linux-kernel - RE: [PATCH 34/36] tty: gdm724x: convert counts to size

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Date:   Wed, 16 Aug 2023 08:40:59 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Jiri Slaby' <jirislaby@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-staging@...ts.linux.dev" <linux-staging@...ts.linux.dev>
Subject: RE: [PATCH 34/36] tty: gdm724x: convert counts to size_t

From: Jiri Slaby
> Sent: Wednesday, August 16, 2023 7:47 AM
> 
> On 15. 08. 23, 19:22, Nathan Chancellor wrote:
> > On Thu, Aug 10, 2023 at 11:15:08AM +0200, Jiri Slaby (SUSE) wrote:
> >> Unify the type of tty_operations::write() counters with the 'count'
> >> parameter. I.e. use size_t for them.
> >>
> >> This includes changing constants to UL to keep min() and avoid min_t().
> >
> > This patch appears to cause a warning/error on 32-bit architectures now
> > due to this part of the change, as size_t is 'unsigned int' there:
> 
> Right, this is my brain fart thinking ulong is the same as size_t
> everywhere. No, size_t is uint on 32bit.
> 
> I will fix this -- kernel build bot seems to be slow -- it didn't find
> the issue out in my queue, nor in tty-testing.

'Vote up' my patches to minmax.h that make this all work.
Then it won't care provided both values have the same signedness.
(or, with patch 5, are non-negative 31bit compile time constants.)

Pretty much the only other patch is casting the constants to (size_t).

	David

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