mm: drop all references of writable and SCAN_PAGE_RO

Now that all actionable outcomes from checking pte_write() are gone, drop
the related references.

Link: https://lkml.kernel.org/r/20250908075028.38431-3-dev.jain@arm.com
Signed-off-by: Dev Jain <dev.jain@arm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Kiryl Shutsemau <kas@kernel.org>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Zach O'Keefe <zokeefe@google.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <baohua@kernel.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Mariano Pache <npache@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 6 insertions, 13 deletions

diff --git a/include/trace/events/huge_memory.h b/include/trace/events/huge_memory.h
index 2305df6cb485..dd94d14a2427 100644
--- a/include/trace/events/huge_memory.h
+++ b/include/trace/events/huge_memory.h
@@ -19,7 +19,6 @@
 	EM( SCAN_PTE_NON_PRESENT,	"pte_non_present")		\
 	EM( SCAN_PTE_UFFD_WP,		"pte_uffd_wp")			\
 	EM( SCAN_PTE_MAPPED_HUGEPAGE,	"pte_mapped_hugepage")		\
-	EM( SCAN_PAGE_RO,		"no_writable_page")		\
 	EM( SCAN_LACK_REFERENCED_PAGE,	"lack_referenced_page")		\
 	EM( SCAN_PAGE_NULL,		"page_null")			\
 	EM( SCAN_SCAN_ABORT,		"scan_aborted")			\
@@ -55,15 +54,14 @@ SCAN_STATUS
 
 TRACE_EVENT(mm_khugepaged_scan_pmd,
 
-	TP_PROTO(struct mm_struct *mm, struct folio *folio, bool writable,
+	TP_PROTO(struct mm_struct *mm, struct folio *folio,
 		 int referenced, int none_or_zero, int status, int unmapped),
 
-	TP_ARGS(mm, folio, writable, referenced, none_or_zero, status, unmapped),
+	TP_ARGS(mm, folio, referenced, none_or_zero, status, unmapped),
 
 	TP_STRUCT__entry(
 		__field(struct mm_struct *, mm)
 		__field(unsigned long, pfn)
-		__field(bool, writable)
 		__field(int, referenced)
 		__field(int, none_or_zero)
 		__field(int, status)
@@ -73,17 +71,15 @@ TRACE_EVENT(mm_khugepaged_scan_pmd,
 	TP_fast_assign(
 		__entry->mm = mm;
 		__entry->pfn = folio ? folio_pfn(folio) : -1;
-		__entry->writable = writable;
 		__entry->referenced = referenced;
 		__entry->none_or_zero = none_or_zero;
 		__entry->status = status;
 		__entry->unmapped = unmapped;
 	),
 
-	TP_printk("mm=%p, scan_pfn=0x%lx, writable=%d, referenced=%d, none_or_zero=%d, status=%s, unmapped=%d",
+	TP_printk("mm=%p, scan_pfn=0x%lx, referenced=%d, none_or_zero=%d, status=%s, unmapped=%d",
 		__entry->mm,
 		__entry->pfn,
-		__entry->writable,
 		__entry->referenced,
 		__entry->none_or_zero,
 		__print_symbolic(__entry->status, SCAN_STATUS),
@@ -117,15 +113,14 @@ TRACE_EVENT(mm_collapse_huge_page,
 TRACE_EVENT(mm_collapse_huge_page_isolate,
 
 	TP_PROTO(struct folio *folio, int none_or_zero,
-		 int referenced, bool  writable, int status),
+		 int referenced, int status),
 
-	TP_ARGS(folio, none_or_zero, referenced, writable, status),
+	TP_ARGS(folio, none_or_zero, referenced, status),
 
 	TP_STRUCT__entry(
 		__field(unsigned long, pfn)
 		__field(int, none_or_zero)
 		__field(int, referenced)
-		__field(bool, writable)
 		__field(int, status)
 	),
 
@@ -133,15 +128,13 @@ TRACE_EVENT(mm_collapse_huge_page_isolate,
 		__entry->pfn = folio ? folio_pfn(folio) : -1;
 		__entry->none_or_zero = none_or_zero;
 		__entry->referenced = referenced;
-		__entry->writable = writable;
 		__entry->status = status;
 	),
 
-	TP_printk("scan_pfn=0x%lx, none_or_zero=%d, referenced=%d, writable=%d, status=%s",
+	TP_printk("scan_pfn=0x%lx, none_or_zero=%d, referenced=%d, status=%s",
 		__entry->pfn,
 		__entry->none_or_zero,
 		__entry->referenced,
-		__entry->writable,
 		__print_symbolic(__entry->status, SCAN_STATUS))
 );