Re: [RFC PATCH v3] RDMA/siw: use kzalloc_flex

[Bernard Metzler <bernard.metzler@linux.dev>]

On 13.05.2026 19:45, Leon Romanovsky wrote:
> 
> On Mon, 11 May 2026 16:11:49 +0200, bernard.metzler@linux.dev wrote:
>> Simplify umem allocation by using flexible array member.
>> Add __counted_by to get extra runtime analysis.
> 
> Applied, thanks!
> 
> [1/1] RDMA/siw: use kzalloc_flex
>        https://git.kernel.org/rdma/rdma/c/79678bea399052
> 
> Best regards,
Hi Leon,

per Jason's suggestion, please amend the patch by
adding below line. We should NOT assume kzalloc_flex
to initialize anything but 0. So we shall set
umem->num_chunks explicitly.

Many thanks,
Bernard.
----

diff --git a/drivers/infiniband/sw/siw/siw_mem.c b/drivers/infiniband/sw/siw/siw_mem.c
index 88ec3cacfa00..40455616d9ec 100644
--- a/drivers/infiniband/sw/siw/siw_mem.c
+++ b/drivers/infiniband/sw/siw/siw_mem.c
@@ -359,6 +359,7 @@ struct siw_umem *siw_umem_get(struct ib_device *base_dev, u64 start,
	umem->fp_addr = first_page_va;
	umem->base_mem = base_mem;
	umem->num_pages = num_pages;
+	umem->num_chunks = num_chunks;

	sgt = &base_mem->sgt_append.sgt;
	__sg_page_iter_start(&sg_iter, sgt->sgl, sgt->orig_nents, 0);