Re: [PATCH] vfio: pci: use kzalloc_flex
From: Gustavo A. R. Silva
Date: Mon Mar 30 2026 - 19:48:22 EST
On 3/30/26 17:24, Rosen Penev wrote:
On Mon, Mar 30, 2026 at 4:16 PM Alex Williamson <alex@xxxxxxxxxxx> wrote:
Yes that one. My understanding is __counted_by mandates immediate
[Cc +Leon]
On Wed, 25 Mar 2026 19:37:47 -0700
Rosen Penev <rosenp@xxxxxxxxx> wrote:
Simplify allocation by using a flexible array member and kzalloc_flex.
Less memory management needed.
Use __counted_by for extra runtime analysis. Move assignment to after
allocation as required by __counted_by.
I don't understand this statement, nr_ranges was previously set after
the allocation of phys_vec. The only reordering was relative to
setting vdev, but that appears arbitrary.
assignment after allocation. Otherwise UBSAN complains.
Not true. However, it's best practice.
The requirement is that the _counter_ must be initialized before
the first reference to the flexible-array member.
-Gustavo