powerpc/mm/trace: convert trace event to trace event class

A follow-up patch will add a pud variant for this same event.  Using event
class makes that addition simpler.

No functional change in this patch.

Link: https://lkml.kernel.org/r/20230724190759.483013-9-aneesh.kumar@linux.ibm.comSigned-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Joao Martins <joao.m.martins@oracle.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

arch/powerpc/mm/book3s64/hash_pgtable.c

@@ -214,7 +214,7 @@ unsigned long hash__pmd_hugepage_update(struct mm_struct *mm, unsigned long addr
 
 	old = be64_to_cpu(old_be);
 
-	trace_hugepage_update(addr, old, clr, set);
+	trace_hugepage_update_pmd(addr, old, clr, set);
 	if (old & H_PAGE_HASHPTE)
 		hpte_do_hugepage_flush(mm, addr, pmdp, old);
 	return old;

arch/powerpc/mm/book3s64/radix_pgtable.c

@@ -962,7 +962,7 @@ unsigned long radix__pmd_hugepage_update(struct mm_struct *mm, unsigned long add
 #endif
 
 	old = radix__pte_update(mm, addr, pmdp_ptep(pmdp), clr, set, 1);
-	trace_hugepage_update(addr, old, clr, set);
+	trace_hugepage_update_pmd(addr, old, clr, set);
 
 	return old;
 }

include/trace/events/thp.h

@@ -8,25 +8,29 @@
 #include <linux/types.h>
 #include <linux/tracepoint.h>
 
-TRACE_EVENT(hugepage_set_pmd,
+DECLARE_EVENT_CLASS(hugepage_set,
 
-	    TP_PROTO(unsigned long addr, unsigned long pmd),
-	    TP_ARGS(addr, pmd),
+	    TP_PROTO(unsigned long addr, unsigned long pte),
+	    TP_ARGS(addr, pte),
 	    TP_STRUCT__entry(
 		    __field(unsigned long, addr)
-		    __field(unsigned long, pmd)
+		    __field(unsigned long, pte)
 		    ),
 
 	    TP_fast_assign(
 		    __entry->addr = addr;
-		    __entry->pmd = pmd;
+		    __entry->pte = pte;
 		    ),
 
-	    TP_printk("Set pmd with 0x%lx with 0x%lx", __entry->addr, __entry->pmd)
+	    TP_printk("Set page table entry with 0x%lx with 0x%lx", __entry->addr, __entry->pte)
 );
 
+DEFINE_EVENT(hugepage_set, hugepage_set_pmd,
+	    TP_PROTO(unsigned long addr, unsigned long pmd),
+	    TP_ARGS(addr, pmd)
+);
 
-TRACE_EVENT(hugepage_update,
+DECLARE_EVENT_CLASS(hugepage_update,
 
 	    TP_PROTO(unsigned long addr, unsigned long pte, unsigned long clr, unsigned long set),
 	    TP_ARGS(addr, pte, clr, set),
@@ -48,6 +52,11 @@ TRACE_EVENT(hugepage_update,
 	    TP_printk("hugepage update at addr 0x%lx and pte = 0x%lx clr = 0x%lx, set = 0x%lx", __entry->addr, __entry->pte, __entry->clr, __entry->set)
 );
 
+DEFINE_EVENT(hugepage_update, hugepage_update_pmd,
+	    TP_PROTO(unsigned long addr, unsigned long pmd, unsigned long clr, unsigned long set),
+	    TP_ARGS(addr, pmd, clr, set)
+);
+
 DECLARE_EVENT_CLASS(migration_pmd,
 
 		TP_PROTO(unsigned long addr, unsigned long pmd),