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Re: [PATCH v2] xen/public: fix flexible array definitions
- To: Julien Grall <julien@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Thu, 30 Nov 2023 12:39:05 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Thu, 30 Nov 2023 11:39:10 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 30.11.23 12:33, Julien Grall wrote:
Hi Juergen,
On 30/11/2023 09:21, Juergen Gross wrote:
---
V2:
- bump interface version and make change only for new version
(Jan Beulich)
---
xen/include/public/io/cameraif.h | 2 +-
xen/include/public/io/displif.h | 2 +-
xen/include/public/io/fsif.h | 4 ++--
xen/include/public/io/pvcalls.h | 2 +-
xen/include/public/io/ring.h | 5 +++--
xen/include/public/io/sndif.h | 2 +-
xen/include/public/xen-compat.h | 2 +-
xen/include/public/xen.h | 6 ++++++
8 files changed, 16 insertions(+), 9 deletions(-)
diff --git a/xen/include/public/io/cameraif.h b/xen/include/public/io/cameraif.h
index 13763abef9..a389443769 100644
--- a/xen/include/public/io/cameraif.h
+++ b/xen/include/public/io/cameraif.h
@@ -763,7 +763,7 @@ struct xencamera_buf_create_req {
*/
struct xencamera_page_directory {
grant_ref_t gref_dir_next_page;
- grant_ref_t gref[1]; /* Variable length */
+ grant_ref_t gref[XENPV_FLEX_ARRAY_DIM];
};
/*
diff --git a/xen/include/public/io/displif.h b/xen/include/public/io/displif.h
index 73d0cbdf15..132c96fa5c 100644
--- a/xen/include/public/io/displif.h
+++ b/xen/include/public/io/displif.h
@@ -537,7 +537,7 @@ struct xendispl_dbuf_create_req {
struct xendispl_page_directory {
grant_ref_t gref_dir_next_page;
- grant_ref_t gref[1]; /* Variable length */
+ grant_ref_t gref[XENPV_FLEX_ARRAY_DIM];
};
/*
diff --git a/xen/include/public/io/fsif.h b/xen/include/public/io/fsif.h
index ec57850233..dcade1c698 100644
--- a/xen/include/public/io/fsif.h
+++ b/xen/include/public/io/fsif.h
@@ -40,7 +40,7 @@ struct fsif_read_request {
int32_t pad;
uint64_t len;
uint64_t offset;
- grant_ref_t grefs[1]; /* Variable length */
+ grant_ref_t grefs[XENPV_FLEX_ARRAY_DIM];
};
struct fsif_write_request {
@@ -48,7 +48,7 @@ struct fsif_write_request {
int32_t pad;
uint64_t len;
uint64_t offset;
- grant_ref_t grefs[1]; /* Variable length */
+ grant_ref_t grefs[XENPV_FLEX_ARRAY_DIM];
};
struct fsif_stat_request {
diff --git a/xen/include/public/io/pvcalls.h b/xen/include/public/io/pvcalls.h
index 230b0719e3..af0e9abd13 100644
--- a/xen/include/public/io/pvcalls.h
+++ b/xen/include/public/io/pvcalls.h
@@ -30,7 +30,7 @@ struct pvcalls_data_intf {
uint8_t pad2[52];
RING_IDX ring_order;
- grant_ref_t ref[];
+ grant_ref_t ref[XENPV_FLEX_ARRAY_DIM];
I am probably missing something. In the commit message, you suggested that
XENPV_FLEX_ARRAY_DIM will use 1 for older interface version for compatibility
reason.
Yet, if I am not mistaken, [] is not equivalent to [1]. So aren't you
effectively breaking the compatibility?
Oh, thanks for catching this one!
I agree, this should be XEN_FLEX_ARRAY_DIM instead.
Juergen
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