tracing/xen: Hide events that are not used when X86_PAE is not defined

TRACE_EVENTS() take up memory. If they are defined but not used, then
they simply waste space. If their use case is behind a define, then the
trace events should be as well.

The trace events xen_mmu_set_pte_atomic, xen_mmu_pte_clear, and
xen_mmu_pmd_clear are not used when CONFIG_X86_PAE is not defined.

Link: http://lkml.kernel.org/r/20171010191256.3d6d72cb@gandalf.local.home
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Jeremy Linton <jeremy.linton@arm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/include/trace/events/xen.h b/include/trace/events/xen.h
index 1b4fed72f573800c0839eedc4aaa1ca642a2ada0..6118d82334ec3af2e0a388ffbb28463bd0e334a4 100644 (file)
--- a/include/trace/events/xen.h
+++ b/include/trace/events/xen.h
@@ -147,7 +147,6 @@ DECLARE_EVENT_CLASS(xen_mmu__set_pte,
                     TP_ARGS(ptep, pteval))
 
 DEFINE_XEN_MMU_SET_PTE(xen_mmu_set_pte);
-DEFINE_XEN_MMU_SET_PTE(xen_mmu_set_pte_atomic);
 
 TRACE_EVENT(xen_mmu_set_pte_at,
            TP_PROTO(struct mm_struct *mm, unsigned long addr,
@@ -169,21 +168,6 @@ TRACE_EVENT(xen_mmu_set_pte_at,
                      (int)sizeof(pteval_t) * 2, (unsigned long long)__entry->pteval)
        );
 
-TRACE_EVENT(xen_mmu_pte_clear,
-           TP_PROTO(struct mm_struct *mm, unsigned long addr, pte_t *ptep),
-           TP_ARGS(mm, addr, ptep),
-           TP_STRUCT__entry(
-                   __field(struct mm_struct *, mm)
-                   __field(unsigned long, addr)
-                   __field(pte_t *, ptep)
-                   ),
-           TP_fast_assign(__entry->mm = mm;
-                          __entry->addr = addr;
-                          __entry->ptep = ptep),
-           TP_printk("mm %p addr %lx ptep %p",
-                     __entry->mm, __entry->addr, __entry->ptep)
-       );
-
 TRACE_DEFINE_SIZEOF(pmdval_t);
 
 TRACE_EVENT(xen_mmu_set_pmd,
@@ -201,6 +185,24 @@ TRACE_EVENT(xen_mmu_set_pmd,
                      (int)sizeof(pmdval_t) * 2, (unsigned long long)__entry->pmdval)
        );
 
+#ifdef CONFIG_X86_PAE
+DEFINE_XEN_MMU_SET_PTE(xen_mmu_set_pte_atomic);
+
+TRACE_EVENT(xen_mmu_pte_clear,
+           TP_PROTO(struct mm_struct *mm, unsigned long addr, pte_t *ptep),
+           TP_ARGS(mm, addr, ptep),
+           TP_STRUCT__entry(
+                   __field(struct mm_struct *, mm)
+                   __field(unsigned long, addr)
+                   __field(pte_t *, ptep)
+                   ),
+           TP_fast_assign(__entry->mm = mm;
+                          __entry->addr = addr;
+                          __entry->ptep = ptep),
+           TP_printk("mm %p addr %lx ptep %p",
+                     __entry->mm, __entry->addr, __entry->ptep)
+       );
+
 TRACE_EVENT(xen_mmu_pmd_clear,
            TP_PROTO(pmd_t *pmdp),
            TP_ARGS(pmdp),
@@ -210,6 +212,7 @@ TRACE_EVENT(xen_mmu_pmd_clear,
            TP_fast_assign(__entry->pmdp = pmdp),
            TP_printk("pmdp %p", __entry->pmdp)
        );
+#endif
 
 #if CONFIG_PGTABLE_LEVELS >= 4