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[PATCH 3/4] Eclair: relax "noreturn" function-pointer conversion deviation
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 3 Sep 2026 13:44:06 +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: Thu, 03 Sep 2026 11:44:10 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Like misra/rules.rst says, function arguments other than "void *" are okay
as well.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
I can't explain why this covers the violation in mce.c:mce_callbacks'es
initializer, but not the one in mce.c:default_handler's.
As a result of 6852334f8416 ("Arm/GIC: add noreturn in a few more
places"), vgic_v2_lpi_to_pending() and vgic_v2_lpi_get_priority() (both
returning non-void) would also need covering. (As said in a remark there,
non-void together with noreturn is somewhat odd.)
Really before and after this change there's no checking that parameter and
return types actually match. I have no clue how one would express such
checks.
--- a/automation/eclair_analysis/ECLAIR/deviations.ecl
+++ b/automation/eclair_analysis/ECLAIR/deviations.ecl
@@ -391,11 +391,11 @@ constant expressions are required.\""
}
-doc_end
--doc_begin="The conversion from 'void noreturn (*)(void *)' to 'void (*)(void
*)' is safe
+-doc_begin="The conversion from 'void noreturn (*)(...)' to 'void (*)(...)' is
safe
because the semantics of the 'noreturn' attribute do not alter the calling
convention or behavior of the resulting code."
-config=MC3A2.R11.1,casts+={safe,
- "kind(bitcast)&&to(type(pointer(inner(return(builtin(void))&&all_param(1,
pointer(builtin(void)))))))&&from(expr(skip(!syntactic(),
- ref(property(noreturn)))))"}
+
"kind(bitcast)&&to(type(pointer(inner(return(builtin(void))))))&&from(expr(skip(!syntactic(),ref(property(noreturn)))))"
+}
-doc_end
-doc_begin="The conversion from a pointer to an incomplete type to unsigned
long does not lose any information, provided that the target type has enough
bits to store it."
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