On Wed, Jun 03, 2020 at 06:47:13PM -0700, Joe Perches wrote:

On Wed, 2020-06-03 at 18:40 -0700, Kees Cook wrote:

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On Wed, Jun 03, 2020 at 05:02:29PM -0700, Joe Perches wrote:

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On Wed, 2020-06-03 at 16:32 -0700, Kees Cook wrote:

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Using uninitialized_var() is dangerous as it papers over real bugs[1]
(or can in the future), and suppresses unrelated compiler warnings
(e.g. "unused variable"). If the compiler thinks it is uninitialized,
either simply initialize the variable or make compiler changes.

In preparation for removing[2] the[3] macro[4], effectively revert
commit 16b7f3c89907 ("checkpatch: avoid warning about uninitialized_var()")
and remove all remaining mentions of uninitialized_var().

[1] https://lore.kernel.org/lkml/20200603174714.192027-1-glider@google.com/ (local)
[2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@mail.gmail.com/ (local)
[3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com/ (local)
[4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/ (local)

nack.  see below.

I'd prefer a simple revert, but it shouldn't
be done here.

What do you mean? (I can't understand this and "fine by me" below?)

I did write "other than that"...

I mean that the original commit fixed 2 issues,
one with the uninitialized_var addition, and
another with the missing void function declaration.

I think I found the missing void function bit because
the uninitialized_var use looked like a function so I
fixed both things at the same time.

If you change it, please just remove the bit that
checks for uninitialized_var.

Ah! Gotcha. Thanks; I will update it.

-Kees

Thanks, Joe

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diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl

[]

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@@ -4075,7 +4074,7 @@ sub process {
 		}
 
 # check for function declarations without arguments like "int foo()"
-		if ($line =~ /(\b$Type\s*$Ident)\s*\(\s*\)/) {
+		if ($line =~ /(\b$Type\s+$Ident)\s*\(\s*\)/) {

This isn't right because $Type includes a possible trailing *
where there isn't a space between $Type and $Ident

Ah, hm, that was changed in the mentioned commit:

-               if ($line =~ /(\b$Type\s+$Ident)\s*\(\s*\)/) {
+               if ($line =~ /(\b$Type\s*$Ident)\s*\(\s*\)/) {

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e.g.:	int *bar(void);

Other than that, fine by me...

Thanks for looking it over! I'll adjust it however you'd like. :)

-- 
Kees Cook