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[PATCH 12/14] gnttab: don't cast away constness
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 2 Sep 2026 08:35:47 +0200
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- Cc: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>
- Delivery-date: Wed, 02 Sep 2026 06:35:52 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
While _set_status_v2() indeed doesn't alter the grant_entry_header_t it
is handed a pointer to, _set_status_v1() does. Drop the const from the
parameter of the latter (and then necessarily also from _set_status()'s),
while adding const to the local variable of the former.
No functional change.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
Really I think it would be best if we did away with the raw_shah local
variables (which looks reasonably simple for at least _set_status_v2()).
I'm unconvinced that we really need to use ACCESS_ONCE() here. Torn reads
aren't a problem; what we require is that we look at a stable local copy,
and that can be achieved by putting barrier() after the reads.
--- a/xen/common/grant_table.c
+++ b/xen/common/grant_table.c
@@ -740,7 +740,7 @@ static unsigned int nr_grant_entries(str
return 0;
}
-static int _set_status_v1(const grant_entry_header_t *shah,
+static int _set_status_v1(grant_entry_header_t *shah,
struct domain *rd,
struct active_grant_entry *act,
int readonly,
@@ -832,7 +832,7 @@ static int _set_status_v2(const grant_en
domid_t ldomid)
{
int rc = GNTST_okay;
- uint32_t *raw_shah = (uint32_t *)shah;
+ const uint32_t *raw_shah = (const uint32_t *)shah;
union grant_combo scombo;
uint16_t mask = GTF_type_mask;
@@ -909,7 +909,7 @@ done:
}
-static int _set_status(const grant_entry_header_t *shah,
+static int _set_status(grant_entry_header_t *shah,
grant_status_t *status,
struct domain *rd,
unsigned int rgt_version,
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