x86/p2m: drop redundant macro definitions

Also, add log level indicator to P2M_ERROR(), and drop pointless
underscores from all related macros' parameter names.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -46,18 +46,6 @@ boolean_param("hap_1gb", opt_hap_1gb);
 bool_t __read_mostly opt_hap_2mb = 1;
 boolean_param("hap_2mb", opt_hap_2mb);
 
-/* Printouts */
-#define P2M_PRINTK(_f, _a...)                                \
-    debugtrace_printk("p2m: %s(): " _f, __func__, ##_a)
-#define P2M_ERROR(_f, _a...)                                 \
-    printk("pg error: %s(): " _f, __func__, ##_a)
-#if P2M_DEBUGGING
-#define P2M_DEBUG(_f, _a...)                                 \
-    debugtrace_printk("p2mdebug: %s(): " _f, __func__, ##_a)
-#else
-#define P2M_DEBUG(_f, _a...) do { (void)(_f); } while(0)
-#endif
-
 
 /* Override macros from asm/page.h to make them work with mfn_t */
 #undef mfn_to_page
--- a/xen/include/asm-x86/p2m.h
+++ b/xen/include/asm-x86/p2m.h
@@ -607,15 +607,15 @@ extern void audit_p2m(struct domain *d,
 #endif /* P2M_AUDIT */
 
 /* Printouts */
-#define P2M_PRINTK(_f, _a...)                                \
-    debugtrace_printk("p2m: %s(): " _f, __func__, ##_a)
-#define P2M_ERROR(_f, _a...)                                 \
-    printk("pg error: %s(): " _f, __func__, ##_a)
+#define P2M_PRINTK(f, a...)                                \
+    debugtrace_printk("p2m: %s(): " f, __func__, ##a)
+#define P2M_ERROR(f, a...)                                 \
+    printk(XENLOG_G_ERR "pg error: %s(): " f, __func__, ##a)
 #if P2M_DEBUGGING
-#define P2M_DEBUG(_f, _a...)                                 \
-    debugtrace_printk("p2mdebug: %s(): " _f, __func__, ##_a)
+#define P2M_DEBUG(f, a...)                                 \
+    debugtrace_printk("p2mdebug: %s(): " f, __func__, ##a)
 #else
-#define P2M_DEBUG(_f, _a...) do { (void)(_f); } while(0)
+#define P2M_DEBUG(f, a...) do { (void)(f); } while(0)
 #endif
 
 /* Called by p2m code when demand-populating a PoD page */