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[PATCH 3/4] x86/P2M: split a read_atomic() invocation
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 21 May 2026 17:16:11 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>
- Delivery-date: Thu, 21 May 2026 15:16:18 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Misra C:2012 rule 13.6 takes issue with pfn_to_pdx() and mfn_x() uses
(deep) inside sizeof(), as used by read_atomic(). Break out the MFN ->
struct page_info * translation.
No difference in generated code, except for a line number change.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -1332,6 +1332,7 @@ int set_shared_p2m_entry(struct domain *
p2m_access_t a;
p2m_type_t ot;
mfn_t omfn;
+ const struct page_info *pg;
unsigned long pg_type;
if ( !paging_mode_translate(p2m->domain) )
@@ -1345,7 +1346,8 @@ int set_shared_p2m_entry(struct domain *
ASSERT(mfn_valid(omfn));
/* Set the m2p entry to invalid only if there are no further type
* refs to this page as shared */
- pg_type = read_atomic(&(mfn_to_page(omfn)->u.inuse.type_info));
+ pg = mfn_to_page(omfn);
+ pg_type = read_atomic(&pg->u.inuse.type_info);
if ( (pg_type & PGT_count_mask) == 0
|| (pg_type & PGT_type_mask) != PGT_shared_page )
set_gpfn_from_mfn(mfn_x(omfn), INVALID_M2P_ENTRY);
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