linux-kernel - Re: [PATCH v2 4/6] vfio/type1: Use consistent types for page counts

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Message-ID: <Z7UNsiRfdOWfZWuq@x1.local>
Date: Tue, 18 Feb 2025 17:46:10 -0500
From: Peter Xu <peterx@...hat.com>
To: Alex Williamson <alex.williamson@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	mitchell.augustin@...onical.com, clg@...hat.com, jgg@...dia.com
Subject: Re: [PATCH v2 4/6] vfio/type1: Use consistent types for page counts

On Tue, Feb 18, 2025 at 03:22:04PM -0700, Alex Williamson wrote:
> Page count should more consistently be an unsigned long when passed as
> an argument while functions returning a number of pages should use a
> signed long to allow for -errno.
> 
> vaddr_get_pfns() can therefore be upgraded to return long, though in
> practice it's currently limited by the batch capacity.  In fact, the
> batch indexes are noted to never hold negative values, so while it
> doesn't make sense to bloat the structure with unsigned longs in this
> case, it does make sense to specify these as unsigned.
> 
> No change in behavior expected.
> 
> Signed-off-by: Alex Williamson <alex.williamson@...hat.com>

Reviewed-by: Peter Xu <peterx@...hat.com>

-- 
Peter Xu