[xen staging] x86/p2m: Short-circuit p2m_is_altp2m() when CONFIG_ALTP2M=n

[patchbot@xxxxxxx]

commit 58443f14b395d4a700ebbd3a37340f1d345620bb
Author:     Petr Beneš <w1benny@xxxxxxxxx>
AuthorDate: Wed Jul 23 15:22:24 2025 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Jul 23 15:22:24 2025 +0200

    x86/p2m: Short-circuit p2m_is_altp2m() when CONFIG_ALTP2M=n
    
    Wrap the p2m_is_altp2m() check with IS_ENABLED(CONFIG_ALTP2M) to allow the
    compiler to short-circuit the condition at build time when ALTP2M is 
disabled.
    
    Signed-off-by: Petr Beneš <w1benny@xxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/include/asm/p2m.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/include/asm/p2m.h b/xen/arch/x86/include/asm/p2m.h
index 4358cc15a2..58b56e575e 100644
--- a/xen/arch/x86/include/asm/p2m.h
+++ b/xen/arch/x86/include/asm/p2m.h
@@ -437,7 +437,7 @@ static inline bool p2m_is_nestedp2m(const struct p2m_domain 
*p2m)
 
 static inline bool p2m_is_altp2m(const struct p2m_domain *p2m)
 {
-    return p2m->p2m_class == p2m_alternate;
+    return IS_ENABLED(CONFIG_ALTP2M) && p2m->p2m_class == p2m_alternate;
 }
 
 #ifdef CONFIG_HVM
--
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