linux-kernel - [PATCH] x86/xen: move declaration/definition of xen_processor

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Message-Id: <20230321112522.46806-1-roger.pau@citrix.com>
Date:   Tue, 21 Mar 2023 12:25:21 +0100
From:   Roger Pau Monne <roger.pau@...rix.com>
To:     linux-kernel@...r.kernel.org
Cc:     xen-devel@...ts.xenproject.org, rafael@...nel.org,
        Roger Pau Monne <roger.pau@...rix.com>,
        kernel test robot <lkp@...el.com>,
        Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
Subject: [PATCH] x86/xen: move declaration/definition of xen_processor_present()

So that it doesn't break the build when CONFIG_XEN or CONFIG_XEN_DOM0
are not enabled.

The current header is only included when CONFIG_XEN_DOM0 is selected,
so instead place it in the top level xen.h header, and also use the
dummy helper when CONFIG_X86 is not selected, as the current
implementation is x86 only.

Reported-by: kernel test robot <lkp@...el.com>
Link: https://lore.kernel.org/oe-kbuild-all/202303210729.DvRvIUla-lkp@intel.com/
Signed-off-by: Roger Pau Monné <roger.pau@...rix.com>
---
 arch/x86/include/asm/xen/hypervisor.h | 10 ----------
 include/xen/xen.h                     | 10 ++++++++++
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/x86/include/asm/xen/hypervisor.h b/arch/x86/include/asm/xen/hypervisor.h
index 990a1609677e..5fc35f889cd1 100644
--- a/arch/x86/include/asm/xen/hypervisor.h
+++ b/arch/x86/include/asm/xen/hypervisor.h
@@ -63,14 +63,4 @@ void __init xen_pvh_init(struct boot_params *boot_params);
 void __init mem_map_via_hcall(struct boot_params *boot_params_p);
 #endif
 
-#if defined(CONFIG_XEN_DOM0) && defined(CONFIG_ACPI)
-bool __init xen_processor_present(uint32_t acpi_id);
-#else
-static inline bool xen_processor_present(uint32_t acpi_id)
-{
-	BUG();
-	return false;
-}
-#endif
-
 #endif /* _ASM_X86_XEN_HYPERVISOR_H */
diff --git a/include/xen/xen.h b/include/xen/xen.h
index 7adf59837c25..4410e74f3eb5 100644
--- a/include/xen/xen.h
+++ b/include/xen/xen.h
@@ -71,4 +71,14 @@ static inline void xen_free_unpopulated_pages(unsigned int nr_pages,
 }
 #endif
 
+#if defined(CONFIG_XEN_DOM0) && defined(CONFIG_ACPI) && defined(CONFIG_X86)
+bool __init xen_processor_present(uint32_t acpi_id);
+#else
+static inline bool xen_processor_present(uint32_t acpi_id)
+{
+	BUG();
+	return false;
+}
+#endif
+
 #endif	/* _XEN_XEN_H */
-- 
2.40.0