Re: [PATCH][next] nfsd: Replace one-element array with flexible-array member

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On 5/23/23 19:01, Chuck Lever wrote:
On Tue, May 23, 2023 at 06:44:23PM -0600, Gustavo A. R. Silva wrote:
One-element arrays are deprecated, and we are replacing them with
flexible array members instead. So, replace a one-element array
with a flexible-arrayº member in struct vbi_anc_data and refactor

I don't know what "struct vbi_anc_data" is. Is the patch description
correct?

Oops, copy/paste error. I'll fix it up. :)



the rest of the code, accordingly.

This results in no differences in binary output.

Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/298
Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>

---
  fs/nfsd/nfs4callback.c | 2 +-
  fs/nfsd/xdr4.h         | 2 +-
  2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/nfsd/nfs4callback.c b/fs/nfsd/nfs4callback.c
index 4039ffcf90ba..2c688d51135d 100644
--- a/fs/nfsd/nfs4callback.c
+++ b/fs/nfsd/nfs4callback.c
@@ -353,7 +353,7 @@ encode_cb_recallany4args(struct xdr_stream *xdr,
  {
  	encode_nfs_cb_opnum4(xdr, OP_CB_RECALL_ANY);
  	encode_uint32(xdr, ra->ra_keep);
-	encode_bitmap4(xdr, ra->ra_bmval, ARRAY_SIZE(ra->ra_bmval));
+	encode_bitmap4(xdr, ra->ra_bmval, 1);

I find the new code less self-documenting.


  	hdr->nops++;
  }
diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h
index 510978e602da..68072170eac8 100644
--- a/fs/nfsd/xdr4.h
+++ b/fs/nfsd/xdr4.h
@@ -899,7 +899,7 @@ struct nfsd4_operation {
  struct nfsd4_cb_recall_any {
  	struct nfsd4_callback	ra_cb;
  	u32			ra_keep;
-	u32			ra_bmval[1];
+	u32			ra_bmval[];

This is not a placeholder for "1 or more elements". We actually want
just a single u32 element in this array. Doesn't this change the
sizeof(struct nfsd4_cb_recall_any) ?

I see. Yes, it does change the size. Can we replace it with a simple
object of type u32? or do you actually need this to stay an array?

Thanks
--
Gustav



  };
#endif
--
2.34.1




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