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References: <20240221092728.1281499-1-davidgow@google.com> <20240221092728.1281499-3-davidgow@google.com>
 <20240221201008.ez5tu7xvkedtln3o@google.com>
In-Reply-To: <20240221201008.ez5tu7xvkedtln3o@google.com>
From: David Gow <davidgow@google.com>
Date: Thu, 22 Feb 2024 14:22:10 +0800
Message-ID: <CABVgOSn+VxTb5TOmZd82HN04j_ZG9J2G-AoJmdxWG8QDh9xGxg@mail.gmail.com>
Subject: Re: [PATCH 2/9] lib/cmdline: Fix an invalid format specifier in an
 assertion msg
To: Justin Stitt <justinstitt@google.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>, Shuah Khan <skhan@linuxfoundation.org>, 
	Guenter Roeck <linux@roeck-us.net>, Rae Moar <rmoar@google.com>, 
	Matthew Auld <matthew.auld@intel.com>, 
	Arunpravin Paneer Selvam <arunpravin.paneerselvam@amd.com>, 
	=?UTF-8?Q?Christian_K=C3=B6nig?= <christian.koenig@amd.com>, 
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	Javier Martinez Canillas <javierm@redhat.com>, Arthur Grillo <arthur.grillo@usp.br>, 
	Brendan Higgins <brendan.higgins@linux.dev>, Daniel Latypov <dlatypov@google.com>, 
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On Thu, 22 Feb 2024 at 04:10, 'Justin Stitt' via KUnit Development
<kunit-dev@googlegroups.com> wrote:
>
> Hi,
>
> On Wed, Feb 21, 2024 at 05:27:15PM +0800, David Gow wrote:
> > The correct format specifier for p - n (both p and n are pointers) is
> > %td, as the type should be ptrdiff_t.
>
> I think %tu is better. d specifies a signed type. I don't doubt that the
> warning is fixed but I think %tu represents the type semantics here.
>

While I agree that this should never be negative, I'd still lean on
this being a signed type, for two reasons:
- I think, if there's a bug in this code, it's easier to debug this if
a 'negative' value were to appear as such.
- While, as I understand it, the C spec does provide for a
ptrdiff_t-sized unsigned printf specifier in '%tu', the difference
between two pointers is always signed:

"When two pointers are subtracted, both shall point to elements of the
same array object,
or one past the last element of the array object; the result is the
difference of the
subscripts of the two array elements. The size of the result is
implementation-defined,
and its type (a signed integer type) is ptrdiff_t defined in the
<stddef.h> header"

(Technically, the kernel's ptrdiff_t type isn't defined in stddef.h,
so a bit of deviation from the spec is happening anyway, though.)

If there's a particularly good reason to make this unsigned in this
case, I'd be happy to change it, of course. But I'd otherwise prefer
to keep it as-is.

Cheers,
-- David

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