Hide the internals of vm_page_lock(9) from the loadable modules.

Since the address of vm_page lock mutex depends on the kernel options,
it is easy for module to get out of sync with the kernel.

No vm_page_lockptr() accessor is provided for modules. It can be added
later if needed, unless proper KPI is developed to serve the needs.

Reviewed by:	attilio, alc
MFC after:	3 weeks

2 files changed, 49 insertions, 0 deletions

diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
index d592ac0..fcf25a3 100644
--- a/sys/vm/vm_page.c
+++ b/sys/vm/vm_page.c
@@ -2843,6 +2843,36 @@ vm_page_test_dirty(vm_page_t m)
 		vm_page_dirty(m);
 }
 
+void
+vm_page_lock_KBI(vm_page_t m, const char *file, int line)
+{
+
+	mtx_lock_flags_(vm_page_lockptr(m), 0, file, line);
+}
+
+void
+vm_page_unlock_KBI(vm_page_t m, const char *file, int line)
+{
+
+	mtx_unlock_flags_(vm_page_lockptr(m), 0, file, line);
+}
+
+int
+vm_page_trylock_KBI(vm_page_t m, const char *file, int line)
+{
+
+	return (mtx_trylock_flags_(vm_page_lockptr(m), 0, file, line));
+}
+
+#if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
+void
+vm_page_lock_assert_KBI(vm_page_t m, int a, const char *file, int line)
+{
+
+	mtx_assert_(vm_page_lockptr(m), a, file, line);
+}
+#endif
+
 int so_zerocp_fullpage = 0;
 
 /*
diff --git a/sys/vm/vm_page.h b/sys/vm/vm_page.h
index 151710d..15af489 100644
--- a/sys/vm/vm_page.h
+++ b/sys/vm/vm_page.h
@@ -218,11 +218,23 @@ extern struct vpglocks pa_lock[];
 
 #define	PA_LOCK_ASSERT(pa, a)	mtx_assert(PA_LOCKPTR(pa), (a))
 
+#ifdef KLD_MODULE
+#define	vm_page_lock(m)		vm_page_lock_KBI((m), LOCK_FILE, LOCK_LINE)
+#define	vm_page_unlock(m)	vm_page_unlock_KBI((m), LOCK_FILE, LOCK_LINE)
+#define	vm_page_trylock(m)	vm_page_trylock_KBI((m), LOCK_FILE, LOCK_LINE)
+#if defined(INVARIANTS)
+#define	vm_page_lock_assert(m, a)		\
+    vm_page_lock_assert_KBI((m), (a), __FILE__, __LINE__)
+#else
+#define	vm_page_lock_assert(m, a)
+#endif
+#else	/* !KLD_MODULE */
 #define	vm_page_lockptr(m)	(PA_LOCKPTR(VM_PAGE_TO_PHYS((m))))
 #define	vm_page_lock(m)		mtx_lock(vm_page_lockptr((m)))
 #define	vm_page_unlock(m)	mtx_unlock(vm_page_lockptr((m)))
 #define	vm_page_trylock(m)	mtx_trylock(vm_page_lockptr((m)))
 #define	vm_page_lock_assert(m, a)	mtx_assert(vm_page_lockptr((m)), (a))
+#endif
 
 #define	vm_page_queue_free_mtx	vm_page_queue_free_lock.data
 /*
@@ -405,6 +417,13 @@ void vm_page_cowfault (vm_page_t);
 int vm_page_cowsetup(vm_page_t);
 void vm_page_cowclear (vm_page_t);
 
+void vm_page_lock_KBI(vm_page_t m, const char *file, int line);
+void vm_page_unlock_KBI(vm_page_t m, const char *file, int line);
+int vm_page_trylock_KBI(vm_page_t m, const char *file, int line);
+#if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
+void vm_page_lock_assert_KBI(vm_page_t m, int a, const char *file, int line);
+#endif
+
 #ifdef INVARIANTS
 void vm_page_object_lock_assert(vm_page_t m);
 #define	VM_PAGE_OBJECT_LOCK_ASSERT(m)	vm_page_object_lock_assert(m)