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Subject[PATCH v2 17/21] x86/xen: create stubs for HVM-only builds in page.h
Date
__pfn_to_mfn() is only used from PV code (mmu_pv.c, p2m.c) and from
page.h where all functions calling it check for
xen_feature(XENFEAT_auto_translated_physmap) first so we can replace
it with any stub to make build happy.

set_foreign_p2m_mapping()/clear_foreign_p2m_mapping() are used from
grant-table.c but only if !xen_feature(XENFEAT_auto_translated_physmap).

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/include/asm/xen/page.h | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)

diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
index 33cbd3d..0bf4bb34 100644
--- a/arch/x86/include/asm/xen/page.h
+++ b/arch/x86/include/asm/xen/page.h
@@ -51,12 +51,30 @@ extern bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn);
extern unsigned long __init set_phys_range_identity(unsigned long pfn_s,
unsigned long pfn_e);

+#ifdef CONFIG_XEN_PV
extern int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
struct gnttab_map_grant_ref *kmap_ops,
struct page **pages, unsigned int count);
extern int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
struct gnttab_unmap_grant_ref *kunmap_ops,
struct page **pages, unsigned int count);
+#else
+static inline int
+set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
+ struct gnttab_map_grant_ref *kmap_ops,
+ struct page **pages, unsigned int count)
+{
+ return 0;
+}
+
+static inline int
+clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
+ struct gnttab_unmap_grant_ref *kunmap_ops,
+ struct page **pages, unsigned int count)
+{
+ return 0;
+}
+#endif

/*
* Helper functions to write or read unsigned long values to/from
@@ -72,6 +90,7 @@ static inline int xen_safe_read_ulong(unsigned long *addr, unsigned long *val)
return __get_user(*val, (unsigned long __user *)addr);
}

+#ifdef CONFIG_XEN_PV
/*
* When to use pfn_to_mfn(), __pfn_to_mfn() or get_phys_to_machine():
* - pfn_to_mfn() returns either INVALID_P2M_ENTRY or the mfn. No indicator
@@ -98,6 +117,12 @@ static inline unsigned long __pfn_to_mfn(unsigned long pfn)

return mfn;
}
+#else
+static inline unsigned long __pfn_to_mfn(unsigned long pfn)
+{
+ return pfn;
+}
+#endif

static inline unsigned long pfn_to_mfn(unsigned long pfn)
{
--
2.9.3
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