommit\s+[0-9a-f]{5,}\b/i ||
-                    ($line =~ /(?:\s|^)[0-9a-f]{12,40}(?:[\s"'\(\[]|$)/i &&
+                    ($line =~ /(?:\s|^)[0-9a-f]{5,40}(?:[\s"'\(\[]|$)/i &&
                       $line !~ /[\<\[][0-9a-f]{12,40}[\>\]]/i &&
                       $line !~ /\bfixes:\s*[0-9a-f]{12,40}/i))) {
                         my $init_char = "c";




Proposal #2 : add a specific and explicit check
===========
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index cc5542cc234f..13ecfbd38af3 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2989,6 +2989,12 @@ sub process {
                         }
                 }

+# check for too short commit id
+               if ($in_commit_log && $line =~ 
/(^fixes:|\bcommit)\s+([0-9a-f]{0,11})\b/i) {
+                               WARN("TOO_SHORT_COMMIT_ID",
+                                    "\"$1\" tag should be at least 12 
chars long. $2 is only " . length($2) . " long\n" . $herecurr);
+               }
+
  # ignore non-hunk lines and lines being removed
                 next if (!$hunk_line || $line =~ /^-/);