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[PATCH 02/14] x86/bitops: don't cast away volatile-ness
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 2 Sep 2026 08:30:49 +0200
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- Cc: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Roger Pau Monné <roger@xxxxxxxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- Delivery-date: Wed, 02 Sep 2026 06:30:55 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Doing so, besides being a bad idea in general, violates Misra rule 11.8.
Use the helper macro we have available anyway.
No functional change intended.
Fixes: f1879b2c2584 ("xen: introduce generic non-atomic test_*bit()")
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/arch/x86/include/asm/bitops.h
+++ b/xen/arch/x86/include/asm/bitops.h
@@ -188,7 +188,7 @@ static inline int arch__test_and_set_bit
asm volatile ( "btsl %[nr], %[addr]\n\t"
ASM_FLAG_OUT(, "sbbl %[old], %[old]\n\t")
: [old] ASM_FLAG_OUT("=@ccc", "=r") (oldbit),
- [addr] "+m" (*(int *)addr) : [nr] "Ir" (nr) : "memory" );
+ [addr] "+m" (ADDR) : [nr] "Ir" (nr) : "memory" );
return oldbit;
}
@@ -234,7 +234,7 @@ static inline int arch__test_and_clear_b
asm volatile ( "btrl %[nr], %[addr]\n\t"
ASM_FLAG_OUT(, "sbbl %[old], %[old]\n\t")
: [old] ASM_FLAG_OUT("=@ccc", "=r") (oldbit),
- [addr] "+m" (*(int *)addr) : [nr] "Ir" (nr) : "memory" );
+ [addr] "+m" (ADDR) : [nr] "Ir" (nr) : "memory" );
return oldbit;
}
@@ -248,7 +248,7 @@ static inline int arch__test_and_change_
asm volatile ( "btcl %[nr], %[addr]\n\t"
ASM_FLAG_OUT(, "sbbl %[old], %[old]\n\t")
: [old] ASM_FLAG_OUT("=@ccc", "=r") (oldbit),
- [addr] "+m" (*(int *)addr) : [nr] "Ir" (nr) : "memory" );
+ [addr] "+m" (ADDR) : [nr] "Ir" (nr) : "memory" );
return oldbit;
}
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